Gcc clang msvc. Using GCC with MinGW. CMake zlib build on Windows. 8) project(my) add_executable(my main. Linking. GCC appears to preserve const-ness when deducing the type of an NTTP, while Clang and MSVC do not. Clangs But explaining in detail how to write such a plugin is maybe a bit much. An intriguing question posted in a programming forum highlighted this very dilemma, specifically why std::max() compiles in Microsoft's MSVC but I'm not sure how much flexibility (if any) you have with the compiler you are using, but if you have access to clang-cl that would probably be better than gcc in terms of MSVC operability -- since that's the clang front-end plugged into MSVC's standard library and codegen, which pretty much guarantees compatibility. dll: msvcrt. I want to know which compiler is correct here as per the C++17 standard. Provide details and share your research! But avoid . gcc and g++ are the traditional GNU compilers for C and C++ code. txt in Solution Explorer and choose CMake settings for project. C99 introduces __func__, and GCC has provided __FUNCTION__ for a long time. EDIT: std::print is now available on all 3 major compilers. All you have to do With GCC and clang, my code will be auto-vectorized if I compile with :-O2 -ftree-vectorize -march=XYZ (XYZ being the target instruction set: native, SSE, AVX2, etc. b) Linux -> Use clang or gcc, there is not much of a difference I'd say, gcc is a bit more advanced in terms of language support, but clang It is possible have code that works everywhere, and emits custom warnings on many compilers, including most compilers people are likely to use (GCC, clang, MSVC, Intel, ). These include accepted revisions to the standard, as well as various technical specifications: We use GCC. 0: 84: February 17, 2021 Adding sanity to the Atomics The above program works with msvc but not with gcc and clang. Is it possible to trick MSVC into producing better assembly? I've looked at Compiler Explorer but my experiments haven't made much This is a problem with MSVC. Once you have installed Clang, using it with CMake projects is easy. GCC Clang MSVC Apple Clang In general the takeaway is __m128 is a builtin type on clang while a class type on MSVC. Demo template<int x> struct X { consteval static int get(); int f() const; }; //compiles with msvc but not There's MSVC, Clang, and GCC, yes, but there's also the Intel compiler, the PGI compiler, and so on. #ifdef _MSC_VER //. 0 (2015)* Yes 17. MSVC and GNU C are separate flavours of C. Does Visual Studio offer a similar feature? You will see that clang and gcc reject this conversion, whereas MSVC accepts it. Or in some cases, no instructions (e. Tools ¶ A complete compilation of C family programming languages typically involves the following pipeline of tools, some of which are omitted in some Bug Fixes and Cross-Compilation: MSVC poses challenges for fixing certain bugs, especially on ARM. , DR20 → C++20. exe Two-step compile & link: clang++ -c main. The MSVC Toolchain can be obtained either by already having Visual Studio installed or by installing the Visual Studio Build Tools. E is potentially evaluated or C is X or GCC libstdc++. Also you should be aware of the x32 Create a new configuration. Follow edited Nov 26, 2020 at 5:31. IBM Open XL C++ for AIX. If an id-expression E denotes a non-static non-type member of some class C at a point where the current class ([expr. I timed the FFT function. LLVM code The other approach is a practical one. Furthermore, there will be a I had the same problem trying to move to C++20 and the _MSVC_LANG kept on being 201703 (leading to _HAS_CXX20 being 0). How to use zlib library in visual studio 2017? 0. Follow edited Nov 30, 2023 at 23:43. MSVC: Missing Wconversion warning in template function with std::invoke. Thus the performance of the AWS/Linux system and the macbook is somewhat comparable. Does anyone know how to distinguish if my code is currently compiled by clang-cl or msvc's cl? Without passing any extra defined macros on command line. Clang. where meson-native-clang is the native file: [binaries] c = ' C:\Users\me\scoop\apps\llvm\current\bin\clang. On second look it does the same on GCC, but it optimizes the rest of the function. exe - the MSVC C/C++ compiler - is available (e. You can use a combination of the AMD64 and Intel x86 macros listed on that page. 0 5. These days you should normally just include <immintrin. These default to the values of 1800 and 180000000 respectively, making clang look like an early release of Visual C++ 2013. Is it possible to trick MSVC into producing better assembly? I've looked at Compiler Explorer but my experiments haven't made much Clang vs GCC vs MSVC - which one is correct? - Clang - missing C++20 - feature - lambda expression in an unevaluated operand - GCC: error: types may not be defined in 'decltype' expressions - MSVC: okay godbolt. This is explained in [over. ASM for human beings. Let us switch back to Windows and build Neither GCC nor Clang is a linker, and ICF needs to be done by the linker, or at least with cooperation with the linker. Violet Giraffe Violet Giraffe. with -march=native or -mavx2 -mbmi2 -mpopcnt -mfma -mcx16 -mtune=znver1 or whatever. As of 2020-11-20, the latest release of Oracle Developer Studio is 12. Embarcadero C++ Builder. A lambda-expression whose smallest enclosing scope is a block scope (6. On msvc it took 70~110 ms per run. My naive benchmark shows clang's executable run time is about 10% of the MSVC's runtime. While that sounded crazy, I gave it a try and it actually Passing -fno-diagnostics-show-option will prevent Clang from printing the [-Wextra-tokens] information in the diagnostic. Ensure that Neovim is launched in an environment where cl. Example: Const NTTPs A statically-initialized empty string in gcc consists of a pointer to the internal buffer, a constant 0 (size), and a bunch of zeroes (buf). They're more similar than Clang is to MSVC in my experience, and I suspect you'd have fewer issues trying to switch between them if you get your project to build with one. GCC didn't recognize the second error, and the "expected ';' before 'return'" errors from MSVC and GCC are like saying that to climb a tree, I must put the tree below me. On Linux your main options are GCC and Clang. msvc通常用于编译Windows应用，而gcc/clang则可以用来编译Windows/Linux/MacOS等所有平台的应用。 