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

[刘可 via llvm-dev]

Thanks for your reply. It does work!
On Wed, Dec 1, 2021, 17:42 <david.spickett at linaro.org> wrote:
Since your default target will be 64 bit I think you can set
COMPILER_RT_DEFAULT_TARGET_ONLY and it will just build 64 bit. If you look
for that option name in compiler-rt/cmake/base-config-ix.cmake you'll see a
check for it, then if it's not set it checks flags for both 64 and 32 bit,
which is what leads to trying to build both.
if(COMPILER_RT_DEFAULT_TARGET_ONLY)
add_default_target_arch(${COMPILER_RT_DEFAULT_TARGET_ARCH})
elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "i[2-6]86|x86|amd64")
if(NOT MSVC) test_target_arch(x86_64 "" "-m64") test_target_arch(i386
__i386__ "-m32") I have not tested it myself but maybe that helps. On Wed,
1 Dec 2021 at 06:29, 刘可 via llvm-dev 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 > ^~~~~~~~~~~~~ > 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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