Msvc vs gcc performance reddit. These two compilers are very similar.

Msvc vs gcc performance reddit Linux is the only modern OS that has a strictly-defined kernel/syscall interface and ABI for each architecture. Library writers now have less reasons to agonize themselves between constexpr-friendliness and runtime performance. However I also thought of a subtle potential bug that could happen between checking the existence for the file in an init function (that gets the path from the user input) and actually constructing its associated ifstream in the scope of the aforementioned std::jthread. ) 91 votes, 10 comments. But even then there will be differences between clang and gcc. After (if) you've built sdl2-image for example, you will then need to link the static C libraries when building your application. The cost though was the images produced weren't always the exact same (e. Windows is obviously not an OS aimed at programmers. Crypto <chrono> Formatting: C++20's Final Boss. You look up info online using terms like 'msdn printf'. the title of the -reddit- post, its pretty clear that the blog isn't talking about a general statement. I know that I can simply remove consteval and it works, but here it seems a good place to use it: I know the characters that I need at compile time, I just need them to be integers, so to me it seems like a perfect place to And there a two different levels of module support. r/gcc: Created by the GNU project GCC is a compiler system for C, C++, Objective-C, Fortran, Java, Ada, and Go. a. vs. Intel's compiler has also lost in popularity since its hidden "Cripple AMD" function was revealed. Sep 10, 2014 · *The type deduced by Clang and GCC for the operator T&() case is determined by running the code with operator const T&() removed. . Again - MSVC with conan works rather well. your target triple ends in -msvc) require cl. Does GCC allocate it at declaration time and is this allocation done on the stack? In particular, MSVC pch also emits a . Situation 1: We have the following two files: //building. Clang has better warnings but the optimizer is deficient, especially for older platforms. Jul 23, 2011 · 2) Other than performance differences between the compilers themselves, is there an overhead associated when compiling using MinGW/Cygwin and gcc - as in does the emulation layer get compiled into the library, or does gcc build a native Windows library? 3) If speed is my primary objective of the library, which is the best method to use? Dec 15, 2019 · These days there are few differences between compilers (MSVC, GCC, Clang/LLVM). compiler intrinsics)? The nice thing about SIMDe is you don't have to compromise, in that if you wish to code for top performance on one specific ISA, you can still get often decent performance on another, and crucially your code is still testable. I would need some kind of project separation (like virtualenv on Python). So a lot of this is also just VS providing a standard-libary that isn’t very optimized with regards to streams. The big three compilers do still take inline into account for heuristics, and GCC and Clang have always_inline whereas Clang and MSVC have __forceinline. Especially on GCC they wrap pthreads even on Windows via a pthreads library that wraps native Windows threads. , plus MSVC tends to work better in the VS debugger (clang-cl often says "symbol was optimized out" even in -O0 debug build). My build is non trivia as it links a rc object file that's produced from Windows SDK rc. stdint_gcc. 1 - a fast game engine for unified-memory platforms Now obviously you can compile this in C as the standard supports dynamically sized arrays. The official Python community for Reddit! Stay up to date with the latest news, packages, and meta information relating to the Python programming language. However, the only official way of installing MSVC is through the visual studio installer. My code has to run on OSX, Linux and Windows. 5x in performance between the best (Intel compiler) and worst compiler (LLVM clang compiler) on our Structure Function kernel (highly-tuned code for SKL). Its doc says: Windows platforms targeting MSVC (e. In other words, if you want to use latest Clang on Windows you will need to have MSVC installed. Even compilation not existing binaries for log4cplus,boost or gtest. clang and clang++ are then the compiler executables used. 0 MSVC build. Is there any performance benefit to using one over the other? I personally am using mvsc + cuda because I get an additional 800/hs. 5x in performance between the best (Intel compiler) and worst compiler (PGI compiler) on our Jacobi solver kernel (bandwidth-limited stencil obscured by abstraction techniques). There are of loads of C compilers for Windows; it's not all MSVC. h is a GCC header file so it's non-standard and cannot be relied on to be available everywhere. You are just running into "different implementations are implemented differently. This comes with MSVC (Microsoft’s C/C++ compiler) and an integrated IDE that is all set up to use. stdint. One of the greatest products Microsoft has ever created is their visual studio ide. The only exception are utilites ported from Linux which are unrelated to the compilation process, such as grep, sed, bash, etc, which don't have prefixed packages. Committing VS files to source control kind of sucks, with CMake you can configure it to generate the right VS solution every time. MSVC at 14 cycles / iter on SKL or 12. 