[PATCH] D96070: [clang] [driver] Enable static linking to libc++

[Fangrui Song via Phabricator via cfe-commits]

MaskRay requested changes to this revision.
MaskRay added a comment.
This revision now requires changes to proceed.

It is difficult for clang driver to make the decision because libc++ has multiple C++ ABI implementations as @mstorsjo said.

Persoanlly I use:

`clang++ -stdlib=libc++ -static-libstdc++ -nostdlib++ a.cc -Wl,--push-state,-Bstatic -lc++ -lc++abi -Wl,--pop-state -pthread`

This is still a bit inferior because there is a duplicate -lc++ passed by the driver.

Dynamically link against libc++.so (which depends on libc++abi.so) (additionally specify -pthread if threads are used):
`clang++ -stdlib=libc++ -nostdlib++ a.cc -lc++ -lc++abi` (clang -stdlib=libc++ a.cc -lc++ -lc++abi does not pass -lm to the linker.)
Omitting `-lc++abi` most works, but can fail if your program reference some definitions in `<exception> <stdexcept>` directly and you are using gold or LLD.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D96070/new/

https://reviews.llvm.org/D96070