[llvm-dev] How to avoid building builtin files with '-m32' during building LLVM?

PoYao Chang via llvm-dev
Wed, 01 Dec 2021 09:44:20 -0000

> From: PoYao Chang <rzhboyao at gmail.com>
> Subject: Re: [llvm-dev] How can I build LLVM with my gcc toolchain exactly
> Date: November 24, 2021 at 1:06:21 AM GMT+8
> To: llvm-dev at lists.llvm.org
>
> Give “-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON” a try.
https://lists.llvm.org/pipermail/llvm-dev/2021-November/153909.html
<https://lists.llvm.org/pipermail/llvm-dev/2021-November/153909.html>

Have you tried it as I told you a week ago.

> On Dec 1, 2021, at 2:29 PM, 刘可 via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
>
> Hi, I got an error when I specified gcc8.3 toolchain to build LLVM13. Here
is my host environment:
> Debian9
> gcc6.3
> Manully built toolchain: gcc8.3
>
>
==============================================================================================>
Here is my 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_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
<http://ld-linux-x86-64.so/>.2
-L/home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/sysroot/lib64/ld-linux-x86-64.so
<http://ld-linux-x86-64.so/>.2" ../llvm
> $ ninja
>
> [99/302] Building C object
CMakeFiles/clang_rt.builtins-i386.dir/floatsisf.c.o
> FAILED: CMakeFiles/clang_rt.builtins-i386.dir/floatsisf.c.o
> /home/liuke.gehry/llvm/llvm-project/build_with_gcc/./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/floatsisf.c.o -MF
CMakeFiles/clang_rt.builtins-i386.dir/floatsisf.c.o.d -o
CMakeFiles/clang_rt.builtins-i386.dir/floatsisf.c.o   -c
/home/liuke.gehry/llvm/llvm-project/compiler-rt/lib/builtins/floatsisf.c
> In file included from
/home/liuke.gehry/llvm/llvm-project/compiler-rt/lib/builtins/floatsisf.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_with_gcc/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.
>
==============================================================================================>
> I know I can solve it through 'apt install'. But I do not need
32-bits binary . How can I disable '-m32' when building builtins? Or is
it a necessary process?
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

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