75 c/B or 1. The reason for the compilers is relativly simple-minded: MSVC gives me pretty much direct access to DirectX code, which I obviously do not need on Linux. Members Online Arete v0. obj file containing the generated code for everything in the pch header, while clang/gcc seem to just be a cache of the parsing state. The issue is that Clang-targeting-Windows doesn't yet support any form of no_unique_address (either the Standard attribute or the msvc:: implementation-specific one), so attempting to use the attribute would prevent code from being variously compiled with MSVC and Clang and then linked together. IAR and ARM have varieties of there toolchain that have been 3rd party tested and declared suitable. However, I'm not as fluent in x86 assembly as I would like to be, and it seems that MSVC is generating extra instructions that are either are never called or are not necessary. For organizations An unlimited number of users within an organization can use Visual Studio Community for the following scenarios: in a classroom learning environment, for academic research, or for contributing to open source projects. Edit: Moreover, Daniel Dunbar (who ran those tests) did a fair bit of work in the Blender code in the past, I'd be surprised if he bypassed our build system to compile his tests. Reply reply &nbsp; A lot of the times the performance criticisms come from windows-users who compare streams to the C-stdlib. One thing is that clang is used in every case for the diagnostics in the Qt Creator as it provides a library / server mode which enables that. There are other compilers than GCC and MSVC out there, and once you start using non-standard extensions you have to keep track of which ones support the particular extensions you use. I am willing to cut a lot more slack for gcc or clang generating wrong assembly than something that cost tens of thousands of dollars. You can throw money at performance problems (more and bigger servers), but not so much at team collaboration / interoperability issues. k. A lot of the times the performance criticisms come from windows-users who compare streams to the C-stdlib. The MSVC toolset does still implement the weak ownership model, though it is not on by default. But why is it recommend to use Microsoft Visual studio c++ build tool?? Is there any defect in using MinGW GCC rather than visual c++ build tool? 3. exe, but I'm not sure. However GCC C++ seems to allow this kind of construct through some kind of an extension. Currently, on Windows, Clang is built with MSVC and it depends on MSVC for C++ header files. if you where not so quick to point out you're Either way for highest performance you probably need to write vector intrinsics, as the auto-vectorizers are nowhere close to perfect. In a nutshell, the problem is this: on Windows a shared library (DLL) has an accompanying import library ( . Clang attempts to unroll loops really, really aggressively. Dropping MSVC for windows-specific stuff, much less so though. You don't ever need GCC to build Rust code. Projects wishing to use the weaker form will get the usual linker errors which surface in the example from the blog. That's why msys2 offers both ucrt and msvcrt variants of mingw-w64-gcc and mingw-w64-clang. Jun 25, 2023 · This applies to all compilers, libraries, etc. Nov 14, 2024 · the difference is not in the C compilers per se (clang vs gcc), it is the C runtimes (a. Business, Economics, and Finance. C++ has cstdint for these types, you should include that instead. In MSVC this builds successfully (with warnings of course) and runs, but does not print "1. Although it's not clear if Clang routinely generates ASM intermediate files, as gcc does, or only when asked by using -S. GCC is an open-source compiler and tool collection, not an IDE, though there are many IDEs that can work with it (for example, Code::Blocks and Clion). You can probably use it as a generic C++ compiler, but it is primarily intended for writing highly parallelized code, especially for dedicated accelerator hardware like GPUs and FPGAs. On gcc, execution time came down to 10 ms without compiler optimization and with O3 flag, per run came down to <5ms. I'm not able to find the numbers right now for GCC without LTO, but I recall it was still faster than ICC. It's much easier to work with thread locals (not necessarily any faster than ordinary usage, bc the first access of a thread local in a function very likely generates code that grabs the pointer to it via the pthreads API, but easier). MSVC is fine if you are actually targeting Windows; MSVC is not nearly as bad as some here would have you believe. This code works fine under GCC because GCC does templates right. If debug performance means I can only hit ~50fps on a high-end dev machine and get unplayable