With -pie and x86, the linker complains if it sees a PC-relative relocation

to access a global as it expects a GOTPCREL relocation.  This is really not
necessary as the linker could use a copy relocation to get around it.  This
patch enables copy relocations with pie.

Context:
This is useful because currently the GCC compiler with option -fpie makes
every extern global access go through the GOT. That is because the compiler
cannot tell if a global will end up being defined in the executable or not
and is conservative. This ends up hurting performance when the binary is linked
as mostly static where most of the globals do end up being defined in the
executable.  By allowing copy relocs with fPIE, the compiler need not generate
a GOTPCREL(GOT access) for any global access.  It can safely assume that all
globals will be defined in the executable and generate a PC-relative access
instead.  Gold can then create a copy reloc for only the undefined globals.

	gold/
	* symtab.h (may_need_copy_reloc): Remove check for position independent
	code.
	* x86_64.cc (Target_x86_64<size>::Scan::global): Add check for no
	position independence before pc absolute may_need_copy_reloc call.
	Add check for executable output befor pc relative may_need_copy_reloc
	call.
	* i386.cc: Ditto.
	* arm.cc: Ditto.
	* sparc.cc: Ditto.
	* tilegx.cc: Ditto.
	* powerpc.cc: Add check for no position independence before
	may_need_copy_reloc calls.
	* testsuite/pie_copyrelocs_test.cc: New file.
	* testsuite/pie_copyrelocs_shared_test.cc: New file.
	* Makefile.am (pie_copyrelocs_test): New test.
	* Makefile.in: Regenerate.

2 files changed, 42 insertions, 10 deletions

diff --git a/gold/testsuite/Makefile.am b/gold/testsuite/Makefile.am
index 1f275b0..0373464 100644
--- a/gold/testsuite/Makefile.am
+++ b/gold/testsuite/Makefile.am
@@ -517,6 +517,16 @@ two_file_pie_test: two_file_test_1_pie.o two_file_test_1b_pie.o \
 		two_file_test_2_pie.o two_file_test_main_pie.o gcctestdir/ld
 	$(CXXLINK) -Bgcctestdir/ -pie two_file_test_1_pie.o two_file_test_1b_pie.o two_file_test_2_pie.o two_file_test_main_pie.o
 
+check_PROGRAMS += pie_copyrelocs_test
+pie_copyrelocs_test_SOURCES = pie_copyrelocs_test.cc
+pie_copyrelocs_test_DEPENDENCIES = gcctestdir/ld pie_copyrelocs_shared_test.so
+pie_copyrelocs_test_LDFLAGS = -Bgcctestdir/ -Wl,-R,. -pie
+pie_copyrelocs_test_LDADD = pie_copyrelocs_shared_test.so
+pie_copyrelocs_shared_test.o: pie_copyrelocs_shared_test.cc
+	$(CXXCOMPILE) -O2 -fpic -c -o $@ $<
+pie_copyrelocs_shared_test.so: pie_copyrelocs_shared_test.o gcctestdir/ld
+	$(CXXLINK) -Bgcctestdir/ -shared pie_copyrelocs_shared_test.o
+
 check_SCRIPTS += two_file_shared.sh
 check_DATA += two_file_shared.dbg
 MOSTLYCLEANFILES += two_file_shared.dbg
diff --git a/gold/testsuite/Makefile.in b/gold/testsuite/Makefile.in
index 028c262..11403ac 100644
--- a/gold/testsuite/Makefile.in
+++ b/gold/testsuite/Makefile.in
@@ -181,7 +181,8 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_separate_shared_12_test \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_separate_shared_21_test \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_relocatable_test \
-@GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_pie_test
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_pie_test \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	pie_copyrelocs_test
 
