smeenai added a comment. In D93164#3252509 <https://reviews.llvm.org/D93164#3252509>, @lancethepants wrote:
> In D93164#3250945 <https://reviews.llvm.org/D93164#3250945>, @andrew-wja > wrote: > >> In D93164#3048130 <https://reviews.llvm.org/D93164#3048130>, @lancethepants >> wrote: >> >>> In D93164#2653067 <https://reviews.llvm.org/D93164#2653067>, @mgorny wrote: >>> >>>> This change breaks cross-compilation now, as it tries running an >>>> executable built for the target system: >>>> >>>> FAILED: tools/clang/lib/Tooling/ASTNodeAPI.json >>>> cd /home/mgorny/llvm-project/build.arm64/tools/clang/lib/Tooling && >>>> /home/mgorny/llvm-project/build.arm64/bin/clang-ast-dump >>>> --skip-processing=0 >>>> --astheader=/home/mgorny/llvm-project/build.arm64/tools/clang/lib/Tooling/ASTTU.cpp >>>> -I /home/mgorny/llvm-project/build.arm64/lib/clang/13.0.0/include -I >>>> /home/mgorny/llvm-project/llvm/../clang/include -I >>>> /home/mgorny/llvm-project/build.arm64/tools/clang/include -I >>>> /home/mgorny/llvm-project/build.arm64/include -I >>>> /home/mgorny/llvm-project/llvm/include -I >>>> /sysroot/arm64/usr/include/c++/v1 -I /usr/lib/clang/11.0.1/include -I >>>> /sysroot/arm64/usr/include --json-output-path >>>> /home/mgorny/llvm-project/build.arm64/tools/clang/lib/Tooling/ASTNodeAPI.json >>>> /bin/sh: /home/mgorny/llvm-project/build.arm64/bin/clang-ast-dump: Exec >>>> format error >>>> >>>> I guess you can look at TableGens how to correctly generate and use host >>>> executables. >>> >>> I am now running into this error now that clang13 has released. I cannot >>> figure a way around this. I do not see any cmake options similar to the >>> tablegens that allow you to specify the binary for the build system. Am I >>> missing something or is clang13 just broken for cross compilation? >> >> Another confirmation that this change has broken cross compilation. I have >> tried setting both `-DCLANG_TOOLING_BUILD_AST_INTROSPECTION=OFF` and >> `-DCMAKE_CROSSCOMPILING=ON` separately and in combination. This means that >> LLVM cannot be cross compiled for AArch64, which is a pretty serious problem! > > So I did find a solution. Maybe somewhere else in the forums or on irc. Can't > remember for sure. > > -DCMAKE_SYSTEM_NAME="Linux" > Add this is well to your cmake invocation. For some reason this triggers in > cmake that we are cross-compiling. Why -DCMAKE_CROSSCOMPILING=ON is > insufficient I have no idea why. I'm compiling on linux for linux, didn't > think I'd need it. Kind of unintuitive, but that should hopefully get you > going. I believe the relevant bit of CMake logic is https://gitlab.kitware.com/cmake/cmake/-/blob/a2e42a577b08dc65ba801e18e5c8be163df83455/Modules/CMakeDetermineSystem.cmake#L136-158. If `CMAKE_SYSTEM_NAME` isn't set, it'll set `CMAKE_CROSSCOMPILING` to `FALSE` internally. Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D93164/new/ https://reviews.llvm.org/D93164 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
