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sternenseemann 3530837417 llvmPackages*.clang: fix linker invocation with LLVMgold plugin
When using GNU binutils, clang passes the LLVMgold.so plugin to the
linker for certain operations that require special support in the linker
like doing link time optimization (LTO). When passing the plugin to the
linker's command line, clang assumes that llvm and itself are installed
in the same prefix and thus `/path/to/clang/bin/../lib/LLVMgold.so` is
the plugin.

Since we install clang and llvm to separate store paths, this assumption
does not hold. When clang-unwrapped only had a single output, we worked
around this issue by symlinking `$out/lib/LLVMgold.so` to
`${llvm}/lib/LLVMgold.so`. However since we split all llvm packages into
multiple outputs clang's `$out` no longer has a lib directory and clang
can't discover clangs lib output on its own. As a result LTO was broken.

Instead of introducing yet another hack and having a symlink to
LLVMgold.so in `$out/lib` (despite having `$lib/lib` as well), we patch
clang to use a hard coded path to `${libllvm.lib}/lib` for discovering
`LLVMgold.so`.

Resolves #123361.
2021-05-18 16:15:03 +02:00
..
bintools treewide: Try to make a few bootstrapping things more consistent 2021-05-12 00:14:56 +00:00
clang llvmPackages*.clang: fix linker invocation with LLVMgold plugin 2021-05-18 16:15:03 +02:00
compiler-rt Merge pull request #123103 from sternenseemann/compiler-rt-resources 2021-05-15 12:06:57 -07:00
libcxx llvmPackages: Fix more inconsistencies 2021-05-12 00:16:11 +00:00
libcxxabi llvmPackages: Fix more inconsistencies 2021-05-12 00:16:11 +00:00
libunwind llvmPackages: Fix more inconsistencies 2021-05-12 00:16:11 +00:00
lld llvmPackages: Fix more inconsistencies 2021-05-12 00:16:11 +00:00
lldb llvmPackages: Fix more inconsistencies 2021-05-12 00:16:11 +00:00
llvm llvmPackages: Fix more inconsistencies 2021-05-12 00:16:11 +00:00
openmp llvmPackages: Fix more inconsistencies 2021-05-12 00:16:11 +00:00
default.nix Merge pull request #123103 from sternenseemann/compiler-rt-resources 2021-05-15 12:06:57 -07:00