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

[刘可 via llvm-dev]

Thanks for your reply! But it still does not work.

Host environment：debian9    gcc6.3
My toolchain: gcc8.3

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
-DGCC_INSTALL_PREFIX=/home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830
-DCMAKE_CXX_LINK_FLAGS="-Wl,-rpath
/home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/lib64
-L/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
-L/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
-L/home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/sysroot/lib64/
ld-linux-x86-64.so.2" ../llvm

Info:
[99/302] Building C object
CMakeFiles/clang_rt.builtins-i386.dir/floatsidf.c.o
FAILED: CMakeFiles/clang_rt.builtins-i386.dir/floatsidf.c.o
/home/liuke.gehry/llvm/llvm-project/build_13_release/./bin/clang
--target=x86_64-unknown-linux-gnu -DVISIBILITY_HIDDEN  -O3 -DNDEBUG    -m32
-std=c11 -fPIC -fno-builtin -fvisibility=hidden -MD -MT
CMakeFiles/clang_rt.builtins-i386.dir/floatsidf.c.o -MF
CMakeFiles/clang_rt.builtins-i386.dir/floatsidf.c.o.d -o
CMakeFiles/clang_rt.builtins-i386.dir/floatsidf.c.o   -c
/home/liuke.gehry/llvm/llvm-project/compiler-rt/lib/builtins/floatsidf.c
In file included from
/home/liuke.gehry/llvm/llvm-project/compiler-rt/lib/builtins/floatsidf.c:16:
In file included from
/home/liuke.gehry/llvm/llvm-project/compiler-rt/lib/builtins/fp_lib.h:23:
In file included from
/home/liuke.gehry/llvm/llvm-project/compiler-rt/lib/builtins/int_lib.h:93:
In file included from
/data00/home/liuke.gehry/llvm/llvm-project/build_13_release/lib/clang/13.0.1/include/limits.h:21:
In file included from /usr/include/limits.h:25:
/usr/include/features.h:364:12: fatal error: 'sys/cdefs.h' file not found
#  include <sys/cdefs.h>
           ^~~~~~~~~~~~~
1 error generated.

It still includes system headers from "/usr/include".
On Mon, Nov 22, 2021, 21:31 <nemanja.i.ibm at gmail.com> wrote:
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!
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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