performance on a target min-spec consumer machine, that's still "good enough" for many development purposes. I trialed VS 2022 for a few weeks and my god the performance uplift was insane! Yeah, but in my experience, while MSVC is the first one to claim full support, clang and GCC take longer but have fewer bugs/ICEs when they are released. On Windows the 'native' C compiler might be MSVC. Note that "Clang on Windows" does not necessarily always mean "clang-cl as a replacement for cl in the context of an MSVC toolchain". Compiling your Windows software with ClangCL may lead to better performance (in Release mode). Intellisense and syntax highlighting drops out all the time, and if I use a plug in to help like resharper or visual assist the IDE will crash on a regular basis, probably from hitting the 4GB memory cap. MSVC and VS Code are quite nice IDE. txt files instead of a bunch of VS configuration files saved. If I am making a Windows program I will be using MSVC even though I am 100% in love with gcc. There was a benchmark recently on Firefox on Wine with MSVC being unmistakably faster than the native Linux GCC built Firefox. For example, clang generates mediocre x87 floating point code while gcc excels in this regard. I'd be surprised if GCC or CLANG produced bad code, due to the openness of their development and the sheer number of users. So your program is linked with gnu glibc compiled by gcc instead of ms libc compiled by msvc, but your program is still compiled with rustc and its default llvm backend. It also gives me some Windows-Unique features (which I haven't used yet lol). However - precompiled binaries are installed system wide. 2. 274K subscribers in the cpp community. dpcpp and icc are different tools. If you look in the GCC source code, Intel spent a lot of time making a decent scheduler model for their Atom. The probably best alternative for MinGW would be Code::Blocks, but there are worlds in between, especially regarding code completion and the debugger. You stand at the entrance to the Fortress of Chronat. GCC and clang have had for a long time the __builtin_expect()intrinsic for giving branch prediction hints. Except that on Linux, gcc and the C library and gnu C and man and everything are all intimitately associated; it's hard to prise apart from C, the C runtime, and the C compiler from the OS. This paper reports a performance-based comparison of six state-of-the-art C/C++ compilers: AOCC, Clang, G++, Intel C++ compiler, PGC++, and Zapcc. the fuzz was a bit different on larger images), and the binary produced isn't Jul 21, 2020 · So 0. As far as I understood, forward declaration of classes with smart pointers is permitted when certain conditions are met. MinGW is just one port of GCC to Windows, it's not the only port. 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 "Compile everything with gcc" Actually attempt this for a project with 3 files or more abd you'll immediately realize that it doesn't work: typing out 5 commands like Then I watched Gabriel Dos Reis' very informative talk 3 where he says a large project using C++20 Modules (with current MSVC in-progress, pre-optimised Modules implementation) is about 5x slower than a traditional PCH #include version. still you always need that strong base to remain i. " So you could have the some sort of issue moving from gcc to VS. They do use their own C++ standard library implementations though (not sure about the Clang that ships with Visual Studio though) Also I believe that GCC in many (but not all by far) circumstances is able to produce the fastest code of all three, though the difference is almost negligible. I was going to pass the struct to a thread and that thread could create its own ifstream using the path members. So 1. No, if you use some other compiler, you can have a transient include that isn't included by VS. It's often comparable to GCC on Linux though. EDX,ECX, and if you look for the Intel and AMD devel manuals (Instruction Set Reference, or CPUID Something Despite being in the C standard, major compilers like GCC and Clang only added it multiple years after the standard's release, and afaik MSVC decided not to add support at all. 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. The standard says that in the event that the compiler finds a call to a function it doesn't know about, it should assume that it returns an int. Sep 12, 2019 · The Intel compiler used to be on the cutting edge of code optimization, but now it has been overtaken by Gcc and Clang. The libraries I'm linking against are: Boost; Catch2; Loguru; CLI11; I suspect that MSVC might use precompiled headers to gain such a speed boost or maybe vcpkg can install precompiled headers for libraries too? Some header-only libraries can Jan 1, 2023 · Compile on both (and also Linux / gcc) to cross reference standards compliance and warnings etc. In my experience, for my tasks, it also produces faster smaller binaries. The problem is that get is specified to throw bad_variant_access if the variant holds a different index, so the compiler will emit that throw operation and you're relying on the optimizer to work out that it's dead code (by comparing to the previously retrieved value of index) and remove it. I guess we could drop AIX without a hitch. 