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

Mon Nov 29 18:23:13 PST 2021

Or how to disable 'multilib' during building llvm13? I only apply it in the
64bit system.
On Tue, Nov 30, 2021, 10:14 <liuke.gehry at bytedance.com> wrote:
I don't install 'multilib' in my debian system, that's why I want to
specify my gcc8 toolchain.
Actually, I want to build llvm13 with gcc8 toolchain instead of a host
environment. What should be my correct steps?
On Tue, Nov 23, 2021, 13:02 <gluokai at gmail.com> wrote:
You should check multilib support on your debian system. I don't think gcc
has `sys/cdefs.h` packaged. On Tue, Nov 23, 2021 at 11:14 AM 刘可 via
llvm-dev wrote: > > 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 > ^~~~~~~~~~~~~ > 1 error generated. > > It still includes system
headers from "/usr/include". > On Mon, Nov 22, 2021, 21:31 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 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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