Building on msys ? about llvm-mingw HOT 8 CLOSED

It's not supported out of the box as is on the master branch, but I have tried this once a couple months ago.

I do provide prebuilt binaries for all of this, here on github, but if you still want to try to build it yourself:

I've got a branch named msys-build that I just rebased (untested); the first two commits of it should be relevant, the third one shouldn't be necessary any longer but you can test it if you want to.

I don't remember exactly what the errors were, but it's absolutely essential that you use the mingw flavoured version of cmake from msys2, not the msys2 one. The first commit on that branch adds an option to the cmake invocations to pass -G "MSYS Makefiles" to choose that generator. (And since the argument MSYS Makefiles needs to be written like that, with a space in it, it's pretty messy to pass through other shell variables with lists of flags, especially as long as I've tried to keep the shell scripts as plain posix shell scripts.)

If those steps don't help, can you have a look in CMakeFiles/CMakeError.log?

from llvm-mingw.

the build goes further but fails :

CMake Error at cmake/modules/AddLLVM.cmake:657 (install):
  install Library TARGETS given no DESTINATION!
Call Stack (most recent call first):
  tools/lto/CMakeLists.txt:19 (add_llvm_library)

here's the log : https://gist.github.com/jcelerier/dea2e62b0c6f002ed2af5d2a531d3821

from llvm-mingw.

Strange... I don't remember seeing exactly that one. I wonder if it matters that you run build-all.sh with a relative path llvm as the intended destination for the install, does it help if you run ./build-all.sh /some/absolute/path?

from llvm-mingw.

no, it stops due to the same error :( ah well, I'll just rebuild from a linux host for now

from llvm-mingw.

/usr/lib/gcc/x86_64-pc-msys/7.3.0/lto-wrapper.exe

It should be mingw-w64 based compiler but in your case it's Cygwin based GCC.

Run:

pacman -S --needed mingw-w64-x86_64-toolchain

And make sure to start MinGW64 shell.

from llvm-mingw.

MinGW shells use UNIX paths. Do you have mingw based cmake?

pacman -S --needed mingw-w64-x86_64-cmake

Also try clearing CMake cache with:

cd llvm
ninja clean

from llvm-mingw.

sorry @mati685, it was indeed the wrong cmake... I hoped that no one would see it :p

it seems that it's started building ! I'm closing this issue and will open another one if I stumble on further compilation errors but at least the configuration stage passed.

from llvm-mingw.

Hmm, if you were using my msys-build branch in a mingw-targeting shell, it should have tried to use cmake with CMAKE_GENERATOR="MSYS Makefiles", and that only works with the mingw based cmake, not with the msys based cmake.

from llvm-mingw.