8. You aren't running into a VS problem, per se. also the blog post disproves what you are saying: compilers / optimizers DO touch intrinsics, otherwise there would be no difference between clang and msvc codegen at all for this code base. lib ) to which one links in order to use the DLL. 57x as long to run), on Ice Lake it's 2. I like SAL in MSVC and their integration with Visual Studio. Only difference is compiler used (gcc or msvc) Some people think gcc is faster but I personally have never seen it matter, and it's harder to manage to get it to compile on Windows with gcc than MSVC-Build-Tools which are just as free to use as gcc. It misses a lot of basic optimisations that you'd expect, and trips up over pretty much everything. In fact, this post is asking for practical actions one can take to port code from GCC to MSVC or better, to write code without portability issues from the beginning. These two compilers are very similar. -mtune=native tells GCC to prefer output that strongly favors your CPU, even if that tanks performance on or compatibility with any other CPU. If I run gcc -S main. Even MSVC's compiler stomps on GCC by 10% or so. Visual C++ because it often has higher performance with math calculations than MinGW. I think one of the reasons is dependencies between compilers, many compilers for HPC depends on gcc/clang, these ones offers more options and higher performance. Also I need MSVC anyway due to it's the only way to build the CUDA plugin. Unlike the last boss's fortress, which extended to infinity in two directions, this fortress seems eternal instead of infinite. If debug performance gets to the point where I can't hit even 15fps on a high-end dev machine, that's a different story. I have downloaded Rust and I didn't downloaded Microsoft Visual C++ build tools because of it's large download size, rather I have MinGw Gcc for the linker. e: gcc/clang Dec 10, 2018 · How to fix certain issues when porting code from GCC to MSVC. I am currently using MinGW64, MSYS2, and CMake to compile (Targeting 64bit x86 Windows and Linux). Other options if you’re on Windows: install “mingw”, which is a build of gcc for Windows. If you're targeting windows-gnu, then just the Rust toolchain is all you need. Adding the extra row of parentheses should work on any reasonable compiler — the extra parentheses are explicitly considered to silence the warning at least with GCC and clang (I don’t know about MSVC, but that one is still playing the catch up game anyway) Clang tries really hard to be a drop-in replacement for gcc. A fine reason to stick with GCC / Clang is if you really can't be bothered learning how to use Microsoft their tools. So, while the msvc people are really fantastic, and they've made massive strides from a conformance perspective, msvc also by far produces the worst code of the gcc/clang/msvc trio in my experience. An in order processor is highly effected by how instructions are scheduled. Its C compiler is pretty awful. 0). To write cross platform code, what other Static analysis extensions exist for compilers like gcc or clang, and what are some IDEs that have integrations with them? Are there any cross platform static analysis annotations I can put in my code that other compilers can tolerate? Feb 27, 2023 · There may be a significant performance difference between Debug and Release code (e. Practically both are well optimized, however, LLVM IR is much more robust and modular, than Latest vs2019 C++17, LLVM vs MSVC compilers (64-bit): sequential vs parallel computation test -> MSVC better? So using the same test C++17 code with two different release targets (both optimized for speed), I get similar results (even if often a bit better with MSVC) except for sequential sums. And GCC was quick to setup for Linux, haven't really looked into Clang yet, which I should definetly do. --- If you have questions or are new to Python use r/LearnPython rustc_cg_gcc is not yet distributed via rustup, I think you installed the x86_64-pc-windows-gnu platform, as opposed to the x86_64-pc-windows-msvc one. Some people are confusing dpcpp and icc. For the record, these are the build options on GCC: -pipe -fPIC -funsigned-char -fno-strict-aliasing. libc, which determine the "env" or "abi" part of the target triple). GCC is a set of the full compiler, where Clang isn't. 5 spec and is working on full 5. MinGW because it's the closest to GCC and gives me a good indication of whether or not my code will compile cross-platform without having to wait for the build system. They have a bunch of ways to ensure that only the parts you need are de-optimized, like a DebugGame build where the engine is optimized but the game isn't, automatic deoptimization of files that have local edits, macros for compiler agnostic deoptimization sections etc. For individuals Any individual developer can use Visual Studio Community to create their own free or paid apps. Sometimes this has a huge payoff. 