I was wondering what is the current state of affairs for MSVC vs Clang or MinGW at the moment? However, the MSVC version ends up taking advantage of a feature called "micro-op fusion". 7 compatibility. I want to know which compiler is right here. )) is fully supported by clang and that is a carryover from support in gcc for this Microsoft language feature. using Clang in windows 10 for C/C++. I'm currently using GCC, but I discovered Clang recently and I'm pondering switching. GCC says: Both GCC and MSVC compile it. It can strongly affect code generation for such a things like math calculations For better performance, we instruct Clang to use the Polly loop optimizer and the native lld linker. The program is ill-formed, no diagnostic required, if:. The program is well-formed as explained below and currently msvc only partially support P0847R7. Considering the non-derived case ("Foo") where all compilers agree to call the templated On Windows, Clang is not self-sufficient, and is supposed to be used in combination with an other compiler: either MinGW (GCC) or MSVC. I helped debug and promote the correct clang implementation. Visual Studio 2019 includes out of the box support for editing, building, and debugging CMake projects with Clang/LLVM. 3) is a local lambda expression; any other lambda-expression shall not have a capture-default or simple-capture in its lambda-introducer. New Most modern std::string implementations 1 save very small strings directly on the stack in a statically sized char array instead of using dynamic heap storage. prim. A compatible STL wasn't The issue is things like vtable layout. I tested it on godbolt with different version of GCC and MSVC 17(local) and 19. Using. Developer PowerShell/Command Prompt for VS 2022), and that the architecture of cl. 1 (According to the docs it's been available since 3. From [expr. 19. Unfortunatly there is no way to force a maximum size (at least not without compiler specific extensions). Improve this question. A complete compilation of C family programming languages typically MGLはC++17準拠ですので、このバージョンの仕様に準ずるなら定数式内では非定数式の関数を呼び出すことはできないはずです。しかし、先述の通りMSVCやClangはこれを The header to include to get the symbol is <boost/predef. Clang is fairly strictly conforming to the two-phase name lookup. Personally I like GCC and Clang/LLVM more because of better portability for Linux or MacOS for example, and that I personally think that both GCC and Clang/LLVM give better diagnostic messages about What are the chances of getting something like GCC’s __builtin_expect (aka likely/`unlikely)? The argument for not implementing this feature is that it is non-standard. Back in 2001 I wrote up the GCC extension for standardization (and the related extension that lets you use a name other than __VA_ARGS__ for the rest-parameter) in document N976 , but that received no response whatsoever from the committee; I don't even know if anyone read it. Cray. Demo #include &lt; Intrinsics aren't supposed to be function calls, they're supposed to inline to one or a couple instructions. Clang doesn't compile code but gcc and msvc compiled it. Clang uses LLVM in the backend. Fehler und Warnungen werden im Ausgabefenster angezeigt. A search for "C++98" on MSDN doesn't turn up anything. 8. Visual Studio will use the MSVC compiler by default on Windows. Removing these lines from the file worked. Apple Clang* IBM Open XL C/C++ for AIX* Sun/Oracle C++* Embarcadero C++ Builder* Regular expressions library: N1429: 4. Both of these are strings containing the name of the current function (there are slight semantic A slightly portable solution that works for the big 3 main compiler front-ends (gcc, clang, and msvc) would be to use a function template and extract the type name from the function name. Ah - I see you put clang first, thus avoiding the issue of clang enabling GNUC nice – Goblinhack. Any Clang options that Zig is not aware of are forwarded to Clang directly. For a better Rust experience inside VS Code it is recommended to install the rust-analyzer extension Online from the VS Code Marketplace, or instead of it, the Rust plugin from [Link1] below, at the bottom of the post. org Open. I think the reason of the difference between gcc and msvc is that compilers optimize unit_val() differently. Commented Dec 8, 2021 at 21:09. 7. Most video codecs with hand-written assembly (like x264 / x265) do runtime dispatching based on CPU Both GCC and MSVC compile it. Since CWG 903 is considered a defect, I'd argue that clang and gcc are right. object]/2. Share. Platform defaults: Neither GCC nor Clang is a linker, and ICF needs to be done by the linker, or at least with cooperation with the linker. This should, theoretically, trigger a I simply assume that Clang mirrors GCC's dialect options (for example, C++03 is valid on Clang), although without proof I cannot state so conclusively. 0. Once a build tree is generated with a given compiler, you cannot switch the compiler for that build tree. (2) No-one has felt strongly enough about switching to clang to put forth the argument for switching. From temp#res. Additional context. zig creating a C library . But thanks for your comments. It's hard to say why one compiler would be better than the others. DRnn - the number nn after "DR" denotes target C++ revision the Defect Report is applied to, e. Edit: They don't do ICF, so yes, distinct instantiations produce distinct code. What is the correct behavior. Sun/Oracle C++. IBM XL C++. Intel C++. This blog post will delve into the specifics of this issue Bug Fixes and Cross-Compilation: MSVC poses challenges for fixing certain bugs, especially on ARM. At -O3, vectorization instructions are used (at -O2, they are not used). exe Option 2: Link to libstdc++ using gcc / g++. However, C++ ABIs are particularly large and complicated, and Clang’s support for MSVC’s C++ ABI is a work in progress. MSVC defines _DEBUG in debug mode, gcc defines NDEBUG in release mode. 6. GCC is between the two and is typically about 25% of MSVC. 0. Clang and G++ should be interoperable if you set the right settings, and Clang and MSVC may be interoperable depending on which exact features you use. Commented Aug 11, 2011 at 22:07. Demo template<int x> struct X { consteval static int get(); int f() const; }; //compiles with msvc but not Nowadays, I have read the source code of LLVM and I know LLVM has implemented MSVC-style name mangling for C++ functions. cpp -o main. The compiler just checks the condition and calls abort. Cygwin Clang I've written the following program that uses requires without parentheses. NET，但无论微软玩的是什么。 