 # The nonpic tests will fail on platforms which can not put non-PIC
 # code into shared libraries, so we just don't run them in that case.
@@ -782,7 +783,8 @@ libgoldtest_a_OBJECTS = $(am_libgoldtest_a_OBJECTS)
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_separate_shared_12_test$(EXEEXT) \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_separate_shared_21_test$(EXEEXT) \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_relocatable_test$(EXEEXT) \
-@GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_pie_test$(EXEEXT)
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_pie_test$(EXEEXT) \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	pie_copyrelocs_test$(EXEEXT)
 @FN_PTRS_IN_SO_WITHOUT_PIC_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@am__EXEEXT_9 = two_file_shared_1_nonpic_test$(EXEEXT) \
 @FN_PTRS_IN_SO_WITHOUT_PIC_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_shared_2_nonpic_test$(EXEEXT) \
 @FN_PTRS_IN_SO_WITHOUT_PIC_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_same_shared_nonpic_test$(EXEEXT) \
@@ -1407,6 +1409,11 @@ permission_test_LDADD = $(LDADD)
 permission_test_DEPENDENCIES = libgoldtest.a ../libgold.a \
 	../../libiberty/libiberty.a $(am__DEPENDENCIES_1) \
 	$(am__DEPENDENCIES_1) $(am__DEPENDENCIES_1)
+@GCC_TRUE@@NATIVE_LINKER_TRUE@am_pie_copyrelocs_test_OBJECTS =  \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	pie_copyrelocs_test.$(OBJEXT)
+pie_copyrelocs_test_OBJECTS = $(am_pie_copyrelocs_test_OBJECTS)
+pie_copyrelocs_test_LINK = $(CXXLD) $(AM_CXXFLAGS) $(CXXFLAGS) \
+	$(pie_copyrelocs_test_LDFLAGS) $(LDFLAGS) -o $@
 plugin_test_1_SOURCES = plugin_test_1.c
 plugin_test_1_OBJECTS = plugin_test_1.$(OBJEXT)
 plugin_test_1_LDADD = $(LDADD)
@@ -1875,14 +1882,15 @@ SOURCES = $(libgoldtest_a_SOURCES) basic_pic_test.c basic_pie_test.c \
 	$(large_symbol_alignment_SOURCES) $(leb128_unittest_SOURCES) \
 	local_labels_test.c many_sections_r_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 \
-	plugin_test_6.c plugin_test_7.c plugin_test_8.c \
-	plugin_test_tls.c $(protected_1_SOURCES) \
-	$(protected_2_SOURCES) $(relro_now_test_SOURCES) \
-	$(relro_script_test_SOURCES) $(relro_strip_test_SOURCES) \
-	$(relro_test_SOURCES) $(script_test_1_SOURCES) \
-	script_test_11.c $(script_test_2_SOURCES) script_test_3.c \
+	permission_test.c $(pie_copyrelocs_test_SOURCES) \
+	plugin_test_1.c plugin_test_2.c plugin_test_3.c \
+	plugin_test_4.c plugin_test_5.c plugin_test_6.c \
+	plugin_test_7.c plugin_test_8.c plugin_test_tls.c \
+	$(protected_1_SOURCES) $(protected_2_SOURCES) \
+	$(relro_now_test_SOURCES) $(relro_script_test_SOURCES) \
+	$(relro_strip_test_SOURCES) $(relro_test_SOURCES) \
+	$(script_test_1_SOURCES) script_test_11.c \
+	$(script_test_2_SOURCES) script_test_3.c \
 	$(searched_file_test_SOURCES) start_lib_test.c \
 	$(thin_archive_test_1_SOURCES) $(thin_archive_test_2_SOURCES) \
 	$(tls_phdrs_script_test_SOURCES) $(tls_pic_test_SOURCES) \
@@ -2312,6 +2320,10 @@ LDADD = libgoldtest.a ../libgold.a ../../libiberty/libiberty.a $(LIBINTL) \
 
 @GCC_TRUE@@NATIVE_LINKER_TRUE@two_file_relocatable_test_LDFLAGS = -Bgcctestdir/ -Wl,-R,.
 @GCC_TRUE@@NATIVE_LINKER_TRUE@two_file_relocatable_test_LDADD = two_file_relocatable.o
+@GCC_TRUE@@NATIVE_LINKER_TRUE@pie_copyrelocs_test_SOURCES = pie_copyrelocs_test.cc
+@GCC_TRUE@@NATIVE_LINKER_TRUE@pie_copyrelocs_test_DEPENDENCIES = gcctestdir/ld pie_copyrelocs_shared_test.so
+@GCC_TRUE@@NATIVE_LINKER_TRUE@pie_copyrelocs_test_LDFLAGS = -Bgcctestdir/ -Wl,-R,. -pie
+@GCC_TRUE@@NATIVE_LINKER_TRUE@pie_copyrelocs_test_LDADD = pie_copyrelocs_shared_test.so
 @FN_PTRS_IN_SO_WITHOUT_PIC_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@two_file_shared_1_nonpic_test_SOURCES = \
 @FN_PTRS_IN_SO_WITHOUT_PIC_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_test_2.cc two_file_test_main.cc
 