65x faster. It's hard to say why one compiler would be better than the others. I'm not hating - I like MSVC and really enjoy the Visual Studio IDE - but I'm just curious as to what keeps it behind the others considering Microsoft's considerable resources. I've seen some Julia used for specific high performance needs, but that's it in 4 years working with data science teams at 3 different companies. But then, I look at this compiler support table and see that MSVC is behind GCC and Clang and has been for a long time (afaik). And if you don't have benchmarks for your program, you don't care about performance. It also keeps the repository clean, since all you have is a couple of CMakeLists. IntelliSense acting up? Nuke the build folder and start over. Many gcc extensions and almost all of the command line options are supported by clang. Hello,I have two situations with diverging compiler output. When I added -march=native (to GCC) I got a fairly good ~15% performance boost. Instead, it prints out a random number. E. It's a little slow to implement the absolute bleeding edge new C++ features, if that's important to you. In contrast, VS tries to, maybe, precompile the function? Presumably gathers data on the templates ahead of time. Jul 21, 2015 · I have read some questions about GCC vs MSVC and the development of these compilers such as GCC worth using on Windows to replace MSVC?, Visual Studio or GCC? and GCC vs MS C++ compiler for maintaining API backwards binary compatibility. Reply reply Daniela-E As far as addressing your concern about writing portable code across clang/gcc/MSVC: there is still an avenue for this. That MingW etc exist is nice and all but in practice those things are usually just not worth the hassle. Of course, if you're compiling C or C++ as part of your build, you need a C/C++ compiler. This surely helps performance in an in order pipeline. 3D engines or high performance scientific code. May 4, 2012 · A is 16byte aligned making it 0x20(32) B is also 16 byte aligned, but is either also 0x20(32) on GCC but on msvc it is 0x30(48) is there a way to force the msvc to pack the data like GCC is? Reason for this: I create data and load it directly into the classes on different platforms. Now with C++20 we also have support for [[likely]] in MSVC, but the syntax of both of these is incompatible. Until recently, you couldn't link C++ code from MSVC with C++ code compiled with a free compiler on Windows. 68 c/byte or 0. The entire module's computation took 30s on msvc. all the modern windows toolchains use msvc standard C libraries, even the mingw ones. While this makes MSVC pch a bit harder to plug into a build system (because you also need to ensure the . Clang uses LLVM in the backend. Dpcpp is a new compiler based on LLVM for writing SYCL code. DX11/DX12 is a library, technically you should be able to link against it using Clang, but you will need to have MSVC installed. GameStop Moderna Pfizer Johnson & Johnson AstraZeneca Walgreens Best Buy Novavax SpaceX Tesla. Whenever I try googling for comparisons, I get a few pages indicating that sometime around 2013 LLVM caught up to GCC in optimizing the binary for execution speed. 0 support. 3. Jan 30, 2021 · What could be the reason for this major performance difference? MSVC: ~36 seconds GCC: ~1:10 minutes. Outside of the last VIA C7, it's the first in order x86 in eons. This should however only really matter if you write really performance sensitive code, e. I don't know who your company would turn to if GCC produced bad code that resulted in there being legal issues. This is mostly for support reasons, not day-to-day work practical ones (IMO). MSVC gives me at least 10% more performance in graphical applications. So, since you forget to include the stdlib header, the compiler doesn't know malloc exists, so it doesn't know what type it returns. I might migrate to cmake with GCC, I've just been putting it off because it's a lot of overhead to rewrite all of my qmake project files. I think that in newer versions of VS you can also optionally install a Windows version of clang directly and use that if you prefer it over MSVC. Both GCC and Clang are well-matured compilers. Usually it's marginally faster with GCC. For gcc or clang, I can go to the mailing list and create a bug. But once it's on your system you can use it the same way you use GCC. 52 c/B of output over large buffers for planar data (at least if L2 cache or maybe L3 to keep up with memory bandwidth). 