[llvm-dev] How can I build LLVM with my gcc toolchain exactly

[Nemanja Ivanovic via llvm-dev]

This is just a guess as you haven't included the full invocation or output
of the failing command, but perhaps you need -DGCC_INSTALL_PREFIX=
/home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830

On Fri, Nov 19, 2021 at 8:38 PM 刘可 via llvm-dev <llvm-dev at lists.llvm.org>
wrote:

> Hi, I'm from ByteDance.
> I was confused when I built LLVM with gcc toolchain.
>
> ===================================================================
> Here is my first command:
>
> CXX=/home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/bin/g++ \
> CC=/home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/bin/gcc \
> cmake -G Ninja \
> -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;lld;lldb;openmp" \
> -DLLVM_ENABLE_RUNTIMES="compiler-rt;libcxx;libcxxabi;libunwind" \
> -DLLVM_TARGETS_TO_BUILD="X86;ARM;AArch64" \
> -DCMAKE_BUILD_TYPE=Release  \
> -DLLVM_BUILD_LLVM_DYLIB=ON \
> -DLLVM_LINK_LLVM_DYLIB=ON \
> -DCMAKE_CXX_FLAGS="-Wl,-rpath
> /home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/lib64 -Wl,-rpath
> /home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/sysroot/lib64
> -Wl,-dynamic-linker
> /home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/sysroot/lib64/
> ld-linux-x86-64.so.2
> -I/home/liuke.gehry/toolchain/x86_64-x86_64-gcc-494/sysroot/usr/include" \
> ../llvm
>
> result:
> /usr/include/features.h:364:12: fatal error: 'sys/cdefs.h' file not found.
> ===================================================================
>
> ===================================================================
> I tried to solve it by ’-I‘. But it failed.
>
> Here is my second command:
>
> CXX=/home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/bin/g++ \
> CC=/home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/bin/gcc \
> cmake -G Ninja
> -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;lld;lldb;openmp" \
> -DLLVM_ENABLE_RUNTIMES="compiler-rt;libcxx;libcxxabi;libunwind" \
> -DLLVM_TARGETS_TO_BUILD="X86;ARM;AArch64" \
> -DCMAKE_BUILD_TYPE=Release  \
> -DLLVM_BUILD_LLVM_DYLIB=ON \
> -DLLVM_LINK_LLVM_DYLIB=ON \
> -DCMAKE_CXX_FLAGS="-Wl,-rpath
> /home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/lib64 -Wl,-rpath
> /home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/sysroot/lib64
> -Wl,-dynamic-linker
> /home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/sysroot/lib64/
> ld-linux-x86-64.so.2
> -I/home/liuke.gehry/toolchain/x86_64-x86_64-gcc-494/sysroot/usr/include" \
> ../llvm
>
> result:
> /usr/include/features.h:364:12: fatal error: 'sys/cdefs.h' file not found.
> $ ls
> /home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/sysroot/usr/include/sys/cdefs.h
> toolchain/x86_64-x86_64-gcc-830/sysroot/usr/include/sys/cdefs.h
>
> 'sys/cdefs.h' exists in gcc toolchain,
> ===================================================================
> Looking forward to your reply. Thanks!
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