| commit | 062cfada643c1aa48a1bb81894e2920d390fe8cf | [log] [tgz] |
|---|---|---|
| author | Fangrui Song <i@maskray.me> | Tue Feb 27 16:32:53 2024 -0800 |
| committer | GitHub <noreply@github.com> | Tue Feb 27 16:32:53 2024 -0800 |
| tree | c614265ec4b33ffeb05a33e73af77506e249110d | |
| parent | d699d9d609a24d80809df15efe47ac539da90e93 [diff] |
[builtins] Disable COMPILER_RT_CRT_USE_EH_FRAME_REGISTRY by default (#83201)
Most of GCC's Linux targets have a link spec
`%{!static|static-pie:--eh-frame-hdr}` that doesn't pass --eh-frame-hdr
for `-static` links. `-static` links are supposed to utilize
`__register_frame_info` (called by `crtbeginT.o`, not by crtbegin.o or
crtbeginS.o) as a replacement.
compiler-rt crtbegin (not used with GCC) has some ehframe code, which is
not utilized because Clang driver unconditionally passes --eh-frame-hdr
for Linux targets, even for -static. In addition, LLVM libunwind
implements `__register_frame_info` as an empty stub.
Furthermore, in a non-static link, the `__register_frame_info`
references can cause an undesired weak dynamic symbol.
For now, just disable the config by default.
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