@@ -3245,6 +3257,9 @@ object_unittest$(EXEEXT): $(object_unittest_OBJECTS) $(object_unittest_DEPENDENC
 @NATIVE_LINKER_FALSE@permission_test$(EXEEXT): $(permission_test_OBJECTS) $(permission_test_DEPENDENCIES) 
 @NATIVE_LINKER_FALSE@	@rm -f permission_test$(EXEEXT)
 @NATIVE_LINKER_FALSE@	$(LINK) $(permission_test_OBJECTS) $(permission_test_LDADD) $(LIBS)
+pie_copyrelocs_test$(EXEEXT): $(pie_copyrelocs_test_OBJECTS) $(pie_copyrelocs_test_DEPENDENCIES) 
+	@rm -f pie_copyrelocs_test$(EXEEXT)
+	$(pie_copyrelocs_test_LINK) $(pie_copyrelocs_test_OBJECTS) $(pie_copyrelocs_test_LDADD) $(LIBS)
 @GCC_FALSE@plugin_test_1$(EXEEXT): $(plugin_test_1_OBJECTS) $(plugin_test_1_DEPENDENCIES) 
 @GCC_FALSE@	@rm -f plugin_test_1$(EXEEXT)
 @GCC_FALSE@	$(LINK) $(plugin_test_1_OBJECTS) $(plugin_test_1_LDADD) $(LIBS)
@@ -3635,6 +3650,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/many_sections_test.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/object_unittest.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/permission_test.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pie_copyrelocs_test.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/plugin_test_1.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/plugin_test_2.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/plugin_test_3.Po@am__quote@
@@ -4202,6 +4218,8 @@ two_file_relocatable_test.log: two_file_relocatable_test$(EXEEXT)
 	@p='two_file_relocatable_test$(EXEEXT)'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
 two_file_pie_test.log: two_file_pie_test$(EXEEXT)
 	@p='two_file_pie_test$(EXEEXT)'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
+pie_copyrelocs_test.log: pie_copyrelocs_test$(EXEEXT)
+	@p='pie_copyrelocs_test$(EXEEXT)'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
 two_file_shared_1_nonpic_test.log: two_file_shared_1_nonpic_test$(EXEEXT)
 	@p='two_file_shared_1_nonpic_test$(EXEEXT)'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
 two_file_shared_2_nonpic_test.log: two_file_shared_2_nonpic_test$(EXEEXT)
@@ -4805,6 +4823,10 @@ uninstall-am:
 @GCC_TRUE@@NATIVE_LINKER_TRUE@two_file_pie_test: two_file_test_1_pie.o two_file_test_1b_pie.o \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@		two_file_test_2_pie.o two_file_test_main_pie.o gcctestdir/ld
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	$(CXXLINK) -Bgcctestdir/ -pie two_file_test_1_pie.o two_file_test_1b_pie.o two_file_test_2_pie.o two_file_test_main_pie.o
+@GCC_TRUE@@NATIVE_LINKER_TRUE@pie_copyrelocs_shared_test.o: pie_copyrelocs_shared_test.cc
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(CXXCOMPILE) -O2 -fpic -c -o $@ $<
+@GCC_TRUE@@NATIVE_LINKER_TRUE@pie_copyrelocs_shared_test.so: pie_copyrelocs_shared_test.o gcctestdir/ld
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(CXXLINK) -Bgcctestdir/ -shared pie_copyrelocs_shared_test.o
 @GCC_TRUE@@NATIVE_LINKER_TRUE@two_file_shared.dbg: two_file_shared.so
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	$(TEST_READELF) -w $< >$@ 2>/dev/null
 @FN_PTRS_IN_SO_WITHOUT_PIC_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@two_file_shared_1_nonpic.so: two_file_test_1.o gcctestdir/ld