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

[David Spickett via llvm-dev]

Though that might not work if you expect to get builtins for all the
llvm architectures you listed. Good chance it'll just build one but at
least you know where in the cmake the 64+32 decision is made and you
can dig from there.

On Wed, 1 Dec 2021 at 09:44, PoYao Chang via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>
>
> 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
>
> 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.2 -L/home/liuke.gehry/toolchain/x86_64-x86_64-gcc-830/sysroot/lib64/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
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev