# Build a shared libgcc library with the darwin linker.
SHLIB_SOVERSION = 1
SHLIB_VERSTRING = -compatibility_version $(SHLIB_SOVERSION) -current_version $(SHLIB_SOVERSION).0
SHLIB_EXT = .dylib
SHLIB_SUFFIX = `if test @multilib_dir@ != . ; then echo _@multilib_dir@ ; fi`
SHLIB_SONAME = @shlib_base_name@$(SHLIB_SUFFIX).$(SHLIB_SOVERSION)$(SHLIB_EXT)
SHLIB_MAP = @shlib_map_file@
SHLIB_OBJS = @shlib_objs@
SHLIB_DIR = @multilib_dir@

# Darwin only searches in /usr/lib for shared libraries, not in subdirectories,
# so the libgcc variants have different names not different locations.
# Note that this version is used for the loader, not the linker; the linker
# uses the stub versions named by $(LIBGCC).
SHLIB_LINK = $(GCC_FOR_TARGET) $(LIBGCC2_CFLAGS) -dynamiclib -nodefaultlibs \
	-Wl,-install_name,$(slibdir)/$(SHLIB_SONAME) \
	-single_module -o $(SHLIB_SONAME).tmp \
	-Wl,-exported_symbols_list,$(SHLIB_MAP) \
	$(SHLIB_VERSTRING) \
	@multilib_flags@ $(SHLIB_OBJS) -lc && \
	if [ -f $(SHLIB_SONAME) ]; then \
	  mv -f $(SHLIB_SONAME) $(SHLIB_SONAME).backup; \
	else true; fi && \
	mv $(SHLIB_SONAME).tmp $(SHLIB_SONAME)

# $(slibdir) double quoted to protect it from expansion while building
# libgcc.mk.  We want this delayed until actual install time.
SHLIB_INSTALL = \
	$$(mkinstalldirs) $$(DESTDIR)$$(slibdir); \
	$(INSTALL_DATA) $(SHLIB_SONAME) \
	  $$(DESTDIR)$$(slibdir)/$(SHLIB_SONAME)

SHLIB_MKMAP = $(srcdir)/mkmap-flat.awk
SHLIB_MKMAP_OPTS = -v leading_underscore=1
SHLIB_MAPFILES += $(srcdir)/libgcc-std.ver

# Must use a different directive for hidden visibility in assembly sources.
ASM_HIDDEN_OP = .private_extern

# In order to support -mmacosx-version-min, you need to have multiple
# different libgcc_s libraries that actually get linked against, one for
# each system version supported.  They are 'stub' libraries that
# contain no code, just a list of exported symbols.
# The actual use of the libraries is controlled by REAL_LIBGCC_SPEC.
# 
# This assumes each multilib corresponds to a different architecture.
libgcc_s.%.dylib : $(SHLIB_VERPFX).%.ver libgcc.a
	# When builting multilibbed target libraries, all the required
	# libraries are expected to exist in the multilib directory.
	MLIBS=`$(GCC_FOR_TARGET) --print-multi-lib \
		| sed -e 's/;.*$$//' -e '/^\.$$/d'` ; \
	for mlib in $$MLIBS ; do \
	  rm -f $${mlib}/$@ || exit 1 ; \
	  $(LN_S) ../$@ $${mlib}/$@ || exit 1 ; \
	done
	MLIBS=`$(GCC_FOR_TARGET) --print-multi-lib \
		| sed -e 's/;.*$$//' -e '/^\.$$/d' -e 's/^/_/'` ; \
	for mlib in '' $$MLIBS ; do \
	  $(STRIP_FOR_TARGET) -o $(@)_T$${mlib} \
	    -s $(SHLIB_VERPFX).$(*).ver -c -u \
	    libgcc_s$${mlib}.$(SHLIB_SOVERSION)$(SHLIB_EXT) || exit 1 ; \
	done
	$(LIPO_FOR_TARGET) -output $@ -create $(@)_T*
	rm $(@)_T*

# From the point-of-view of the Makefiles, libgcc is built by the 'strip'
# and 'lipo' commands above.
LIBGCC=libgcc_s.10.4.dylib libgcc_s.10.5.dylib

install-darwin-libgcc-stubs : $(LIBGCC) installdirs
	for d in $(LIBGCC) ; do \
	  $(INSTALL_DATA) $$d $(DESTDIR)$(slibdir)/$$d || exit 1 ; \
	done

INSTALL_LIBGCC += install-darwin-libgcc-stubs