57x as fast (MSVC takes 2. So if you want to install GCC in UCRT64, use pacman -S mingw-w64-ucrt-x86_64-gcc, NOT pacman -S gcc. cpp export module building… For Windows nowadays, that means you can't use C++ if you need to support both MSVC and GCC (unless your C++ is just an inline wrapper over a C ABI - which has the advantage of being more usable by other languages). For windows-msvc, I believe you still need the C++ build tools even if you use lld rather than link. exe to be available and in PATH. GCC works with libstdc++ only(far as I know). For large binaries using LLVM bolt has proven to improve performance. Microsoft documentation for comment pragmas give this example: #pragma comment( lib, "emapi" ) From what I've read, this is an alternative way for the linker to include a library in your code instead of using a command line argument. The new ABI was introduced in GCC 5. When using GCC as a compiler you get a different set of warnings / errors when building vs when editing code in the IDE, which could be confusing. MSVC doesn't allow this kind of statement, so we were a bit puzzled. Now I'm concerned. The Atom is an in order processor. - In gcc it seems there is a frozen page for months about cxx-modules - Clang implements another older flavor but not sure about the C++20 thing. Oct 15, 2021 · GCC with LTO was running roughly 3 times faster than ICC without LTO. So does anyone have any up-to-date info on compiler performance on MSVC++ vs MinGW/ GCC? (Specifically the generated code) For C++, VS is pretty good. At the current state it's already a competent replacement to msys2(and to TDM-GCC if you know what it is). This means that you can completely avoid everything in userspace if you want and write a program in assembly directly, which can interface with the kernel and use the functionality of the operating system, without having to link against any userspace libraries. However back then, some distro/toolchain maintainers still set the default to the old ABI, so that produced binaries retained compatibility with system libraries. We measure two aspects of the compilers’ performance: The speed of compiled C/C++ code parallelized with OpenMP 4. It only attempts to compile these functions when it gets an actual data type in a call. Clang can be (and often is) built against the MinGW-W64 ecosystem in such a way that it's a drop-in replacement for MinGW gcc and g++ (i. MySQL Intel builds are much faster than GCC builds, at like, everything. Apr 22, 2016 · Hello, I have made my own measurements (on current master), comparing Visual Studio 2010 and 2017 and MinGw-w64 (build 4. But those are very outdated questions(2011). Yeah. 1 - a fast game engine for unified-memory platforms I have have a ray tracing project I like to use as a playground for squeezing performance out of C++ projects. I personally find this a little odd. , between 5x to 15x difference). Windows builds are up to 5% faster now compared to v6. But he says they can get it within 5 to 10% of the PCH performance. Visual C++ is an IDE that is designed to work with the Microsoft C++ compiler. I've also had to inline functions in order to make the compilers see they can constant-fold it entirely to almost no code (except MSVC, which still didn't optimize well 😿). If you care about performance you should make benchmarks and prove that in your use case for your platform the code you are using is faster. 16. And in those comparisons I’ve regularly been unable to produce the claimed results on Linux at all. x directives for multi-threading and vectorization. VS Code is more of a lightweight editor than a full IDE, but you can add a lot of features IDEs have through its plugins like Code Runner. Because it comes with many other tools like Visual Studio and MSBuild that I don’t need. It also makes the entire process more predictable, and your code more portable(!). Performance fixes (GhostRider): Fixed several performance bottlenecks introduced in v6. It's by no means a general statement on ICC's performance, but the results were sufficient for us to go ahead with GCC 4. The tool that triggers the build is actually the gcc crate (which has been renamed to cc recently). MinGW/GCC has much better standards compliance than msvc. In theory they all do the same thing but there are obviously internal differences between them. I will have actual compiler devs comment on it and possibly work on it (key word is knowing if they are working on it). So, basically this works on GCC 11, while MSVC complains that a "call to immediate function is not a constant expression". MSVC intrinsics for instance are not constexpr, but thanks to std::is_constant_evaluated they can be used in a constexpr functions. Hey, thanks a bunch for this! Currently I use Qt/MSVC, so I might try that experimental option. ** Briefly, during the deduction for partial ordering, before any comparison is done, reference types are replaced with the types referred to, and then top-level cv-qualifiers are stripped, so both const T& and T yield the same signature. There are also functions that semantically require being inlined, regardless of performance characteristics. If your project grows larger, and you want performance and strict adherence to the C++ standard, I think GCC is the way to go. MSVC can be installed on its own but the simplest installation is the one where you also install VS and this is the most straightforward way to get code up and running on Windows so if you're on Windows there really is no reason to not use MSVC. Nov 7, 2011 · MSVC has the huge advantage of coming with an IDE that has no equals under Windows, including debugger support. Like gcc and Clang for a start. Compile on both (and also Linux / gcc) to cross reference standards compliance and warnings etc. I want to compile from command line so that I can use any text editor I want. Clang can be made compatible with GCC (like on most platforms) or with MSVC. g. a few visits to godbolt would also tell you this. W/ msys2 you get the msys/mingw environment which adds some of the POSIX functionality windows is missing natively, making it easier to write things like you would on *nix systems instead of having to special case for windows. Since there doesn't seem to be any significant speed difference between the two compilers, what are the pros and cons of choosing one compiler over another? MSVC is separate from visual studio and you can use it with whatever IDE you want. That’s why I’m moving away from msvc. I am not aware of any performance differences caused by using the different compilers. 