lancethepants added a comment. 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? 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! 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. -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 needed it. Kind of unintuitive, but that should hopefully get you going. 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