I often build C (and C++) code, using GCC (or clang) with the -Wall flag turned on. There is one deciding factor though - quality (speed, memory footprint, reliability) of binaries it produces - if gcc -O3can produce a binary that runs 1% faster, or Clang binaries take up more memory or just fail due to compiler bugs, it's a deal-breaker. There are some other interesting compiler flags for developers. 1 Preview 2 comes with support for Clang/LLVM out-of-the-box. *hover over a cell marked with the star * to see additional pop-up notes. What does the actual output in Visual Studio look like? Regardless, MSVC will compile that successfully. From direct initialization: T object ( arg ); (1) The effects of direct meson build-gcc CC=clang CXX=clang++ meson build-clang While dcbaker's solution will work on linux, it won't on windows. This can lead to different behavior when using const NTTPs in templates. Viewed 134 times 3 I'm encountering an issue where a template function uses std::invoke to call another function, passing a size_t argument to a parameter expecting an int32_t. A GCC style weak symbol would let me do that, but I don't know if it can be done with visual studio. All you have to do The question was how to use it with mingw-w64 headers, not how to build for different architecture. Round 2: The Missing Brace -> use MSVC in Visual studio (I'd prefer that since its language support is the most advanced, it is integrated, follows standards and is a bit less aggressive) or MinGW if you really want gcc experience. By default, MSVC doesn't do this optimization so that code it compiles can be ABI compatible with older versions of the compiler. ; Cray compiler may have support for some features earlier than 11. 2 call the copy constructor of Foo while MSVC v19. But I want to use expression block language extensions as well, which is GCC 11: 1 min* WSL (Microsoft Laptop) Intel Rocket Lake processor: LLVM 14: 1 min* On Intel processors, we build multiple kernels to support the various families of processors. If not set or if set to ${default}, the extension will choose the default for that platform. It is possible to use gcc's linker Any GCC, Clang, MSVC or Cuda NVCC compiler; Make sure that your GCC/Clang compiler is either in your PATH or you have to manually set the C/C++ Compiler setting of this extension. 14. GCC is nearly standard in Linux world, and it adds a lot of non-standard features which are widely used in Linux software. Errors and warnings are MSVC does not require you to specify the C++ standard. Compiling with clang-cl works, but linking fails to find basic libc symbols. dll: Depends on the same stdlib as MinGW gcc compiler, can actually use libstdc++ and libstdc++11 variants. There are too many compiler variants. One step compile & link: clang++ main. 4: 85: September 25, 2011 RFC: __atomic_* support for gcc 4. 2. To add a new Clang configuration to a CMake project: Right-click on CMakeLists. Share GCC and clang emit equivalent and correct assembly, neither is superior to the other. Then I wrote the following program that compiles with msvc but both clang and gcc fails to compile this. C0000 is not actually a valid warning message number in MSVC. with unsigned wrapping so the answer is probably always zero) but gcc and clang happen not to. 11. I use it all the time in clang; it is fabulous for encapsulation and refactoring. Modified 7 months ago. Visual C++与Visual Studio的版本对应关系 _MSC_VER: 是MSVC编译器内置的宏定义，可以在源代码中直接引用 Clang without GCC or MSVC. cigien. The GNU gold linker supports ICF with the --icf option, which needs the GCC option -ffunction-sections to be used. MSVC /arch is that if you use explicit intrinsics, Clang really wants you to specify a high-enough -march to make it valid. Under Configurations, press the Add Configuration button:. For each conversion function to a function pointer of the class, a so-called surrogate call function is added to overload resolution, which if chosen would first convert the object via this operator overload to a function pointer and then call the function via the function pointer. e. C++11 introduced a standardized way to do this, but since this is C you'll have to settle for a more simple method of making the last enum INT_MAX or a value thats large enough so that only the type you want can hold it (this is what the DirectX SDK does). # Note that we're using the full target triple for each variable instead of the # simple CC/CXX/AR shorthands to avoid issues when compiling any C/C++ code for # build dependencies that need to compile and execute in the host environment ENV CC_x86_64_pc_windows_msvc="clang-cl" \ CXX_x86_64_pc_windows_msvc="clang-cl" \ GCC Clang MSVC; Parenthesized initialization of aggregates: P0960R: 10: 19. Clang libc++. However, if I run MSVC with -Wall, I get many warnings which I find rather spurious, such as: Visual Studio 2019 version 16. It includes everything. gcc and clang both offer __PRETTY_FUNCTION__ which is the name of a current function or function template with all type-argument in the string. Most of those lines are separate functions; MSVC's definition of main itself is 7 instructions vs. – Clang Frontend. As you say the latest release targets msvc by default and that was my problem at that time. But yes, int3 is a good idea; that's how 0xCC disassembles, and it's a more accurate representation of what you want. . MSVC compiles and executes fine. Describe alternatives you've Yes, See this link. EDG eccp. 5k 52 52 gold badges 203 203 silver badges 352 352 clang does not support the Microsoft extension where anonymous record members can be declared using user defined typedefs. general:. And, on compilers which aren't known to work, the macros will be preprocessed away to nothing, so your code will continue to work with any These days there are few differences between compilers (MSVC, GCC, Clang/LLVM). But unlike GCC, MSVC lets you use intrinsics without needing to compile with any -march=haswell equivalent to "promise" that you'll only run the binary on CPUs that support some instruction-set extensions. 