https://llvm.org/bugs/show_bug.cgi?id=25286
Bug ID: 25286
Summary: Profile Instrumentation and linker (gnu) garbage
collection
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: davi...@google.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
If you use the latest clang to build an instrumented executable or shared
library with garbage collection turned on, you will get a linker error if the
linker is gnu ld:
clang -fprofile-instr-generate -fdata-sections -ffunction-sections
-Wl,--gc-sections t.c
The affected platform is Linux and FreeBSD. This is basically a gnu linker bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=19161
It is possible to workaround this by changing clang driver, but the solution is
hacky and temporary, so not desirable.
If you hit the problem, here are three solutions:
1) update the gnu linker (when the fix is released)
2) use gold linker: -fuse-ld=gold
3) use the following linker script -- name it prf_data.x
SECTIONS {
__llvm_prf_data : { KEEP(*(__llvm_prf_data)) }
}
and add the following link option: -Wl,-T,prf_data.x
Keep this bug open as a place holder to document the issue.
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