libgccjit: allow common objects in $(EXTRA_GCC_OBJS) and $(EXTRA_OBJS)

This patch fixes libgccjit build failure on loongarch* targets,
and could probably be useful for future ports.

For now, libgccjit is linked with objects from $(EXTRA_GCC_OBJS) and
libbackend.a, which contains object files from $(EXTRA_OBJS).

This effectively forbids any overlap between those two lists, i.e. all
target-specific shared code between the gcc driver and compiler
executables must go into gcc/common/config/<arch>/<arch>-common.cc,
which feels a bit inconvenient when there are a lot of "common" stuff
that we want to put into separate source files.

By linking libgccjit with $(EXTRA_GCC_OBJS_EXCLUSIVE), which contains
all elements from $(EXTRA_GCC_OBJS) but not $(EXTRA_OBJS), this problem
can be alleviated.

This patch does not affect any other target architecture than loongarch,
and has been bootstrapped and regression-tested on loongarch64-linux-gnuf64
an x86_64-pc-linux-gnu.

* gcc/jit/ChangeLog:

	* Make-lang.in: only link objects from $(EXTRA_GCC_OBJS)
	that's not in $(EXTRA_OBJS) into libgccjit.

diff --git a/gcc/jit/Make-lang.in b/gcc/jit/Make-lang.in
index 6e10abf..248ec45 100644 (file)
--- a/gcc/jit/Make-lang.in
+++ b/gcc/jit/Make-lang.in
@@ -157,18 +157,23 @@ LIBGCCJIT_EXTRA_OPTS = $(LIBGCCJIT_VERSION_SCRIPT_OPTION) \
 endif
 endif
 
+# Only link objects from $(EXTRA_GCC_OBJS) that's not already
+# included in libbackend.a ($(EXTRA_OBJS)).
+EXTRA_GCC_OBJS_EXCLUSIVE = $(foreach _obj1, $(EXTRA_GCC_OBJS), \
+       $(if $(filter $(_obj1), $(EXTRA_OBJS)),, $(_obj1)))
+
 # We avoid using $(BACKEND) from Makefile.in in order to avoid pulling
 # in main.o
 $(LIBGCCJIT_FILENAME): $(jit_OBJS) \
        libbackend.a libcommon-target.a libcommon.a \
        $(CPPLIB) $(LIBDECNUMBER) \
        $(LIBDEPS) $(srcdir)/jit/libgccjit.map \
-       $(EXTRA_GCC_OBJS) $(jit.prev)
+       $(EXTRA_GCC_OBJS_EXCLUSIVE) $(jit.prev)
        @$(call LINK_PROGRESS,$(INDEX.jit),start)
        +$(LLINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ -shared \
             $(jit_OBJS) libbackend.a libcommon-target.a libcommon.a \
             $(CPPLIB) $(LIBDECNUMBER) $(EXTRA_GCC_LIBS) $(LIBS) $(BACKENDLIBS) \
-            $(EXTRA_GCC_OBJS) \
+            $(EXTRA_GCC_OBJS_EXCLUSIVE) \
             $(LIBGCCJIT_EXTRA_OPTS)
        @$(call LINK_PROGRESS,$(INDEX.jit),end)