gcc/libgcc/config/t-slibgcc-darwin

# Build a shared libgcc library with the darwin linker.
SHLIB_SOVERSION = 1
SHLIB_VERSTRING = -compatibility_version $(SHLIB_SOVERSION) -current_version $(SHLIB_SOVERSION).0
SHLIB_EXT = .dylib
SHLIB_INSTALL_NAME = @shlib_base_name@.$(SHLIB_SOVERSION)$(SHLIB_EXT)
SHLIB_SONAME = @shlib_base_name@$(SHLIB_EXT)
SHLIB_SOLINK = @shlib_base_name@.so
SHLIB_MAP = @shlib_map_file@
SHLIB_OBJS = @shlib_objs@
SHLIB_DIR = @multilib_dir@
SHLIB_LC = -lc

# 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 the versioned members of $(INSTALL_FILES).

SHLIB_LINK = $(CC) $(LIBGCC2_CFLAGS) -dynamiclib -nodefaultlibs \
	-install_name @shlib_slibdir@/$(SHLIB_INSTALL_NAME) \
	-single_module -o $(SHLIB_DIR)/$(SHLIB_SONAME) \
	-Wl,-exported_symbols_list,$(SHLIB_MAP) \
	$(SHLIB_VERSTRING) \
	@multilib_flags@ $(SHLIB_OBJS) $(SHLIB_LC)

SHLIB_MKMAP = $(srcdir)/mkmap-flat.awk
SHLIB_MKMAP_OPTS = -v leading_underscore=1
SHLIB_MAPFILES = libgcc-std.ver $(srcdir)/config/libgcc-libsystem.ver
SHLIB_VERPFX = $(srcdir)/config/$(cpu_type)/libgcc-darwin

# we're only going to build the stubs if the target slib is /usr/lib
# there is no other case in which they're useful in a live system.
ifeq (/usr/lib,$(shlib_slibdir))
LGCC_STUBS = libgcc_s.10.4.dylib libgcc_s.10.5.dylib
else
LGCC_STUBS =
endif

LGCC_FILES = libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)
LGCC_FILES += $(LGCC_STUBS)
LEXT_STUBS = libgcc_ext.10.4$(SHLIB_EXT) libgcc_ext.10.5$(SHLIB_EXT)
LGCC_FILES += $(LEXT_STUBS)
INSTALL_FILES=$(LGCC_FILES)

# we do our own thing
SHLIB_INSTALL =

# For the toplevel multilib, build a fat archive including all the multilibs.
ifeq ($(MULTIBUILDTOP),)

ifeq ($(enable_shared),yes)
all: $(INSTALL_FILES)
install-leaf: install-darwin-libgcc-stubs
endif

# 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 : all-multi $(SHLIB_VERPFX).%.ver libgcc_s$(SHLIB_EXT)
	MLIBS=`$(CC) --print-multi-lib | sed -e 's/;.*$$//'` ; \
	for mlib in $$MLIBS ; do \
	  $(STRIP) -o $(@)_T$${mlib} \
	    -s $(SHLIB_VERPFX).$(*).ver -c -u \
	    ../$${mlib}/libgcc/$${mlib}/libgcc_s$(SHLIB_EXT)  || exit 1 ; \
	done
	$(LIPO) -output $@ -create $(@)_T*
	rm $(@)_T*

libgcc_ext.%.dylib : all-multi $(SHLIB_VERPFX).%.ver libgcc_s$(SHLIB_EXT) 
	MLIBS=`$(CC) --print-multi-lib | sed -e 's/;.*$$//'` ; \
	for mlib in $$MLIBS ; do \
	  $(STRIP) -o $(@)_T$${mlib} \
	    -R $(SHLIB_VERPFX).$(*).ver -c -urx \
	    ../$${mlib}/libgcc/$${mlib}/libgcc_s$(SHLIB_EXT) || exit 1 ; \
	done
	$(LIPO) -output $@ -create $(@)_T*
	rm $(@)_T*

libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT): all-multi libgcc_s$(SHLIB_EXT)
	MLIBS=`$(CC) --print-multi-lib | sed -e 's/;.*$$//'` ; \
	for mlib in $$MLIBS ; do \
	  cp ../$${mlib}/libgcc/$${mlib}/libgcc_s$(SHLIB_EXT)  \
	    ./libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} || exit 1 ; \
	done
	$(LIPO) -output libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT) \
	  -create libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
	rm libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*

install-darwin-libgcc-stubs :
	$(mkinstalldirs) $(DESTDIR)$(slibdir)
	for d in $(INSTALL_FILES) ; do \
	  $(INSTALL_DATA) $$d $(DESTDIR)$(slibdir)/$$d || exit 1 ; \
	done
	if [ -f $(DESTDIR)$(slibdir)/libgcc_s_ppc64.1.dylib ]; then \
	  rm -f $(DESTDIR)$(slibdir)/libgcc_s_ppc64.1.dylib; \
	else true; fi
	$(LN_S) libgcc_s.1.dylib \
		$(DESTDIR)$(slibdir)/libgcc_s_ppc64.1.dylib
	if [ -f $(DESTDIR)$(slibdir)/libgcc_s_x86_64.1.dylib ]; then \
	  rm -f $(DESTDIR)$(slibdir)/libgcc_s_x86_64.1.dylib; \
	else true; fi
	$(LN_S) libgcc_s.1.dylib \
		$(DESTDIR)$(slibdir)/libgcc_s_x86_64.1.dylib

else

# Do not install shared libraries for any other multilibs.  Unless
# we're putting them in the gcc directory during a build, for
# compatibility with the pre-top-level layout.  In that case we
# need symlinks.

ifeq ($(enable_shared),yes)
all: install-darwin-libgcc-links
endif

install-darwin-libgcc-links:
	$(mkinstalldirs) $(gcc_objdir)$(MULTISUBDIR)
	for file in $(INSTALL_FILES); do			\
	  rm -f $(gcc_objdir)$(MULTISUBDIR)/$$file;		\
	  $(LN_S) ../$$file $(gcc_objdir)$(MULTISUBDIR)/;	\
	done

	rm -f $(gcc_objdir)$(MULTISUBDIR)/libgcc_s_x86_64.1.dylib
	$(LN_S) libgcc_s.1.dylib \
		$(gcc_objdir)$(MULTISUBDIR)/libgcc_s_x86_64.1.dylib

	rm -f $(gcc_objdir)$(MULTISUBDIR)/libgcc_s_ppc64.1.dylib
	$(LN_S) libgcc_s.1.dylib \
		$(gcc_objdir)$(MULTISUBDIR)/libgcc_s_ppc64.1.dylib

endif