https://llvm.org/bugs/show_bug.cgi?id=23969
Bug ID: 23969
Summary: "mcount" is deprecated for arm backend
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Current ARM bpapi (Base Platform Application Binary Interface) no longer uses
"mcount" as function profiler name, instead it uses "__gnu_mcount_nc".
(Refer to trunk gcc - gcc/config/arm/bpapi.h ARM_FUNCTION_PROFILER.)
Also checking the system libc.so, __gnu_mcount_nc is properly defined.
Notwithstanding the fact that "_mcount" and "mcount" are defined in libc.so,
they are not the default-version symbol, to link against these symbols, a
version script file has to be provided to the linker, otherwise we get an
undefined symbol error.
May I suggest override this value in ARMTaretInfo as -
this->MCountName = "__gnu_mcount_nc";
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