[llvm-bugs] [Bug 25185] -nostdlib -rtlib=compiler_rt fails, no mechanism to link libc.so

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=25185

Fangrui Song <i at maskray.me> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |i at maskray.me
         Resolution|---                         |FIXED

--- Comment #1 from Fangrui Song <i at maskray.me> ---
-rtlib= doesn't append an arg by itself. It changes the selected
libgcc/compiler-rt builtin file when -nodefaultlibs (implied by -nostdlib) is
used.

% clang -rtlib=libgcc --print-libgcc-file-name
/usr/lib/gcc/x86_64-linux-gnu/8.0.1/libgcc.a
% clang -rtlib=compiler-rt --print-libgcc-file-name
/home/ray/llvm/Release/lib/clang/9.0.0/lib/linux/libclang_rt.builtins-x86_64.a

> gcc -nostdlib t.c -lgcc
> gcc -nostdlib t.c `gcc -print-file-name=libgcc.a`

The counterpart is: clang -nostdlib `clang -rtlib=compiler-rt
--print-libgcc-file-name`
The compiler-rt builtin library doesn't use the name "libgcc.a" so
-print-file-name=libgcc.a doesn't work...

> https://reviews.llvm.org/D10049
Implemented by D31447

> https://reviews.llvm.org/D10050
Fixed

> https://reviews.llvm.org/D10051
Implemented by D25338

> https://reviews.llvm.org/D10052
May be not really necessary because --print-libgcc-file-name does the job..

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