使用无GCC的汇编LLVM/Clang
我一直在尝试从源和使用此脚本）。我正在使用GCC 11.2编译clang，该11.2本身也是由源构建的，因此位于我的系统（/scratch/opt/GCC-ML-11.2）上的非默认位置中。请注意，它仅与启用Multilib编译的GCC一起使用。
问题在于，我可以使用编译clang和clang ++二进制文件，如果我提供GCC位置如下：-GCC-ToolChain =/scratch/opt /GCC-ML-11.2.0。如果没有该标志，我会遇到链接器错误：
clang test.c -o test
/usr/bin/ld: cannot find crtbeginS.o: No such file or directory
/usr/bin/ld: cannot find -lgcc
/usr/bin/ld: cannot find -lgcc_s
我不明白为什么一个clang汇编的二进制文件需要针对某种GCC库链接，以及为什么Clang不提供crtbegins.o文件。
我还尝试使用LLVM链接器以及用于C ++测试应用程序的LLVM标准库，即，“ - FUSE-LD = lld = lld -stdlib = libc ++ 。这也没有帮助
。 Just 导出CXXFLAGS = -GCC-ToolChain =/scratch/opt/opt/gcc-ml-11.2.0，我不确定这是否是正确的方法。没有GCC安装的功能
？ 文件还需要GCC -Toolchain标志。
二进制 GCC
非常感谢您的帮助
！ maxbit
I have been trying to compile LLVM/clang from source, both by myself and using this script. I am compiling clang using gcc 11.2, which itself was also built from source, and hence resides in a non-default location on my system (/scratch/opt/gcc-ml-11.2). Note that it only works with a gcc that was compiled with multilib enabled.
The problem is that I can use the compiled clang and clang++ binaries only if I supply the gcc location as follows: --gcc-toolchain=/scratch/opt/gcc-ml-11.2.0. Without that flag, I run into linker errors:
clang test.c -o test
/usr/bin/ld: cannot find crtbeginS.o: No such file or directory
/usr/bin/ld: cannot find -lgcc
/usr/bin/ld: cannot find -lgcc_s
I do not understand why a clang compiled binary needs to link against some kind of gcc library and why clang does not supply the crtbeginS.O file.
I have also tried using the LLVM linker as well as the LLVM standard library for C++ test applications, i.e., "-fuse-ld=lld -stdlib=libc++. This did not help either.
While I could just export CXXFLAGS=--gcc-toolchain=/scratch/opt/gcc-ml-11.2.0, I am not sure whether this is the right approach. Shouldn't clang/LLVM be able to function without a gcc installation?
I have also tried using my clang installation with the --gcc-toolchain=/scratch/opt/gcc-ml-11.2.0 flag to compile clang again, but the new binary also requires the gcc-toolchain flag.
Should I just globally export the path to my gcc toolchain? Why is this necessary? Isn't clang a standalone compiler that - if supplied with the option to use its own standard library - does not require gcc?
Thank you very much for your help!
Best,
Maxbit
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