I'm trying to build LLVM on Windows 10 for x86_64. The cmake cmdline I used is c:\cmake-3.8.0-rc1-win64-x64\bin\cmake.exe -DLLVM_TARGETS_TO_BUILD=x86_64 -G "Visual Studio 14" . And this ultimately gives me: llvm-build: error: invalid target to enable: 'x86_64' (not in project) The source I'm trying to build is the llvm-3.8.0.src.tar.xz I got from http://releases.llvm.org/download.html If I don't specify LLVM_TARGETS_TO_BUILD or I set it to "X86", cmake completes fine, and I can build the solution (but it gives me 32-bit binaries) What am I doing wrong? John -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20170227/06815793/attachment.html>
Hi John, On 27 February 2017 at 18:57, John Cortell via llvm-dev <llvm-dev at lists.llvm.org> wrote:> If I don't specify LLVM_TARGETS_TO_BUILD or I set it to "X86", cmake > completes fine, and I can build the solutionX86 is definitely what you should be using (both 32-bit and 64-bit x86 backends share the code in lib/Target/X86, which is the key point CMake is looking for).> (but it gives me 32-bit binaries)I assume this means that when you run the Clang you've just built it defaults to producing 32-bit binaries? If so, on *NIX platforms you override the default target with LLVM_DEFAULT_TARGET_TRIPLE. I'm not *sure* that'll work on Windows (which has its own weird driver on top of Clang), but as far as I can tell from here it behaves as I'd expect. If so you want to set it to something like "x86_64-pc-windows-msvc18.0.0" for 64-bit default. clang-cl also seems to accept -m32 and -m64 options as overrides, which may or may not be useful to you. Probably a bit hacky to put into a build system since MSVC itself won't accept them. Cheers. Tim.
Hi John, [Adding llvm-dev again; best to keep these things in the open so they show up in future searches]. On 27 February 2017 at 19:46, John Cortell <john.cortell at gmail.com> wrote:> After building the solution cmake gave me (with X86), I got those libraries > I wanted, but they appear to be 32-bit. I need 64-bit versions.Ah, that was my second guess. My limited reading suggests that Windows has completely separate compilers to produce x64 and x32 libraries/binaries. A bit of grubbing around the internet suggests CMake exposes this with the CMAKE_GENERATOR_PLATFORM variable, and -A on the command line. So I'd suggest: c:\cmake-3.8.0-rc1-win64-x64\bin\cmake.exe -DLLVM_TARGETS_TO_BUILD=x86_64 -G "Visual Studio 14" -A Win64 (plus a path to the source). That last argument is a bit of a guess, but fits in with documentation at https://cmake.org/cmake/help/v3.8/generator/Visual%20Studio%2014%202015.html (for example). Hope this works out for you. Tim.
Thanks! That should get me on the right track. Direct reply was accidental. Thanks for putting me back on the list :-) I'll repost with details once I've got it working. On Mon, Feb 27, 2017 at 10:00 PM, Tim Northover <t.p.northover at gmail.com> wrote:> Hi John, > > [Adding llvm-dev again; best to keep these things in the open so they > show up in future searches]. > > On 27 February 2017 at 19:46, John Cortell <john.cortell at gmail.com> wrote: > > After building the solution cmake gave me (with X86), I got those > libraries > > I wanted, but they appear to be 32-bit. I need 64-bit versions. > > Ah, that was my second guess. My limited reading suggests that Windows > has completely separate compilers to produce x64 and x32 > libraries/binaries. A bit of grubbing around the internet suggests > CMake exposes this with the CMAKE_GENERATOR_PLATFORM variable, and -A > on the command line. So I'd suggest: > > c:\cmake-3.8.0-rc1-win64-x64\bin\cmake.exe > -DLLVM_TARGETS_TO_BUILD=x86_64 -G "Visual Studio 14" -A Win64 > > (plus a path to the source). That last argument is a bit of a guess, > but fits in with documentation at > https://cmake.org/cmake/help/v3.8/generator/Visual% > 20Studio%2014%202015.html > (for example). > > Hope this works out for you. > > Tim. >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20170227/cde348d2/attachment.html>
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