1. For Cuda code the NVCC Compiler will be automatically called. 0* (partial)* 19. Just an FFT function would be called nearly 500 times per execution. Painless code migration from MSVC, Borland __asm {} intel syntax style to LLVM, GCC("asm"). Debug your Linux applications as they run remotely with GDB. When targeting Windows with the MSVC-compatible clang-cl driver, some of the details are different. Enable printing category information in diagnostic line. ) In the case of GCC / clang, it's simply using the supported pragma for displaying a warning message using _Pragma() instead of #pragma or #warning. For compatibility with existing code that compiles with MSVC, clang defines the _MSC_VER and _MSC_FULL_VER macros. 1. 10: 201: September 13, 2017 Questions about Clang __atomic and __sync builtins? Clang Frontend. The presence of a pointer introduces a relocation into the data segment and silently messes up string’s constexpr-ness. MSVC is pushing to implement standards features, not extend the language in ways that # Note that we're using the full target triple for each variable instead of the # simple CC/CXX/AR shorthands to avoid issues when compiling any C/C++ code for # build dependencies that need to compile and execute in the host environment ENV CC_x86_64_pc_windows_msvc="clang-cl" \ CXX_x86_64_pc_windows_msvc="clang-cl" \ Visual Studio 2019 version 16. Will disable the warning about calling a deprecated function on GCC, Clang, ICC, PGI, MSVC, TI, IAR, ODS, Pelles C, and possibly others (I probably won't bother updating this answer as I update Hedley). 1 sdk by adding at to the end of the commandline-parameter like this; "%comspec% /k ""C:\Program . I've tried it with cmake 3. Distinct functions must have distinct addresses The MSVC Toolchain can be obtained either by already having Visual Studio installed or by installing the Visual Studio Build Tools. txt have to be defined with the suffix Take advantage of powerful coding and debugging tools to manage code targeting Linux built with GCC, Clang, or another compiler. But you almost certainly shouldn't. vcxproj file had a language standard 'condition' still being stdcpp17 (while the language standard was correctly at stdcpp20). Look at e. It's non-challenging to create API bindings. @2016 - stasinek/stasm The Mystery of std::max: Why Your Code Compiles Differently Across Compilers. Here is a link with more information: In the ever-evolving landscape of C++, keeping up with the changes introduced in the newest standards can sometimes lead to perplexing compilation issues. Share Sort by: Best. What are the deviations between preprocessors of GCC/CLANG vs MSVC? Ask Question Asked 5 years, 11 months ago. Now I happen to need to make sure a small C project, which builds fine on Linux with this flag, also builds on Windows with MSVC. The program compiles with msvc but not with gcc and clang. Most importantly Compiler Explorer is an interactive online compiler which shows the assembly output of compiled C++, Rust, Go (and many more) code. Distinct functions must have distinct addresses Of course, we can also manually switch to gcc to build. The meanings of warning FYI on macos, clang defines the gcc flag, so you need to do some extra logic like: #if GNUC #ifndef clang #pragma GCC diagnostic warning "-Wclass-memaccess" #endif #endif – Goblinhack. Open comment sort options. I've written the following program that compiles with msvc but not with gcc and clang. When I compile a large project (for example, Bitcoin) in both GCC (using MinGW) and in MSVC (using Visual Studio) using comparable optimization settings, the GCC binary is 6 mb and the MSVC binary is 4 mb. For example, -O3 (for GCC and Clang) and /Ox (for MSVC), for example, generate a maximum optimized program, The Clang docs discuss the unwanted MS behavior, but they don't say how to stop it:. If the user additionally installs a specific version of the gcc tool chain such as gcc-11, gcc-10, the local gcc program may be named /usr/bin/gcc-11. I am trying to get decent performance out of MSVC for this code. Perhaps gcc implements something similar - we will see. On a 64-bit ARM processor, we only build one kernel. I'm sure nobody would argue that auto-vectorization is as important as scalar optimizations Making MSVC compiler GCC complient? 0. 8 ? Yes 17. 28 (16. So either gcc or clang. cc) If from GCC or Clang compiler change to MSVC in compiler editor automatic replace compiler options to its alternative in MSVC compiler, for example: replace -O2 to /O2, -Wall to /Wall , -std=c++20 to /std:c++20. GCC 11: 1 min* WSL (Microsoft Laptop) Intel Rocket Lake processor: LLVM 14: 1 min* On Intel processors, we build multiple kernels to support the various families of processors. But explaining in detail how to write such a plugin is maybe a bit much. capture]/3 (C++17 draft N4659). MSVC 2015 on the other hand ignores the static_assert. Reason: status for Apple Clang and other compilers supporting C2x : C23 feature Paper(s) GCC. On gcc, execution time came down to 10 ms without compiler optimization and with O3 flag, per run came down to <5ms. Passing -fno-diagnostics-show-option will prevent Clang from printing the [-Wextra-tokens] information in the diagnostic. It uses the older msvcrt. There are too many compiler versions. 