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

[Yang Yujie <yangyujie@loongson.cn>]

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Hello,

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

Currently libgccjit is linked with objects from $(EXTRA_GCC_OBJS) and
libbackend.a, which is in turn linked with $(EXTRA_OBJS) files.
Thus, common object files that's shared between those two $(EXTRA_*)
lists would cause the linker to abort for "redefined symbol"s.

For now, this patch doesn't affect any target other than LoongArch,
but might be useful for future ports that want to share more object
files between the compiler proper and the GCC driver than
${cpu_arch}-common.o.

Regression tested on loongarch64-linux-gnuf64 an x86_64-pc-linux-gnu, 
please review.

Yujie

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From 5d9121fa052c556fd854596af35da8e5649e8f08 Mon Sep 17 00:00:00 2001
From: Yang Yujie <yangyujie@loongson.cn>
Date: Fri, 22 Apr 2022 14:36:37 +0800
Subject: [PATCH] libgccjit: allow common objects in $(EXTRA_GCC_OBJS) and
 $(EXTRA_OBJS)

The final link of libgccjit involves libbackend.a and
$(EXTRA_GCC_OBJS) as input, where libbackend.a contains object files
from the $(EXTRA_OBJS) list.

This assumes that no target-specific object file should be shared
between those two lists (or the linker would complain about redefined
symbols and abort).

With this patch, libgccjit can built properly for LoongArch
and other architectures that shares target-specific objects between
gcc and cc1 etc.

* gcc/jit/ChangeLog:

	* Make-lang.in: only link objects from $(EXTRA_GCC_OBJS)
	that's not in $(EXTRA_OBJS) into libgccjit.
---
 gcc/jit/Make-lang.in | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/gcc/jit/Make-lang.in b/gcc/jit/Make-lang.in
index 6e10abfd0ac..248ec45b729 100644
--- 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)
 
-- 
2.31.1