gcc PR lto/42757

	* plugin.cc (Pluginobj::get_symbol_resolution_info): Check for
	prevailing definitions of common symbols.
	* testsuite/plugin_test_6.sh: New test case.
	* testsuite/plugin_common_test_1.c: New test case.
	* testsuite/plugin_common_test_2.c: New test case.
	* testsuite/Makefile.am (plugin_test_6): New test case.
	* testsuite/Makefile.in: Regenerate.

1 files changed, 36 insertions, 6 deletions

diff --git a/gold/testsuite/Makefile.in b/gold/testsuite/Makefile.in
index 86d7a5d..32a0db3 100644
--- a/gold/testsuite/Makefile.in
+++ b/gold/testsuite/Makefile.in
@@ -242,23 +242,27 @@ check_PROGRAMS = object_unittest$(EXEEXT) binary_unittest$(EXEEXT) \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_2 \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_3 \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_4 \
-@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_5
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_5 \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_6
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@am__append_23 =  \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_1.sh \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_2.sh \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_3.sh \
-@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_4.sh
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_4.sh \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_6.sh
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@am__append_24 =  \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_1.err \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_2.err \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_3.err \
-@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_4.err
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_4.err \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_6.err
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@am__append_25 =  \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_1.err \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_2.err \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_3.err \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_4.a \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_4.err \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_6.err \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	unused.c
 @GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_26 = exclude_libs_test \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	local_labels_test \
@@ -470,7 +474,8 @@ libgoldtest_a_OBJECTS = $(am_libgoldtest_a_OBJECTS)
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_2$(EXEEXT) \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_3$(EXEEXT) \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_4$(EXEEXT) \
-@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_5$(EXEEXT)
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_5$(EXEEXT) \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	plugin_test_6$(EXEEXT)
 @GCC_TRUE@@NATIVE_LINKER_TRUE@am__EXEEXT_17 =  \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	exclude_libs_test$(EXEEXT) \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	local_labels_test$(EXEEXT) \
@@ -733,6 +738,12 @@ plugin_test_5_LDADD = $(LDADD)
 plugin_test_5_DEPENDENCIES = libgoldtest.a ../libgold.a \
 	../../libiberty/libiberty.a $(am__DEPENDENCIES_1) \
 	$(am__DEPENDENCIES_1) $(am__DEPENDENCIES_1)
+plugin_test_6_SOURCES = plugin_test_6.c
+plugin_test_6_OBJECTS = plugin_test_6.$(OBJEXT)
+plugin_test_6_LDADD = $(LDADD)
+plugin_test_6_DEPENDENCIES = libgoldtest.a ../libgold.a \
+	../../libiberty/libiberty.a $(am__DEPENDENCIES_1) \
+	$(am__DEPENDENCIES_1) $(am__DEPENDENCIES_1)
 am__protected_1_SOURCES_DIST = protected_main_1.cc protected_main_2.cc \
 	protected_main_3.cc
 @GCC_TRUE@@NATIVE_LINKER_TRUE@am_protected_1_OBJECTS =  \
@@ -1165,7 +1176,7 @@ SOURCES = $(libgoldtest_a_SOURCES) basic_pic_test.c basic_pie_test.c \
 	$(many_sections_test_SOURCES) $(object_unittest_SOURCES) \
 	permission_test.c plugin_test_1.c plugin_test_2.c \
 	plugin_test_3.c plugin_test_4.c plugin_test_5.c \
-	$(protected_1_SOURCES) $(protected_2_SOURCES) \
+	plugin_test_6.c $(protected_1_SOURCES) $(protected_2_SOURCES) \
 	$(relro_script_test_SOURCES) $(relro_test_SOURCES) \
 	$(script_test_1_SOURCES) $(script_test_2_SOURCES) \
