GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Clang on its own can also be used as compiler in the normal GNU binutils based environments though, so the main difference lies in replacing binutils with LLVM based tools. Prebuilt docker linux images containing llvm-mingw are available from Docker Huband prebuilt toolchains both for use as cross compiler from linux, and for use on windows are available for download on GitHub.

The toolchains for windows come in 4 versions, one for each of the 4 supported architectures, but each one of them can target all 4 architectures. The toolchain can be reproducibly built into a Docker image, or be built and installed in the host environment. To reduce the size of the installation, removing some files that aren't necessary after building, run:.

Individual components of the toolchain can be re built by running the standalone shellscripts listed within build-all. You might run into issues building non-trivial projects. Since GNU binutils based mingw environments don't support this, there's no predecent for what command line parameters to use for this, and llvm-mingw produces debug info in DWARF format by default.

gcc use lld

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Latest commit 6ee98bd Apr 14, Installation Prebuilt docker linux images containing llvm-mingw are available from Docker Huband prebuilt toolchains both for use as cross compiler from linux, and for use on windows are available for download on GitHub.

Building from source The toolchain can be reproducibly built into a Docker image, or be built and installed in the host environment. To build and install all components, just do:. The windres replacement, llvm-rc, isn't very mature and doesn't support everything that GNU windres does. The toolchain defaults to using the Universal CRT which is only available out of the box since Windows 10, but can be installed on Vista or newer and defaults to targeting Windows 7.

These defaults can be changed in build-mingw-w This has no effect on code not using thread local variables. The runtime libraries libunwind, libcxxabi and libcxx also assume that the target is Windows 7 or newer. Address Sanitizer doesn't produce working backtraces for i Address Sanitizer requires using a PDB file for symbolizing the error location and backtraces.

The sanitizers are only supported on xGitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. LLVM 4. See also a PoC in If we can somehow also bring along the necessary mingw libraries when cross compiling and not just native targeting which rustup's mingw package is currently limited tothen that would enable rust cross compilation from linux out of the box, which would be a huge improvement over the existing situation where people get MinGW from their distro and then run into issues because distros almost always use an incompatible MinGW.

LLD is not a good candidate for natively targeting MSVC targets, due to several reasons, the primary reason being the lack of debuginfo support. Cross compiling to MSVC targets requires libraries that can't be redistributed so we can't support that out of the box anyway. The tracking issue for upgrading to LLVM 4. For the record lld is definitely not ready for Solaris targets.

But on Solaris, there's no reason that I'm aware of to use lld instead of the native ld instead. We've already been looking at what it would take to have rust use Solaris ld on Solaris instead of using gcc for linking. We now appear to be running on LLVM 4. What LLVM 4. With that change we wouldn't require an external linker in some scenarios like linking MUSL binaries or bare metal programs. I say some scenarios because most targets require linking to system libraries where you will run into the library search path problem I mentioned above.

For those targets, LLD won't work out of the box. It's not clear how and where to solve that problem and without a solution for that we can't switch to LLD for the most important tier 1 targets, which the reduces the appeal of embedding LLD into rustc in the first place. After all, some component of the toolchain has to embed them as we don't have any standard for the platforms to follow, and binutils is not a good golden source of this knowledge.

In that case, I believe clang snoops the OS name and hardcodes OS-specific conventions, which seems bad but probably unavoidable if one wants to distribute a single binary that runs on any Linux and doesn't need the system linker. I wasn't able to cross compile cross link? It seemed like lld only supports platform native formats. Tagging this as a performance bug, since according to LLD's benchmarks it seems to outperform GNU ld by a factor of ten, and linking performance is a large component of compiler speed currently.

Linking with LLD is much faster than bfd or gold, but I doubt that using it will significantly improve overall performance. Still I think this issue is important and should be a priority. And IME when I look at time-passes output linking is usually in the top three longest phases, significantly longer than most, so even cutting linking time in half would probably be a huge win especially for big things like Servo and rustc.

Good news for anybody interested in the obscure topic of cross linking from Linux to Windows.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Has anyone tried to use gold instead of ld? Although gold is part of the GNU binutils since a while, I have found almost no "success stories" or even "Howtos" in the Web.

At the moment it is compiling bigger projects on Ubuntu Here you can install and integrate it easily with the binutils-gold package if you remove that package, you get your old ld. Gcc will automatically use gold then.

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What does not work: It cannot compile kernel stuff and therefore no kernel modules. Ubuntu does this automatically via DKMS if it updates proprietary drivers like fglrx.

This fails with ld-gold you have to remove gold, restart DKMS, reinstall ld-gold.

gcc use lld

As it took me a little while to find out how to selectively use gold i. Though, AFAIK, it is possible to configure gcc during the build in a way that the option will not have any effect. As a Samba developer, I have been using the gold linker almost exclusively on Ubuntu, Debian, and Fedora since several years now. My assessment:. I have not used gold selectively, but have been using symlinks or the alternatives mechanism if the distribution provides it.

You could link ld to gold in a local binary directory if you have ld installed to avoid overwriting :. GitHub upstream. Tested on Ubuntu Some projects seem to be incompatible with gold, because of some incompatible differences between ld and gold.

DragonFlyBSD switched over to gold as their default linker. So it seems to be ready for a variety of tools. Learn more. Replacing ld with gold - any experience? Ask Question. Asked 9 years, 8 months ago. Active 6 months ago. Viewed 43k times. Are there any know bugs or problems?Command Line Options The linker supports a plethora of command-line options, but in actual practice few of them are used in any particular context.

