The gcov version is set to 11.1 (compatible with gcov 9) even if
`-Xclang -coverage-version=` specified version is less than 11.1.
Therefore, we can drop producer support for version < 11.1.
These tests rely on an unintended behavior that when the driver performs both
compilation and linking phases, the .gcno & .gcda files are placed in PWD. The
behavior will be fixed to respect -o (match -ftime-trace, -gsplit-dwarf, and
GCC).
Add -dumpdir ./ so that the tests will work with or without the behavior change,
and make it easy to compare the coverage behavior with GCC.
AIX 7.2 TL5 SP4 and AIX 7.3 TL0 SP2 have been released as of now.
The linker in these OS versions recognizes and properly supports
__start_SECNAME and __stop_SECNAME symbols which are needed for PGO.
This reverts commit 93bb2f16e85d2d4c8d3ddadebd99fc0fe26d974b.
GCC r187297 (2012-05) introduced `__gcov_dump` and `__gcov_reset`.
`__gcov_flush = __gcov_dump + __gcov_reset`
The resolution to https://gcc.gnu.org/PR93623 ("No need to dump gcdas when forking" target GCC 11.0) removed the unuseful and undocumented __gcov_flush.
Close PR38064.
Reviewed By: calixte, serge-sans-paille
Differential Revision: https://reviews.llvm.org/D83149
