This article explains these 5 ways, which are writing different code, __attribute__, _Pragma, #pragma, and command line options. The Clang codebase is more As a beginner, how do I learn to win in "won" positions? Clang is more predictable, and usually it generates the code you expect. This page revisits the examples using recent versions of GCC … Software Engineering Stack Exchange is a question and answer site for professionals, academics, and students working within the systems development life cycle. Clang would do well to add hyphens to “pointer to integer”. As an example, take the code below, it’s a distilled summary illustrating the problem, and it took me a fair amount of time to work out why g++ was rejecting it. Do Genesis 1:1 and John 1:1 point to the same identical beginning? The Clang Static Analyzer is a source code analysis tool that finds bugs in C, C++, and Objective-C programs. RISC-V code quality issues (GCC vs Clang). ), why do you write Bb and not A#? e2.c:2:30: error: expected ‘;’ before ‘a’ Does the first postulate of special relativity imply constant speed of light? Back to top Why were the FBI agents so willing to risk the hostages' lives? It was first released in VC++ in 2002. A typical use of the message pragma is to display informational messages at compile time. For ARM the situation is ambiguous, often Clang optimizes better. But, the built in … whereas clang emits 87 lines of garbage starting with So some projects are switching from gcc to clang as default compiler. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Note that GCC 8 appears to have improved some messages, but it isn't a stable release yet. both are still different compilers though. It frequently produces much better error messages, especially for C++ templates. If you use a predefined macro in the message pragma, the macro should return a string. Project uses ncurses. There exist corporations whose legal departments only allow the latter. Project uses ncurses. Because clang got a LOT slower and GCC got a bit faster. According to more recent benchmarks, clang is faster than gcc on x86/64 in slightly over half tests (e.g. Note, however, that in this case it has … Marc Espie , clang vs gcc: waaaaaat? a lot of source codes only compile correctly with CC value set to clang . But Clang has excellent compile errors and warnings, and its static analysis is just superb. Absolutely not a flame war but would like to switch to clang in a project. Clang/LLVM code is human-readable, not just compiler-readable. What would you like to do? add-with-carry intrinsic functions __buildin_addc). typedef typename _Alloc::pointer pointer; However, it also has extensions which are not supported by GCC, but can be useful (e.g. * options) to enable VS-style formatting (instead of clang-format formatting). clang used to be incredibly fast and used little memory consumption, but recent versions have seen the compiler regress in both areas. Author: GCC's PCH mechanism (which is just a dump of the compiler memory image) is related, but is architecturally only able to read the dump back into the exact same executable as the one that produced it (it is not a structured format)." Clang/LLVM and GCC Community GCC Community We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. Where I work our code runs on both Linux and Windows, so we normally use four compilers (MSVC, icc and gcc producing various binaries, and clang periodically for linting). As it currently stands, this question is not a good fit for our Q&A format. On Windows, Visual Studio. Clang for Objective-C cloud be fully used for the production environment in 2009. Unlike Jerry Coffin, I find building GCC from source much harder than Clang. GCC uses a lot of heuristics. #include Again, the error messages are startingly useless in both cases. Note, however, that in this case it has suppressed the more informative error. Visual Studio is a little bit lagging but it's catching up. GCC has improved considerably since then. The quality of error messages has been the subject of jokes for decades. Cross compiling: Share compile steps between different target platforms? The only exception is the availability of SSE4.1 with 'penryn', compared to SSSE3 with 'core2'. On the same system, with clang 10.0.0.0, either -Wno-deprecated after -Wextra and -Wno-deprecated-copy after -Wextra work (apparently the option was added), and either of them before -Wextra fail. Clang tries to be compatible with GCC, but sometimes it just quietly ignores them. I would choose the default toolchain for the platform you are on. That means I can't really translate the umbrella header file. GCC only has a couple of comments in the source code mentioning "Penryn", and the associated code considers it to be the same as 'core2'. while clang produces E.g. This is clang-cl.exe. If you are using MSBuild projects, you can see a list of those via View->Clang IntelliSense Diagnostics Console ->View->ProjectStatus->CFLAGS (due to a bug in the Windows edit control, it may appear empty if CFLAGS is too long; copy-pasting it to notepad should … Star 2 Fork 0; Star Code Revisions 26 Stars 2. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Partager sur Twitter Partager sur Facebook Partager sur Pinterest Even small source code changes can make GCC generate a completely different output. GCC or clang are both great for C++ development as they are conforming C++14 implementations. Clang Static Analyzer¶. e1.c:2:33: error: called object type 'int' is not a function or function pointer was all more tightly integrated. Clang for Objective-C cloud be fully used for the production environment in 2009. It is often repeated that the Clang compiler produces far superior diagnostics to GCC. Clang has much better error reporting. open64 had link-time optimization in the early 2000s. If you want to do compiler research, or just curious about how it works, you will find Clang/LLVM source code more accessible. both gcc and clang are C compilers. Did someone had same issues or knows how to fix this problem? Also, I'd suggest changing the clang-arm to clang-x86, as we don't yet support clang-arm. As long as clang-x86, clang-x64, or gcc-x86, or gcc-x64 intelliSense mode is used, __attribute__ should not be squiggled. Summary: compile with Clang when you develop the program, and with GCC for the final build (but make sure that its faster and doesn't break). How do I find out the REAL title of a given video game? Isn't there a chicken-and-egg issue since GCC is written in C++ itself? typedef typename _Alloc::pointer pointer; gcc is a tad better by virtue of printing the second error message which at least hints of the real problem, but neither compiler tell us what the problem is: “missing comma”. E.g. While calling make (with invokes gcc-7.2), clang throws the error: clang: error: unsupported argument '--gstabs' to option 'Wa,'. To start viewing messages, select the forum that you want to visit from the selection below. As far as technical advantaged are concerned, LLVM is much cleaner and easier to work with, gives better error messages, is better at spotting valid but problematic code, etc. Clang 3.3 fully supported C++ 11, Clang 3.4 fully supported C++ 14, and Clang 5 fully supported C++ 17, and all were significantly ahead of GCC at that time. Moving on with a missing opening parenthesis: The received conventional wisdom that I get is that for C/C++, CLANG/LLVM give the nicest errors, and the Intel compiler suite produces the best optimized code. The procedure from Clang's Getting Started page always worked for me. Clang will initialize variables to a poison pattern, but Linus Torvalds would that a given value will behave predictably seems like a terrible mistake. It's built primarily as a set of libraries, so there are quite a few other projects (e.g., code analyzers) that use the same front-end, understand the same inputs, etc. On Linux, GCC. Suppressing Warnings in GCC and Clang. marklacey 13 hours ago. For example the Expressive Diagnostics page shows examples where Clang's diagnostics were indeed superior to GCC 4.2, which was released in 2007. clang vs gcc linking problem: Artifex Maximus: 2/24/12 10:33 PM: Hello! Last active Oct 6, 2020. GNU_SOURCE variable does not play nicely with clang. gcc is a tad better by virtue of printing the second error message which at least hints of the real problem, but neither compiler tell us what the problem is: “missing comma”. > GNU_SOURCE variable does not play nicely with clang. If you feel that this question can be improved and possibly reopened, Software Engineering Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. "Clang can serialize its AST out to disk and read it back into another program, which is useful for whole program analysis. uct, or union type Today (8/11/2011), GCC supports a lot more of the C++0x features than Clang does. It only takes a minute to sign up. Yet it’s a clear violation of C99’s paragraph 7.26.3. GCC has been preparing to use C + + for modularity until 5.0, expecting a breakthrough in GCC's 5.0 to make up for a short board that cannot be modularized. How could a 6-way, zero-G, space constrained, 3D, flying car intersection work? If you've ever had to use GCC and Xcode vs Visual Studio back in the day, you'll likely have seen how Visual Studio's code completion, debugging, etc. C++ doesn’t fare any better: This should get addressed by #4271. GCC is nearly standard in Linux world, and it adds a lot of non-standard features which are widely used in Linux software. End gives it some extra flexibility in how you generate code from it a?... Answer really, because as of today ( 8/11/2011 ), GCC supports a lot of non-standard features which widely! Most/All BSD variants ) clang and students working within the time frame specified to! 2012 ) done any serious benchmarking of these compilers, ARM, AMD, students! Declares the object as const suppressed the more informative error over half tests ( e.g the procedure from 's... Community also, I 'd suggest changing the clang-arm to clang-x86, clang-x64, or just about! Frequently produces much better error reporting half tests ( e.g it sometimes produced faulty code do... 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