13 Yes Member functions cbegin, cend, crbegin, and crend To switch between gcc and clang, you should have two completely separate build trees, and simply cd back and forth to "switch" compilers. o clang++ main. Commented Jul 31, 2022 at 10:04. If [] I would like to add that the __FUNCTION__ macro is defined for both GCC and MSVC. Nana Noe Nana Noe. 59. If you want to go that route, install Microsoft Visual Studio. $ xmake f --toolchain=gcc -c $ xmake Use the specified version of Gcc. Instead of aiming for 100% portable code, you aim for portability on a set of versions of compilers on a set of architectures. gcc: 10 msvc: 0. I am using C++17. It allows implementations to avoid heap allocations for small string objects and improves locality of reference. Update 2021-02-17: please check the newest status of GCC & Clang, and MSVC. GCC also contains support for this feature, however where MSVC and GCC are incompatible clang follows the MSVC definition. MSVC and ICC will let you use intrinsics without enabling anything at compile time, Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company There is CLang-CL which is a drop-in replacement for MSVC's CL. dll, which comes in older WindowsAlso binary incompatible with msvc. __declspec(property(get=. MSVC(Microsoft Visual C++)由微软开发，主要用于Windows平台应用程序的开发。 Visual Studio系列IDE默认集成了该编译器，可以通过下载安装Visual Studio安装包来安装。 MSVC只能在Windows下用，不支持跨平台。 1. In our last release, we announced support for Clang/LLVM for CMake. answered Then I wrote the following program that compiles with msvc but both clang and gcc fails to compile this. Of course, we can also manually switch to gcc to build. A toolchain or a policy. The meanings of warning I see at least in the current clang trunk that there is some notable progress to improve compile times in combination with templates and precompiled headers / modules. 8* 5 3. 3. Gcc says error: struct Outer<int>::Inner is private within this context. It was highly optimized. Otherwise this is also a good solution. However, I read somewhere that gcc could generate static libraries that were binary compatible with MSVC compilers, as long as the binary interface remains in C. id:. 10/VS 2019 all have the based std::format available in respective standard libraries. MSVC. Demo #include &lt; I'd like to use clang without GCC on Linux and without MSVC on Windows. GCC says: The program is ill-formed no diagnostic required since you're not using the ill-formed deduction guide. What macro can I use in clang to detect whether the code is being compiled for release or debug? c++; debugging ; clang; Share. IBM Open XL C++ for z/OS. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I've written the following program that compiles with msvc but not with gcc and clang. 33. Apple Clang. If you don’t require MSVC ABI compatibility or don’t want to use Microsoft’s C and C++ runtimes, the mingw32 I am learning about user defined literals and I wrote the following program that works with gcc and msvc but clang rejects it. GCC has the ability to make a symbol link weakly via __attribute__((weak)). 0 Type traits: N1836 * N2240 N2244 N2255 N2342 N2984 N3142: 4. Modules support is pretty buggy in clang and gcc (I haven't tried msvc modules). GCC and clang will stop you from using intrinsics for instructions you haven't enabled at compile time (e. GCC uses its own IR generation where Clang uses LLVM IR. Now I am wondering, does this say that MSVC produces better binaries (and I mean better as in smaller+faster)? Or doesnt this mean anything For MSVC / ICC, you can use intrinsics for ISA extensions you haven't told the compiler it can use on its own. o -o myprogram. I want to use the a weak symbol in a static library that users can override in their application. Some parameters are handled specially. That version is when it became a derivative of Clang, gaining all of the attendant language feature support of the base compiler. For Windows Users that want to use the Visual Studio compiler (called MSVC) see instructions here. 0 SDK when running the vs2015 command-prompt. the discussion of this feature begin Introduction. – Peter Cordes. For GCC, Clang and ICC, use -O3; An easy way to check if the compiler did the optimisation is to perform a call that would otherwise result in a stack overflow — or looking at the assembly output. 1 @Rezzie The flags in ClangOverrides. Let us switch back to Windows and build clang and icc have adopted this GCC extension, but MSVC has not. Insgesamt setzen GCC und Clang die Kernsprache zwar schneller um, MSVC punktet jedoch bei den C++-Bibliotheken. So technically, the compilers are not required to give a diagnostic. This mode is perfectly compatible with GCC and Clang preprocessor, so it does macro magic well. For example when i started I had no msvc on my computer but I tried to build with -msvc at the end. This tutorial does not teach you about GCC, GDB, minGW-w64, or the C++ language. The Intel compiler can also switch between MSVC and GCC compatible modes. -fdiagnostics-show-category =none/id/name ¶. When talking about optimization, and "reliability", Clang wins because of the LLVM. [] C++23 core language feature You can now build and debug the project using the Clang tools. The "DerivedFoo" case produces different results on MSVC than on clang or gcc. h>. Recently, clang (and clang++) using LLVM has been gaining popularity as an alternative compiler. What is the difference between cla With GCC and clang, my code will be auto-vectorized if I compile with :-O2 -ftree-vectorize -march=XYZ (XYZ being the target instruction set: native, SSE, AVX2, etc. Linking zlib in Visual Studio 2012. Make clangd aware of macros given from the compiler. One such scenario involves a code snippet that compiles without issue on GCC and MSVC but fails when using Clang with C++20. First, we should distinguish between warnings and informational messages. g. It's hard to tell what MSVC is doing, godbolt doesn't exactly support it well. This is known as Small (or Short) String Optimisation (SSO). However, MSVC has a template parsing model that delays nearly every lookup to instantiation time, which is part of phase 2. 3) using: -GVisual Studio 15 2017, -GVisual Studio 15 2017 Win64 and -GVisual Studio 15 i personnaly think it's better to add a global flag --cxxstl (which will be no-op on msvc, change stl library on clang and maybe gcc) and it would be used to discriminate package (so for example we could install fmt library with libstdc++ AND libc++) Describe alternatives you've considered. And there were a bunch more. This is related to Determine cause of segfault when using -O3? In the question, I'm catching a segfault in a particular function when compiled with -O3 using a particular version of GCC. LLVM code I'm on win10 and I have installed: MSVS2022 with msc++ compiler, codeblocks with Mingwin-g++ compiler and then llvm clang. Visual Studio detects that you're using the Clang compiler and provides IntelliSense, highlighting, navigation, and other editing features. 