https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78481
Bug ID: 78481
Summary: libunwind.a conflicting recipes on AIX
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgcc
Assignee: unassigned at gcc dot gnu.org
Reporter: dje at gcc dot gnu.org
Target Milestone: ---
Target: powerpc-ibm-aix*
libgcc/Makefile.in defines:
libgcc.a libgcov.a libunwind.a libgcc_eh.a:
-rm -f $@
objects="$(objects)"; \
if test -z "$$objects"; then \
echo 'int __libgcc_eh_dummy;' > eh_dummy.c; \
$(gcc_compile_bare) $(vis_hide) -c eh_dummy.c \
-o eh_dummy$(objext); \
objects=eh_dummy$(objext); \
fi; \
$(AR_CREATE_FOR_TARGET) $@ $$objects
$(RANLIB) $@
and
libunwind$(SHLIB_EXT): $(libunwind-s-objects) $(extra-parts)
# @multilib_flags@ is still needed because this may use
# $(GCC_FOR_TARGET) and $(LIBGCC2_CFLAGS) directly.
# @multilib_dir@ is not really necessary, but sometimes it has
# more uses than just a directory name.
$(mkinstalldirs) $(MULTIDIR)
$(subst @multilib_flags@,$(CFLAGS) -B./,$(subst \
@multilib_dir@,$(MULTIDIR),$(subst \
@shlib_objs@,$(objects),$(subst \
@shlib_base_name@,libunwind,$(subst \
@shlib_slibdir_qual@,$(MULTIOSSUBDIR),$(SHLIBUNWIND_LINK))))))
endif
SHLIB_EXT is ".a" on AIX (a shared library is an archive of shared objects), so
the two recipes define the same target. This leads to the warning:
Makefile:985: warning: overriding recipe for target `libunwind.a'
Makefile:922: warning: ignoring old recipe for target `libunwind.a'
The Makefile generates the correct result by accident.