 	script_test_3.c $(searched_file_test_SOURCES) \
@@ -1225,7 +1236,8 @@ DIST_SOURCES = $(libgoldtest_a_SOURCES) basic_pic_test.c \
 	many_sections_r_test.c $(am__many_sections_test_SOURCES_DIST) \
 	$(object_unittest_SOURCES) permission_test.c plugin_test_1.c \
 	plugin_test_2.c plugin_test_3.c plugin_test_4.c \
-	plugin_test_5.c $(am__protected_1_SOURCES_DIST) \
+	plugin_test_5.c plugin_test_6.c \
+	$(am__protected_1_SOURCES_DIST) \
 	$(am__protected_2_SOURCES_DIST) \
 	$(am__relro_script_test_SOURCES_DIST) \
 	$(am__relro_test_SOURCES_DIST) \
@@ -2049,6 +2061,15 @@ object_unittest$(EXEEXT): $(object_unittest_OBJECTS) $(object_unittest_DEPENDENC
 @PLUGINS_FALSE@plugin_test_5$(EXEEXT): $(plugin_test_5_OBJECTS) $(plugin_test_5_DEPENDENCIES) 
 @PLUGINS_FALSE@	@rm -f plugin_test_5$(EXEEXT)
 @PLUGINS_FALSE@	$(LINK) $(plugin_test_5_OBJECTS) $(plugin_test_5_LDADD) $(LIBS)
+@GCC_FALSE@plugin_test_6$(EXEEXT): $(plugin_test_6_OBJECTS) $(plugin_test_6_DEPENDENCIES) 
+@GCC_FALSE@	@rm -f plugin_test_6$(EXEEXT)
+@GCC_FALSE@	$(LINK) $(plugin_test_6_OBJECTS) $(plugin_test_6_LDADD) $(LIBS)
+@NATIVE_LINKER_FALSE@plugin_test_6$(EXEEXT): $(plugin_test_6_OBJECTS) $(plugin_test_6_DEPENDENCIES) 
+@NATIVE_LINKER_FALSE@	@rm -f plugin_test_6$(EXEEXT)
+@NATIVE_LINKER_FALSE@	$(LINK) $(plugin_test_6_OBJECTS) $(plugin_test_6_LDADD) $(LIBS)
+@PLUGINS_FALSE@plugin_test_6$(EXEEXT): $(plugin_test_6_OBJECTS) $(plugin_test_6_DEPENDENCIES) 
+@PLUGINS_FALSE@	@rm -f plugin_test_6$(EXEEXT)
+@PLUGINS_FALSE@	$(LINK) $(plugin_test_6_OBJECTS) $(plugin_test_6_LDADD) $(LIBS)
 protected_1$(EXEEXT): $(protected_1_OBJECTS) $(protected_1_DEPENDENCIES) 
 	@rm -f protected_1$(EXEEXT)
 	$(protected_1_LINK) $(protected_1_OBJECTS) $(protected_1_LDADD) $(LIBS)
@@ -2279,6 +2300,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/plugin_test_3.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/plugin_test_4.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/plugin_test_5.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/plugin_test_6.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/protected_3.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/protected_main_1.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/protected_main_2.Po@am__quote@
@@ -3148,6 +3170,10 @@ uninstall-am:
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	$(TEST_AR) cr $@ $^
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_test_5: two_file_test_main.o two_file_test_1.syms two_file_test_1b.syms two_file_test_2.syms unused.syms gcctestdir/ld plugin_test.so
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	$(CXXLINK) -Bgcctestdir/ -Wl,--no-demangle,--plugin,"./plugin_test.so",--plugin-opt,"_Z4f13iv",--gc-sections two_file_test_main.o two_file_test_1.syms two_file_test_1b.syms two_file_test_2.syms unused.syms
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_test_6: plugin_common_test_1.syms plugin_common_test_2.syms gcctestdir/ld plugin_test.so
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	$(CXXLINK) -Bgcctestdir/ -Wl,--no-demangle,--plugin,"./plugin_test.so" plugin_common_test_1.syms plugin_common_test_2.syms 2>plugin_test_6.err
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_test_6.err: plugin_test_6
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	@touch plugin_test_6.err
 
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_test.so: plugin_test.o
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	$(LINK) -Bgcctestdir/ -shared plugin_test.o
@@ -3162,6 +3188,10 @@ uninstall-am:
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	$(TEST_READELF) -sW $< >$@ 2>/dev/null
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@two_file_test_2.syms: two_file_test_2.o
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	$(TEST_READELF) -sW $< >$@ 2>/dev/null
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_common_test_1.syms: plugin_common_test_1.o
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	$(TEST_READELF) -sW $< >$@ 2>/dev/null
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_common_test_2.syms: plugin_common_test_2.o
+@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	$(TEST_READELF) -sW $< >$@ 2>/dev/null
 
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@empty.syms:
 @GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@	@echo "" >$@