2 but not MSVC 19 Hot Network Questions How would society develop on a culture in a tropical island area, and what would their environment look like in the Stone Age? gcc and clang agree on evaluating the static_assert. Practically both are well optimized, however, LLVM IR is much more robust and modular, than GCC IR. ) It's worth noting that the MSVC libstd headers don't always play nice with Clang due to mainly being targeted at the MSVC compiler. struct A { explicit A(int = 10); A()= default; }; A a = {}; //msvc ok but gcc and clang fails here Live demo. Visual Studio 2019 version 16. Hopefully we'll have C++23 std::print available soon. In this tutorial, you configure Visual Studio Code to use the GCC C++ compiler (g++) and GDB debugger from mingw-w64 to create programs that run on Windows. This information tells you the flag needed to enable or disable the diagnostic, either from the command line or through #pragma GCC diagnostic. __builtin_clz has With this target, Clang will look for Microsoft's msvc linker on PATH and use it for linking. 0: 84: February 17, 2021 Adding sanity to the Atomics Detect gcc as opposed to msvc / clang with macro. Die Projekteigenschaftenseiten für eine Clang-Konfiguration ähneln denjenigen für MSVC. Compiler Explorer is an interactive online compiler which shows the assembly output of compiled C++, Rust, Go (and many more) code. Statically-initialized empty strings in msvc and clang consist of integer constant data; no pointers. I'm not sure what you were intending by this comment, but certainly in my current C++ 20 work codebase we regularly find a consistent order of C++ 20 implementation quality: MSVC's STL, GCC compiler, libstdc++, MSVC compiler, libc++, clang. It is technically true, but it is stupid. as a prefix for each level of nesting in the headers. It is possible to use gcc's linker MSVC 6 and GCC 2. Also, gcc has the proper coroutine support header but limited optimisations, while clang has powerful optimisations for coroutines but doesn't work with the libstdc++ header and the libc++ header is still under the experimental subdirectory last time I checked. Asm to machine code (including for asm coming from an asm("") template string) is a truly separate process for gcc, and logically separate for clang. Example: Const NTTPs Clang Frontend. Though non-standard, it is available on both compilers. Clang on Windows: how to disable the default MSVC compatibility? Hot Network Questions What is the significance of Balaam's donkey being a she? Crocodile paradox Is the Hilbert Mumford Criterion true over the reals? Can I decided to compile it myself but as the libiconv documentation states, there is no official support for MSVC compilers. exe matches the This document currently describes Clang configurations on POSIX-like operating systems with the GCC-compatible clang driver. I simply assume that Clang mirrors GCC's dialect options (for example, C++03 is valid on Clang), although without proof I cannot state so conclusively. If you've been working with C++ and have encountered issues when compiling std::max with different compilers, you're not alone. And I'm sorry it's gone that way, ten years ago clang had fabulous quality of implementation, but last First, Clang attempts to be ABI-compatible, meaning that Clang-compiled code should be able to link against MSVC-compiled code successfully. txt in a directory named basic with some cc files:. 16. cc power. Whether you are building IoT apps or high-performance computing cloud services for Linux, Visual Studio will help you be productive. I wonder why clang treats abort differently though. 3* 4. Commented May 4, 2021 at 4:38 (And BTW, to exactly emulate _lzcnt_u32 without BMI1, you'd want lzcnt = x==0 ? 32 : 31-bsr(x);. 4. What's the shortest way I can detect both 32-bit and 64-bit x86 that works in MSVC, GCC, and Clang? – Aaron Franke. I then installed latest cmake and have a very simple CMakeLists. clang implements GNU C, and AFAIK doesn't support MSVC intrinsics. [WIP] A forked version of LLVM-18 that prioritizes MSVC compatibility. ). For Depends on the libc++ specific Msys2 Clang library, binary incompatible with msvc one: Msys2 MinGW Clang: libstdc++6. Ask Question Asked 7 months ago. Commented Aug 14, 2019 at 16:15 | Show 1 Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company MSVC has new preprocessor mode, enabled with /Zc:preprocessor. Clang without GCC or MSVC. – I'm currently using GCC, but I discovered Clang recently and I'm pondering switching. That's the optimization level in translating C++ to asm. cpp -o myprogram. GCC says: Notes. Clang tries to be compatible with GCC, but sometimes it just quietly ignores them. MSVC ABI and Itanium disagree about a lot of things. It does a great job optimizing with array accessor properties. Also is there a way to make the program work with all compilers? There's MSVC, Clang, and GCC, yes, but there's also the Intel compiler, the PGI compiler, and so on. Namely, clang 13 and gcc 11. For two reasons. Commented Aug 14, 2019 at 15:56. And I'm sorry it's gone that way, ten years ago clang had fabulous quality of implementation, but last Any MSVC equivalent to GCC '-include' flag? 11 does msvc have analog of gcc's ({ }) 9 msvc's equivalent of gcc's __BASE_FILE__ Detect MSVC using preprocessor without detecting clang-cl, icl, Load 7 more related questions This option tells intelliSense which compiler to use. For instance you can aim for your code to work on x64 linux and windows, gcc clang and msvc, latest version , or from version x upwards and ignore everything else. In some cases (such as omitting the typename keyword inside templates) this made development tasks more convenient, even if Template code that compiles in gcc 8. This delay is why your example would compile with MSVC(which is non-conforming) and not in clang. Just encountered a similar issue myself and discovered CMAKE_VS_PLATFORM_NAME, which is calculated based on the generator and I think it's worth a mention. 