57 c/byte of output. on Windows, we have -msvc vs -gnu (vs -gnullvm); on Linux, we have mainly -gnu vs -musl, (there are many other environments too, mostly for specific hardware or embedded systems, such RFC: MSVC static vs import library naming We are deciding on the default library naming in build2 for the MSVC toolchain and I would like to hear what the C++ community thinks on this matter. 3 with GCC 7. Discussions, articles and news about the C++ programming language or programming in C++. But really despite using msvc is often a better choice on windows because so many library authors refuse to ship source code and ship precompiled msvc binaries. Well. exe , links some prebuilt binaries that targets mingw etc. There were some part where I used parallel threads which just worsened the performance to >35s. Those flags are mostly pulled from the CPUID feature bits from e. Leaves 1 and 0x80000001. never found a use case that would give initializer_list enough relevance to incorporate it in an API. Performance is one aspect, but I'd highly recommend supporting multiple compilers for their warnings/safety features. With gcc there's little more work - ie. VS Code also supports more languages I think. MSVC on the other hand will probably get full 3. If you're coding in standard C++ you should use neither. 1, and presumably it was made the default. First thing would be to have parsers implement the C++ language specification, but then there is the question of if different parsers will be able to understand each others' binary module interface files - so that you will still be able to use your clang tooling with a gcc build, or IntelliSense (based on EDG) with your MSVC build. Modules support is pretty buggy in clang and gcc (I haven't tried msvc modules). Everything just works and with zig build you get a dependency free native binary ready. I have project of mine that compiles on both GCC/G++ and Clang perfectly fine. Sticking to standards means you're independent from vendor specific idiosyncrasies, and the benefits of #pragma once over include guards are not huge. - Same for MSVC, it implements something more compliant, but not there yet Is there any available information on when to expect these features in these 3 big compilers? It's probably worth at least supporting MSVC as well, since it is excellent at warning about accidental type conversions. Microsoft doesn't market this possibility very well, but you can find an installer on this page if you unfold the section "Tools for Visual Studio". 5 support by the end of the decade at this rate. The compiler that is used to compile the source code to an executable file. Fixed overall GCC-compiled build performance, it's the same speed as MSVC build now. It should be noted that MinGw-w64 can be built with several options; among them one that defines exception model has severe impact on both performance and ability to catch software signals (such as access violations). 0 GCC build. The question is, will the purely performance portable one leave room for a lower level language (e. Even at -O2: Clang's loop unrolling attempts at -O2 are more aggressive than GCC's loop unrolling attempts at -O3. Clang has an edge over GCC in that it compiles both libc++ and libstdc++. gcc (GNU Compiler Collection) is a compiler commonly used in Linux environments, while the MSVC (MicroSoft Visual Compiler) mostly in Windows systems. So on Skylake, clang is 2. Clangd, Clang tidy and clang format don't have a gcc equivalent. Yes, working in Unreal its pretty much required, you can't start up your game in Debug, it will take 20 minutes. h is a C compatibility header and while you can technically use it, there's no reason to do so unless you're writing code that interfaces with C. GCC is "obviously" slower according the world out there that talks about GCC vs MSVC vs Intel. If you rank the resources contributed to each compiler ecosystem, MSVC comes top, then GCC + libstdc++, then clang + libc++. However, compiling with ClangCL takes much longer. e. In my test, I get a 40% speedup with ClangCL. 