[builtins] Disable COMPILER_RT_CRT_USE_EH_FRAME_REGISTRY by default #83201
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Most of GCC's Linux targets have a link spec
%{!static|static-pie:--eh-frame-hdr}
that doesn't pass --eh-frame-hdrfor
-static
links.-static
links are supposed to utilize__register_frame_info
(called bycrtbeginT.o
, not by crtbegin.o orcrtbeginS.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.