New issue 2721: PGO build fails on macOS Sierra 10.12.4
https://bitbucket.org/pypy/pypy/issues/2721/pgo-build-fails-on-macos-sierra-10124
Ryan Hileman:
When running: `pypy ../../rpython/bin/rpython --opt=jit --profopt` I get
roughly `-lgcov not found`.
Looks like the rpython build tries to link libgcov which isn't part of llvm on
macOS. I believe the equivalent Apple LLVM flags to enable gcov are
`-fprofile-arcs -ftest-coverage`.
Replacing `-lgcov` with `-fprofile-arcs -ftest-coverage` seems to result in a
successful profopt build, though I'm not sure how to double-check:
```
if self.config.translation.shared:
- mk.rule('$(PROFOPT_TARGET)', '$(TARGET) main.o',
['$(CC_LINK) $(LDFLAGS_LINK) main.o -L.
-l$(SHARED_IMPORT_LIB) -o $@ $(RPATH_FLAGS) -lgcov', '$(MAKE) postcompile
BIN=$(PROFOPT_TARGET)'])
+ mk.rule('$(PROFOPT_TARGET)', '$(TARGET) main.o',
['$(CC_LINK) $(LDFLAGS_LINK) main.o -L.
-l$(SHARED_IMPORT_LIB) -o $@ $(RPATH_FLAGS) -fprofile-arcs -ftest-coverage',
'$(MAKE) postcompile BIN=$(PROFOPT_TARGET)'])
else:
mk.definition('PROFOPT_TARGET', '$(TARGET)')
```
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