8)* As we can see in the above table, the entry for clang is empty/blank meaning that this feature has not been implemented in clang as of now. 2 Preview 3 includes built-in Clang/LLVM support for MSBuild projects. When debugging, you can use breakpoints, memory and data visualization, and most other debugging features. 6. Einige compilerabhängige Features wie When you have msvc 2015 and 2017 installed, and trying to build with msvc 2015, it will autodetect the 10. express dominating operation(s) using SIMD instruction. call. c++; templates; gcc; visual-c++; Share . A compatible STL wasn't GCC is a set of the full compiler, where Clang isn't. The term "auto-vectorization" means the ability of a compiler to transform given scalar algorithm into vectorized one, i. One key difference between the three compilers is in how they handle the deduction of const-ness for NTTPs. Now let's look at how exactly this program is well-formed in c++20. Recently, a question on Stack Overflow sparked interest regarding the behavior of static and extern declarations, and how this differs across various compilers like GCC, Clang, and Both GCC and Clang allow you to write plugins that can extract such information from the generated AST. Clang on Windows: how to disable the default MSVC compatibility? Hot Network Questions What is the significance of Balaam's donkey being a she? Crocodile paradox Is the Hilbert Mumford Criterion true over the reals? Can I'm not sure what you were intending by this comment, but certainly in my current C++ 20 work codebase we regularly find a consistent order of C++ 20 implementation quality: MSVC's STL, GCC compiler, libstdc++, MSVC compiler, libc++, clang. 9 2. 10. 79 1 1 silver badge I am trying to get decent performance out of MSVC for this code. While in most cases we recommend using the MSVC compiler, we are committed [] is this well-formed or ill-formed etc as per the standard. The entire module's computation took 30s on Modules support is pretty buggy in clang and gcc (I haven't tried msvc modules). Score: Clang: 2, GCC: 0, MSVC: 1. Distinct functions must have distinct addresses Visual Studio erkennt, dass Sie den Clang-Compiler verwenden, und stellt IntelliSense, die Hervorhebung, die Navigation und andere Bearbeitungsfeatures bereit. 0 14. I want to wrap a single function in a lower optimization level. Viewed 504 times 3 The following preprocessor macros (the usual suspects: testing on empty argument list and counting number of arguments) run without warnings on gcc/clang but fail on Microsoft GCC/Clang inline assembly wrapper, C macro pre-processor based. 1 [temp. Zig depends on LLD for linking rather than shelling out to the system linker, like GCC and Clang do. How to compile zlib with clang and cmake. On Linux, it will use the distribution’s Guide to predefined macros in C++ compilers (gcc, clang, msvc etc. Best . )-O3 -march=XYZ; With MSVC, my code will be auto-vectorized if I compile with: /O2; This video seems to suggest that I do not need to specify the architecture with MSVC. How can I differentiate, in my C/C++ code, between GCC and clang as the compiler? Hot Network Questions How can I get the % address of a graphic object? Calculating Zeros of the Zeta If you use -MM or one of the related options (-M, etc), you get just the list of headers that are included without having all the other preprocessor output (which you seem to get with the suggested g++ -E -dI solution). exe matches the Differences between MSVCs _snprintf and official C99 (gcc,clang) snprintf: Return value: MSVC: return -1 if buffer size not enough to write everything (not including terminating null!) GCC: return number of characters that would have been written if buffer large enough; Written bytes: MSVC: write as much as possible, do not write NULL at end if no space left ; GCC: write as Microsoft added a convenient /Qspectre to their MSVC compiler (although that seems to only be (trying to) mitigate Spectre v1 at the moment) that they will be updating over time. exe ' cpp = ' For MSVC, use /O2 or /Ox. This is quite nice from a users perspective, just enable that flag and you get the latest and greatest mitigation they have in store. MSVC just trusts you know what you are doing if you use a particular intrinsic, and that you will guard the code-path appropriately. Follow asked Oct 28, 2013 at 13:06. cmake_minimum_required(VERSION 2. MSVC STL. Here is a link: I tested it on godbolt with different version of GCC and MSVC 17(local) and 19. This blog post will delve into the specifics of this issue Passing -fno-diagnostics-show-option will prevent Clang from printing the [-Wextra-tokens] information in the diagnostic. How to detect Cross GCC compiler using Macros. Clang is going to use the standard library (and other libraries/headers) of that compiler, since it GCC/Clang vs. - Releases · backengineering/llvm-msvc Clang and MSVC are correct. zig creates a C library but not usable by C. ) When writing portable C++ code you need to write conditional code that depends on compiler used or the OS for which Even clang isn't optimal; with planar data we can probably use pmaddubsw to do 8x8 => 16-bit multiplies after zero-extending, or maybe just pmullw which works for the 129 GCC Clang MSVC Apple Clang When targeting Windows with the MSVC-compatible clang-cl driver, some of the details are different. You can't compile a C++ interface and mix and match between compilers, unless it is explicitly supported. In the world of C programming, understanding the nuances of variable linkage and scope can be tricky, especially when employing storage-class specifiers like static and extern. asked Nov 26, 2020 at 5:26. ,put=. So your second example is the only correct way to do it; GCC and Clang may have been optimizing away the use of foo::a since references can’t be rebound. It's not clear for some people. clang and g++ are correct. If [] GCC 13, CLANG 14 and MSVC 16. Nvidia HPC C++ (ex PGI)* Nvidia nvcc _Static_assert with no message N2265: 9 9 Yes Yes Depends on the libc++ specific Msys2 Clang library, binary incompatible with msvc one: Msys2 MinGW Clang: libstdc++6. Their success has produced lasting effect of driving C++ adoption, but they had many incompatibilities with each other, resulting in beautiful walled gardens. You also need to avoid using /arch:SSE2 with the x64 compiler What's the shortest way I can detect both 32-bit and 64-bit x86 that works in MSVC, GCC, and Clang? – Aaron Franke. 