1. Visual Studio usually doesn't provide the latest version Note that VS tries to provide the latest version of Clang/LLVM in a timely manner, but we need to wait for the final release version, do installer work and run testing, and then we're subject to the latency in the VS release pipeline (after a change is merged, it takes a while before it appears in a VS Preview, and then more time before No. 18 on ICL. In gcc, this fails to build because test_func is implicitly defined and the actual definition of it conflicts with the compiler's definition. Additionally, there's almost no documentation (even manpages don't seem to exist) with this page being the only complete reference about the header. How to write standard-compliant C++ code that universally compiles. Cheers Sometimes a program is a lot faster when compiled with GCC, sometimes it's a lot faster with clang. Where I work, we build for windows with MSVC, Linux with GCC and AIX with xlC. And that unsurprisingly exactly matches C++ 20 and especially 23 implementation progress. Until you have made those tests to prove that, you should be writing code that is readable and easy to maintain. So it's a sliding scale. 000000" like you might expect. My recommendation is to use the same one that is used in the resource you are learning from or move to visual studio amd use a full blown ide. Take SDL2 for example: if you want to statically link on Windows with MSVC you have to build it yourself which is supposed to work but I haven't been able to accomplish this. GCC uses its own IR generation where Clang uses LLVM IR. c on Windows (MinGW) and on linux (GCC), produced assembly code is a bit different (length and some instructions, such as printf and printf@PLT), and afterwards only corresponding assemblers can generate executables (for instance, running mingw asm->exe fails on the assembly code generated on linux gcc). Until recently you couldn't mix MSVC versions either. Linux builds are up to 10% faster now compared to v6. It definitely has one of the best debuggers out here. Hi, I ran into an issue where the behaviour of forward declaration differs between MSVC and GCC. I feel as though inlining should be forced in cases like these. A place for all things related to the Rust programming language—an open-source systems language that emphasizes performance, reliability, and productivity. Gcc, mingw, clang and msvc can all be used. obj gets linked in), it is able to save significant time in the The best we had was MSVC safe iterators and GCC mudflap. *. Clang should also work as a compiler driver for GCC and libstdc++. It does sound like the best debugging tools are for GCC/Clang. Generally VS Code is better for smaller projects, while for full stack apps and the like you should use IDEs more. First all: prefer not to use MSYS at all!!! There are two much better options: Install the MSVC compiler without the Visual Studio IDE. The other compiler is most accurately described as GCC, it's totally free and open-source and the most widely used compiler in the world. The compilers probably just have different priorities, and full modules support probably isn't as important as other things, for example GCC supports the whole openmp 4. Well if I were to be releasing some generic container as part of an API -- say an improved std::unordered_map or something -- I definitely would add support for std::initializer_list constructors so as to make my users happy and not annoy them. Are there any good comparisons of LLVM vs GCC? Currently, my company is on GCC and I would like to consider moving to LLVM. Overall, there's obviously a big split between the Windows and Unix lands. I also still think we need a "debug-only" STL that can track things like std::array / std::vector [] access or even dangling "this" coming from smart pointers ->. The open source compilers Gcc and Clang have now taken the lead. GCC has been around a long time so it has had a lot of time to create a expansive list of compilation optimizations whereas clang could target the lowest hanging fruit of optimizations that make the largest This results in having to opt out of (on average) ~10 warnings on GCC, ~40 on Clang and ~0 on MSVC, and the majority of these are only because of third party dependencies. Linking is another story. on Windows, we have -msvc vs -gnu (vs -gnullvm); on Linux, we have mainly -gnu vs -musl, (there are many other environments too, mostly for specific hardware or embedded systems, such What if clang compiles faster than gcc becaues gcc has a lot more/harder optimizations going on that have minimal performance difference. And MSVC: /nologo /Ob1 /J /W3 /Gd /MT. However, if /arch is (strictly) less than AVX2, MSVC's countr_zero performs a runtime check to choose the implementation, while gcc and clang without -mbmi just use rep bsf, where rep prefix is ignored on non-BMI-supporting platforms but results in this instruction to be interpreted as tzcnt on BMI-supporting platforms, and insert zero check In the talk, the speaker mentions that the code generated from GCC is "perfect code", so I decided to take a look at what the different compilers do to it. MSVC produces significantly better binaries than gcc even with -March and -mtune enabled in gcc. I got curious as of how exactly GCC emits these strings. However, in comparison, there are several things you can see. edbpa lybilj ihust sffeg zsr nvlfec fjxw bnsxkur jcvk hicwd