Skip IFUNC relocations in debug sections

Skip IFUNC relocations in debug sections ignored by ld.so.

bfd/

	PR ld/18808
	* elf32-i386.c (elf_i386_relocate_section): Skip IFUNC
	relocations in debug sections.
	* elf64-x86-64.c (elf_x86_64_relocate_section): Likewise.

ld/testsuite/

	PR ld/18808
	* ld-ifunc/ifunc.exp: Add a test for PR ld/18808.
	* ld-ifunc/pr18808.out: New file.
	* ld-ifunc/pr18808a.c: Likewise.
	* ld-ifunc/pr18808b.c: Likewise.

4 files changed, 61 insertions, 0 deletions

diff --git a/ld/testsuite/ld-ifunc/ifunc.exp b/ld/testsuite/ld-ifunc/ifunc.exp
index e08261b..498cb2d 100644
--- a/ld/testsuite/ld-ifunc/ifunc.exp
+++ b/ld/testsuite/ld-ifunc/ifunc.exp
@@ -457,3 +457,30 @@ run_ld_link_exec_tests [] [list \
 	"-fpic" \
     ] \
 ]
+
+# Run-time tests which require working ifunc attribute support.
+if { ![check_ifunc_attribute_available] } {
+    return
+}
+
+run_cc_link_tests [list \
+    [list \
+	"Build libpr18808.so" \
+	"-shared" \
+	"-fPIC -O2 -g" \
+	{ pr18808b.c } \
+	{} \
+	"libpr18808.so" \
+    ] \
+]
+
+run_ld_link_exec_tests [] [list \
+    [list \
+	"Run pr18808" \
+	"tmpdir/libpr18808.so" \
+	"" \
+	{ pr18808a.c } \
+	"pr18808" \
+	"pr18808.out" \
+    ] \
+]
diff --git a/ld/testsuite/ld-ifunc/pr18808.out b/ld/testsuite/ld-ifunc/pr18808.out
new file mode 100644
index 0000000..d86bac9
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/pr18808.out
@@ -0,0 +1 @@
+OK
diff --git a/ld/testsuite/ld-ifunc/pr18808a.c b/ld/testsuite/ld-ifunc/pr18808a.c
new file mode 100644
index 0000000..35228ae
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/pr18808a.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+void bar(void);
+int main(void)
+{
+  bar();
+  printf("OK\n");
+  return 0;
+}
diff --git a/ld/testsuite/ld-ifunc/pr18808b.c b/ld/testsuite/ld-ifunc/pr18808b.c
new file mode 100644
index 0000000..6f0db5a
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/pr18808b.c
@@ -0,0 +1,24 @@
+int foo (int x) __attribute__ ((ifunc ("resolve_foo")));
+extern void abort (void);
+
+static int foo_impl(int x)
+{
+  return x;
+}
+
+int bar()
+{
+  int (*f)(int) = foo;
+
+  if (foo (5) != 5)
+    abort ();
+
+  if (f(42) != 42)
+    abort ();
+}
+
+
+void *resolve_foo (void)
+{
+  return (void *) foo_impl;
+}