Properly handle common symbol and weak function

bfd/

	PR ld/14591
	* elf-bfd.h (_bfd_elf_merge_symbol): Add an argument to return
	if the old symbol is weak.

	* elf32-sh-symbian.c (sh_symbian_relocate_section): Update
	_bfd_elf_merge_symbol call.

	* elflink.c (_bfd_elf_merge_symbol): Add an argument to return
	if the old symbol is weak.
	(_bfd_elf_add_default_symbol): Update _bfd_elf_merge_symbol
	call.
	(elf_link_add_object_symbols): Don't update symbol type from a
	weak definition.  Update symbol type from a common symbol when
	overriding a weak symbol.

ld/testsuite/

	PR ld/14591
	* ld-elf/comm-data.exp (run_ld_link_tests): Add comm-data3a and
	comm-data3b tests.

	* ld-ifunc/ifunc.exp (run_ld_link_exec_tests): New.

	* ld-elf/comm-data3.sd: New file.
	* ld-elf/comm-data3a.s: Likewise.
	* ld-elf/comm-data3b.s: Likewise.
	* ld-ifunc/ifunc-17a-i386.d: Likewise.
	* ld-ifunc/ifunc-17a-x86-64.d: Likewise.
	* ld-ifunc/ifunc-17a.s: Likewise.
	* ld-ifunc/ifunc-17b-i386.d: Likewise.
	* ld-ifunc/ifunc-17b-x86-64.d: Likewise.
	* ld-ifunc/ifunc-17b.s: Likewise.
	* ld-ifunc/ifunc-common-1.out: Likewise.
	* ld-ifunc/ifunc-common-1a.c: Likewise.
	* ld-ifunc/ifunc-common-1b.c: Likewise.

10 files changed, 100 insertions, 0 deletions

diff --git a/ld/testsuite/ld-ifunc/ifunc-17a-i386.d b/ld/testsuite/ld-ifunc/ifunc-17a-i386.d
new file mode 100644
index 0000000..303b54e
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-17a-i386.d
@@ -0,0 +1,10 @@
+#source: ifunc-17a.s
+#source: ifunc-17b.s
+#ld: -static -m elf_i386
+#as: --32
+#readelf: -s --wide
+#target: x86_64-*-* i?86-*-*
+
+#...
+ +[0-9]+: +[0-9a-f]+ +4 +OBJECT +GLOBAL +DEFAULT +[1-9] foo
+#pass
diff --git a/ld/testsuite/ld-ifunc/ifunc-17a-x86-64.d b/ld/testsuite/ld-ifunc/ifunc-17a-x86-64.d
new file mode 100644
index 0000000..965ef63
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-17a-x86-64.d
@@ -0,0 +1,10 @@
+#source: ifunc-17a.s
+#source: ifunc-17b.s
+#ld: -static -m elf_x86_64
+#as: --64
+#readelf: -s --wide
+#target: x86_64-*-*
+
+#...
+ +[0-9]+: +[0-9a-f]+ +4 +OBJECT +GLOBAL +DEFAULT +[1-9] foo
+#pass
diff --git a/ld/testsuite/ld-ifunc/ifunc-17a.s b/ld/testsuite/ld-ifunc/ifunc-17a.s
new file mode 100644
index 0000000..e0bde49
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-17a.s
@@ -0,0 +1,11 @@
+	.globl main
+	.globl start
+	.globl _start
+	.globl __start
+	.text
+main:
+start:
+_start:
+__start:
+	.byte 0
+	.common	foo,4,4
diff --git a/ld/testsuite/ld-ifunc/ifunc-17b-i386.d b/ld/testsuite/ld-ifunc/ifunc-17b-i386.d
new file mode 100644
index 0000000..82ccac2
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-17b-i386.d
@@ -0,0 +1,10 @@
+#source: ifunc-17b.s
+#source: ifunc-17a.s
+#ld: -static -m elf_i386
+#as: --32
+#readelf: -s --wide
+#target: x86_64-*-* i?86-*-*
+
+#...
+ +[0-9]+: +[0-9a-f]+ +4 +OBJECT +GLOBAL +DEFAULT +[1-9] foo
+#pass
diff --git a/ld/testsuite/ld-ifunc/ifunc-17b-x86-64.d b/ld/testsuite/ld-ifunc/ifunc-17b-x86-64.d
new file mode 100644
index 0000000..7527eae
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-17b-x86-64.d
@@ -0,0 +1,10 @@
+#source: ifunc-17b.s
+#source: ifunc-17a.s
+#ld: -static -m elf_x86_64
+#as: --64
+#readelf: -s --wide
+#target: x86_64-*-*
+
+#...
+ +[0-9]+: +[0-9a-f]+ +4 +OBJECT +GLOBAL +DEFAULT +[1-9] foo
+#pass
diff --git a/ld/testsuite/ld-ifunc/ifunc-17b.s b/ld/testsuite/ld-ifunc/ifunc-17b.s
new file mode 100644
index 0000000..66abe04
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-17b.s
@@ -0,0 +1,6 @@
+	.weak	foo
+	.type foo, %gnu_indirect_function
+	.size	foo,1
+	.text
+foo:
+	.byte	1
diff --git a/ld/testsuite/ld-ifunc/ifunc-common-1.out b/ld/testsuite/ld-ifunc/ifunc-common-1.out
new file mode 100644
index 0000000..31a3ce2
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-common-1.out
@@ -0,0 +1 @@
+PASSED: 0
diff --git a/ld/testsuite/ld-ifunc/ifunc-common-1a.c b/ld/testsuite/ld-ifunc/ifunc-common-1a.c
new file mode 100644
index 0000000..794ca45
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-common-1a.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int foo;
+int
+main ()
+{
+  printf ("PASSED: %d\n", foo);
+  return 0;
+}
diff --git a/ld/testsuite/ld-ifunc/ifunc-common-1b.c b/ld/testsuite/ld-ifunc/ifunc-common-1b.c
new file mode 100644
index 0000000..1235942
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-common-1b.c
@@ -0,0 +1,12 @@
+void alt (void) { }
+
+void foo (void);
+void * foo_ifunc (void) __asm__ ("foo");
+__asm__(".type foo, %gnu_indirect_function");
+__asm__(".weak foo");
+
+void *
+foo_ifunc (void)
+{
+  return alt;
+}
diff --git a/ld/testsuite/ld-ifunc/ifunc.exp b/ld/testsuite/ld-ifunc/ifunc.exp
index 3eef3a9..df913d8 100644
--- a/ld/testsuite/ld-ifunc/ifunc.exp
+++ b/ld/testsuite/ld-ifunc/ifunc.exp
@@ -347,6 +347,27 @@ if { $verbose < 1 } {
     remote_file host delete "tmpdir/static_nonifunc_prog"
 }
 
+run_ld_link_exec_tests [] [list \
+    [list \
+	"Common symbol override ifunc test 1a" \
+	"-static" \
+	"" \
+	{ ifunc-common-1a.c ifunc-common-1b.c } \
+	"ifunc-common-1a" \
+	"ifunc-common-1.out" \
+	"-g" \
+    ] \
+    [list \
+	"Common symbol override ifunc test 1b" \
+	"-static" \
+	"" \
+	{ ifunc-common-1b.c ifunc-common-1a.c } \
+	"ifunc-common-1b" \
+	"ifunc-common-1.out" \
+	"-g" \
+    ] \
+]
+
 set test_list [lsort [glob -nocomplain $srcdir/$subdir/*.d]]
 foreach t $test_list {
     # We need to strip the ".d", but can leave the dirname.