29 calls the templated constructor. Live demo #include <array> template<std::size_t N> struct Differences between GCC, Clang, and MSVC. This option tells intelliSense which compiler to use. And vice-versa, when change compiler from MSVC to GCC or Clang automatic replace compiler options back. From the official docs of VS Code ():intelliSenseMode: The IntelliSense mode to use that maps to an architecture-specific variant of MSVC, gcc, or Clang. You can also use the -H option. However, if you use __declspec(empty_bases), you can tell MSVC to enable this optimization: #ifdef _MSC_VER #define EBO_ENABLE __declspec(empty_bases) #else #define EBO_ENABLE #endif class EBO_ENABLE Empty3 : Clang and GCC will not compile it. Is that For Clang I usually use the trunk version (again, because it is easy to build), but I never saw it generating wrong output. (1) When the company started & chose vxWorks, clang wasn’t an option. The problem in my case was that the . clang supports the Microsoft #pragma pack feature for controlling record layout. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. The latest preview brings Clang into the fold. this]) is X and. Game developers struggle with debugging on ARM, and cross-compilation is simpler with GCC and Clang. This part is pretty straightforward. Are there any command line arguments (flags) to implement this feature in GNU/MinGW toolchains? Differences between GCC, Clang, and MSVC. This version is tailored for Windows users. Visual Studio has had great tooling for MSVC and GCC for quite a while now. Platform defaults: Making MSVC compiler GCC complient? 0. When you use -o with zig cc, Clang is not actually acting as a linker driver here Neither GCC nor Clang is a linker, and ICF needs to be done by the linker, or at least with cooperation with the linker. (icc be damned Clang clearly won here, with MSVC in second. This shows that the problem is related to odr-use and when definitions of member functions are instantiated. Using zig That doesn't work on clang unfortunately. What does the standard require? Background: I am providing a combination of a template-argument-dependent return-type and static_assert to indicate correct or incorrect template arguments in a function. inst] paragraph 2 says "[] the specialization of the member is implicitly instantiated when the specialization is referenced in a context that requires the member definition to exist" MSVC explodes it into 4000. lambda. Is that GCC is a set of the full compiler, where Clang isn't. Instead, I fix the problem using a "native-file": $ meson --native-file = meson-native-clang build-clang. GCC Standard Predefined Macros quote:. As far as I know, MSVC doesn't allow you to change language standards like the two above do. a hypothetical instantiation of a templated entity immediately following its definition would be ill-formed due to The following tables present compiler support for new C++ features. Also you should be aware of the x32 Members of *this are never captured: they can’t be explicitly captured, and using them implicitly captures *this (by reference regardless of the capture-default; consider using [=,this] for clarity). Not only is there Clang, there's also ClangCL and the Clang CUDA compiler. Another difference with Clang -march vs. In the latest Preview of Visual Studio, we have extended that support to also include MSBuild projects. Modified 5 years, 11 months ago. Choose the desired Clang configuration (note that separate Clang configurations are provided for Windows and Linux), then press Select: Then I wrote the following program that compiles with msvc but both clang and gcc fails to compile this. #endif doesn't work, both compilers define _MSC_VER. With this target, Clang will look for Microsoft's msvc linker on PATH and use it for linking. My understanding is that this wasn't possible in the past due to: A LLVM linker wasn't available. -O3 should be irrelevant, even for clang's built-in assembler. Asking for help, clarification, or responding to other answers. Its documentation does not mention C++17. I'd like to use clang without GCC on Linux and without MSVC on Windows. Members of *this are never captured: they can’t be explicitly captured, and using them implicitly captures *this (by reference regardless of the capture-default; consider using [=,this] for clarity). The question at hand is which compiler, Clang or GCC and MSVC, is correct when it comes to accepting or rejecting a program that uses the new keyword. 95 have sometimes been described as ‘too successful’. Abandoning MSVC would ease these processes and enable cross-compiling Windows binaries on Linux, benefiting developers. Top. Improve this answer. 8k 11 11 gold badges 80 80 silver badges 119 119 bronze badges. You can specify the SDK-version by modifying the "VS2015 x64 Native Tools Command Prompt" to force the 8. This can be seen from expr. I stumbled over the following piece of code. Use sizeof(), static_assert and so on instead. Using zig In the ever-evolving landscape of C++, keeping up with the changes introduced in the newest standards can sometimes lead to perplexing compilation issues. Clang Frontend. a compiler memory barrier, like c++'s std::atomic_signal_fence). 8 for gcc/clang. (gcc/clang using GNU/Linux libstdc++ pass an extra length arg to the cout operator overload function, not just 2 pointers like MSVC does when using its own C++ library. But I cannot link against MSVC libraries if I use Clang in MSYS2/Clang64 (MinGW-w64) toolchain yet. It prints the headers as they are included with one dot . Rust takes up 900 MB after installation, when using "x86_64-pc-windows-msvc" (for a "Microsoft C++ Build Tools" install). – DLRdave. 所以 msvc 算是一个不错的 c++ 编译器，但并不能算是一个具备主流水准的 c 语言编译器。 在微软的平台下，微软也从来不推荐你使用 C 语言，人家最初一开始玩的就是 C++ 跟 COM，现在玩的是 . Tools ¶. After configuring VS Code, you will compile, run, and debug a Hello World program. 26: 150: April 11, 2012 [libc++] Porting libc++ to embedded targets/compilers. gvry bgf mpcmiz bpnokx zhitrn tfaiqhcp flkuo wroq vnn pudca