[libcxx-commits] [libcxx] [libc++] Remove explicit mentions of __need_FOO macros (PR #119025)

[Louis Dionne via libcxx-commits]

ldionne wrote:

Thanks for the steps, I followed exactly that but I still get:

```
CMake Error at /usr/share/cmake-3.28/Modules/CMakeTestCCompiler.cmake:67 (message):
  The C compiler

    "/usr/bin/clang-19"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: '/llvm-project/build/CMakeFiles/CMakeScratch/TryCompile-w2zQf9'

    Run Build Command(s): /usr/bin/ninja -v cmTC_5116d
    [1/2] /usr/bin/clang-19 --sysroot=/sysroot-x86_64-linux-gnu    -MD -MT CMakeFiles/cmTC_5116d.dir/testCCompiler.c.o -MF CMakeFiles/cmTC_5116d.dir/testCCompiler.c.o.d -o CMakeFiles/cmTC_5116d.dir/testCCompiler.c.o -c /llvm-project/build/CMakeFiles/CMakeScratch/TryCompile-w2zQf9/testCCompiler.c
    [2/2] : && /usr/bin/clang-19 --sysroot=/sysroot-x86_64-linux-gnu   CMakeFiles/cmTC_5116d.dir/testCCompiler.c.o -o cmTC_5116d   && :
    FAILED: cmTC_5116d
    : && /usr/bin/clang-19 --sysroot=/sysroot-x86_64-linux-gnu   CMakeFiles/cmTC_5116d.dir/testCCompiler.c.o -o cmTC_5116d   && :
    /usr/bin/ld: cannot find Scrt1.o: No such file or directory
    /usr/bin/ld: cannot find crti.o: No such file or directory
    /usr/bin/ld: cannot find crtbeginS.o: No such file or directory
    /usr/bin/ld: cannot find -lgcc: No such file or directory
    /usr/bin/ld: cannot find -lgcc_s: No such file or directory
    /usr/bin/ld: cannot find -lc: No such file or directory
    /usr/bin/ld: cannot find -lgcc: No such file or directory
    /usr/bin/ld: cannot find -lgcc_s: No such file or directory
    /usr/bin/ld: cannot find crtendS.o: No such file or directory
    /usr/bin/ld: cannot find crtn.o: No such file or directory
    clang-19: error: linker command failed with exit code 1 (use -v to see invocation)
    ninja: build stopped: subcommand failed.
```


https://github.com/llvm/llvm-project/pull/119025