For instance, a frequent use of ld is to link standard Unix object files on a standard, supported Unix system. On such a system, to link a file hello.

The command-line options to ld may be specified in any order, and may be repeated at will. Repeating most options with a different argument will either have no further effect, or override prior occurrences those further to the left on the command line of that option. Options which may be meaningfully specified more than once are noted in the descriptions below. Non-option arguments are objects files which are to be linked together. They may follow, precede, or be mixed in with command-line options, except that an object file argument may not be placed between an option and its argument.

If the linker can not recognize the format of an object file, it will assume that it is a linker script. This feature permits the linker to link against a file which appears to be an object or an archive, but actually merely defines some symbol values, or uses INPUT or GROUP to load other objects.

See section Command Language. For options whose names are a single letter, option arguments must either follow the option letter without intervening whitespace, or be given as separate arguments immediately following the option that requires them. Arguments to multiple-letter options must either be separated from the option name by an equals sign, or be given as separate arguments immediately following the option that requires them. Unique abbreviations of the names of multiple-letter options are accepted.These options come into play when the compiler links object files into an executable output file.

They are meaningless if the compiler is not doing a link step. A file name that does not end in a special recognized suffix is considered to name an object file or library. Object files are distinguished from libraries by the linker according to the file contents. If linking is done, these object files are used as input to the linker. If any of these options is used, then the linker is not run, and object file names should not be used as arguments.

See Overall Options. This option controls code generation of the link-time optimizer. By default the linker output is automatically determined by the linker plugin. For debugging the compiler and if incremental linking with a non-LTO object file is desired, it may be useful to control the type manually. In this case -fpic and -fpie are both disabled.

2019 LLVM Developers’ Meeting: A. Ganea “Optimizing builds on Windows”

In this case -fpic or -fPIC is preserved, but not enabled automatically. This allows to build shared libraries without position-independent code on architectures where this is possible, i. The sections containing intermediate code for link-time optimization are merged, pre-optimized, and output to the resulting object file. In addition, if -ffat-lto-objects is specified, binary code is produced for future non-LTO linking.

The object file produced by incremental linking is smaller than a static library produced from the same object files. At link time the result of incremental linking also loads faster than a static library assuming that the majority of objects in the library are used. When multiple object files are linked together the resulting code is better optimized than with link-time optimizations disabled for example, cross-module inlining happensbut most of benefits of whole program optimizations are lost.

During the incremental link by -r the linker plugin defaults to rel. To maintain whole program optimization, it is recommended to link such objects into static library instead. Alternatively it is possible to use H. Search the library named library when linking. The second alternative with the library as a separate argument is only for POSIX compliance and is not recommended. The -l option is passed directly to the linker by GCC.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. This is standarized in C Try to update your compiler, I'm using GCC 4. For portable code, the macros in inttypes. They expand to the correct ones for the platform. You can try settings of code::blockthere is a complier Learn more.

Printf long long int in C with GCC? Ask Question. Asked 7 years, 4 months ago. Active 8 days ago. Viewed k times. I get no warnings: iapple-darwinllvm-gcc Nov 27 '12 at I'm running gcc on windows x Ah, it's gcc version 4.

Thanks effeffe. Which version of Windows are you using? Active Oldest Votes. I agree to you and moderators too, but the SO isn't really for this type of thread So, Is it a non-standard way to do it in windows? Any other compiler may I know which fully supports and follows standard rules for windows x86? I just did that mistake. Can you please add a link to the changes log for GCC 4.

Did the latest GCC 4. I have just tried to download and install MinGW but it didn't update my compiler to version 4.

I have it, so yes. Maybe you're still using the old version someway. I think it could be that I'm using an old version of Windows and not the compiler.

I'll try with latest compiler anyway. Shayki Abramczyk Tommy Wang Tommy Wang 1. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.Knowing that threading implementation in this GCC build is pretty buggy see e. Deadlocks remain. I believe LLD is much better tested on Linux though and I presume they have no problems with this implementation.

This is why I've decided to file the bug here. To further clarify the situation I've modified Parallel. Thus build LLD works flawlessly with no deadlocks. I've mistested it since wrong libwinpthread I've also isolated failing code from llvm codebase. Attached partest.

gcc use lld

It doesn't deadlock when built with your gcc, but deadlocks when built with vanilla MSys2 gcc, see below, niXman confirmed this. Hm, it deadlocks for me even if built with no optimization. Did you run it sufficiently many times? What CPU are you on? I tried Sandy, vanilla variant deadlocks either with or with no optimization enabled. I have Windows 10 bit on both machines. We had a discussion about this problem on IRC and Kai said the second problem might not get fixed.

A thread sleeps on a CV and bumps the counter to one. Another thread calls ExitProcessterminating the first thread. Since the first thread has already been terminated, a deadlock occurs. This ticket contains two bugs, though.

Even Microsoft's own condition variable suffers from this problem. The following code effectively results in a crash on my Windows Whilst investigating, I did stumble across quite an old deadlock bug related to this implementation of pthread condition variable and basically the bug was closed as incorrect usage, i.

The best fix would be to fix the MinGW pthread implementation. Yes it has been reported here but apparently nobody has been working on it. Sorry for that. Well as no one has looked into this, I've taken a look and I think I have a fix and some minor improvements too. I think I'll need to test it a bit longer, but so far so good. It certainly does not deadlock in the various test cases and mostly fixes LLD.

However, there are still LLD deadlocks when running the LLD lit tests and I believe that these are actually related to LLD exit causing deadlock something else that I've had the misfortune of looking at.

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