Use ELF symbol versioning

At the same time, we must bump the (major) ABI version.  This needed to be
done anyway due to ABI breakage in the AArch64 port (see 12cf89ee and the
corresponding GCC PR70024).

Makefile.am

@@ -155,7 +155,6 @@ EXTRA_libffi_la_SOURCES = \
 
 TARGET_OBJ = @TARGET_OBJ@
 libffi_la_LIBADD = $(TARGET_OBJ)
-libffi_la_DEPENDENCIES = $(TARGET_OBJ)
 
 libffi_convenience_la_SOURCES = $(libffi_la_SOURCES)
 EXTRA_libffi_convenience_la_SOURCES = $(EXTRA_libffi_la_SOURCES)
@@ -172,7 +171,32 @@ if FFI_DEBUG
 AM_CFLAGS += -DFFI_DEBUG
 endif
 
-libffi_la_LDFLAGS = -no-undefined -version-info `grep -v '^\#' $(srcdir)/libtool-version` $(LTLDFLAGS) $(AM_LTLDFLAGS)
+if LIBFFI_BUILD_VERSIONED_SHLIB
+if LIBFFI_BUILD_VERSIONED_SHLIB_GNU
+libffi_version_script = -Wl,--version-script,libffi.map
+libffi_version_dep = libffi.map
+endif
+if LIBFFI_BUILD_VERSIONED_SHLIB_SUN
+libffi_version_script = -Wl,-M,libffi.map-sun
+libffi_version_dep = libffi.map-sun
+libffi.map-sun : libffi.map $(top_srcdir)/../contrib/make_sunver.pl \
+		 $(libffi_la_OBJECTS) $(libffi_la_LIBADD)
+	perl $(top_srcdir)/../contrib/make_sunver.pl libffi.map \
+	 `echo $(libffi_la_OBJECTS) $(libffi_la_LIBADD) | \
+	    sed 's,\([^/        ]*\)\.l\([ao]\),.libs/\1.\2,g'` \
+	 > $@ || (rm -f $@ ; exit 1)
+endif
+else
+libffi_version_script =
+libffi_version_dep =
+endif
+libffi_version_info = -version-info `grep -v '^\#' $(srcdir)/libtool-version`
+
+libffi.map: $(top_srcdir)/libffi.map.in
+	$(COMPILE) -D$(TARGET) -E -x assembler-with-cpp -o $@ $<
+
+libffi_la_LDFLAGS = -no-undefined $(libffi_version_info) $(libffi_version_script) $(LTLDFLAGS) $(AM_LTLDFLAGS)
+libffi_la_DEPENDENCIES = $(libffi_la_LIBADD) $(libffi_version_dep)
 
 AM_CPPFLAGS = -I. -I$(top_srcdir)/include -Iinclude -I$(top_srcdir)/src
 AM_CCASFLAGS = $(AM_CPPFLAGS)