Public bug reported:
In Ubuntu 20.04, libgcov.a for MinGW is almost empty:
```
nm -gC /usr/lib/gcc/x86_64-w64-mingw32/9.3-win32/libgcov.a | grep
__gcov_one_value_profiler
nm: _gcov_merge_ior.o: no symbols
nm: _gcov_merge_time_profile.o: no symbols
nm: _gcov_merge_icall_topn.o: no symbols
nm: _gcov_interval_profiler.o: no symbols
nm: _gcov_interval_profiler_atomic.o: no symbols
```
This breaks profile guided optimization. These symbols are present in
Ubuntu 18.04 (MinGW-gcc 7.3).
** Affects: gcc-mingw-w64 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1883933
Title:
gcc-mingw-w64 no symbols in libgcov.a
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