Check incompatible existing default symbol definition

After resolving a versioned reference, foo@VER1, to a default versioned
definition, foo@@VER1, from a shared object, we also merge it with
the existing regular default symbol definition, foo.  When foo is IFUNC
and foo@@VER1 aren't, we will merge 2 incompatible definitions.  This
patch avoids merging foo@@VER1 definition with foo definition if
one is IFUNC and the other isn't.

8 files changed, 76 insertions, 0 deletions

diff --git a/ld/testsuite/ld-ifunc/dummy.c b/ld/testsuite/ld-ifunc/dummy.c
new file mode 100644
index 0000000..5c03287
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/dummy.c
@@ -0,0 +1 @@
+/* An empty file.  */
diff --git a/ld/testsuite/ld-ifunc/ifunc.exp b/ld/testsuite/ld-ifunc/ifunc.exp
index fb106c6..d7ff445 100644
--- a/ld/testsuite/ld-ifunc/ifunc.exp
+++ b/ld/testsuite/ld-ifunc/ifunc.exp
@@ -349,6 +349,42 @@ if { $verbose < 1 } {
     remote_file host delete "tmpdir/static_nonifunc_prog"
 }
 
+run_cc_link_tests [list \
+    [list \
+	"Build libpr16467a.so" \
+	"-shared -Wl,--version-script=pr16467a.map" \
+	"-fPIC" \
+	{ pr16467a.c } \
+	{} \
+	"libpr16467a.so" \
+    ] \
+    [list \
+	"Build libpr16467b.a" \
+	"" \
+	"-fPIC" \
+	{ pr16467b.c } \
+	{} \
+	"libpr16467b.a" \
+    ] \
+    [list \
+	"Build libpr16467b.so" \
+	"-shared tmpdir/pr16467b.o tmpdir/libpr16467a.so \
+	 -Wl,--version-script=pr16467b.map" \
+	"-fPIC" \
+	{ dummy.c } \
+	{} \
+	"libpr16467b.so" \
+    ] \
+    [list \
+	"Build libpr16467c.a" \
+	"" \
+	"" \
+	{ pr16467c.c } \
+	{} \
+	"libpr16467c.a" \
+    ] \
+]
+
 run_ld_link_exec_tests [] [list \
     [list \
 	"Common symbol override ifunc test 1a" \
@@ -368,6 +404,15 @@ run_ld_link_exec_tests [] [list \
 	"ifunc-common-1.out" \
 	"-g" \
     ] \
+    [list \
+	"Run pr16467" \
+	"tmpdir/pr16467c.o tmpdir/libpr16467b.so tmpdir/libpr16467a.so" \
+	"" \
+	{ dummy.c } \
+	"pr16467" \
+	"pr16467.out" \
+	"" \
+    ] \
 ]
 
 set test_list [lsort [glob -nocomplain $srcdir/$subdir/*.d]]
diff --git a/ld/testsuite/ld-ifunc/pr16467.out b/ld/testsuite/ld-ifunc/pr16467.out
new file mode 100644
index 0000000..d86bac9
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/pr16467.out
@@ -0,0 +1 @@
+OK
diff --git a/ld/testsuite/ld-ifunc/pr16467a.c b/ld/testsuite/ld-ifunc/pr16467a.c
new file mode 100644
index 0000000..ae3f084
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/pr16467a.c
@@ -0,0 +1,5 @@
+const char * 
+sd_get_seats(void)
+{
+  return "OK";
+}
diff --git a/ld/testsuite/ld-ifunc/pr16467a.map b/ld/testsuite/ld-ifunc/pr16467a.map
new file mode 100644
index 0000000..d677f37
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/pr16467a.map
@@ -0,0 +1,4 @@
+LIBSYSTEMD_209 {
+global:
+        sd_get_seats;
+};
diff --git a/ld/testsuite/ld-ifunc/pr16467b.c b/ld/testsuite/ld-ifunc/pr16467b.c
new file mode 100644
index 0000000..264f6cf
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/pr16467b.c
@@ -0,0 +1,7 @@
+void new_sd_get_seats(void);
+__asm__(".symver new_sd_get_seats,sd_get_seats@LIBSYSTEMD_209");
+void (*resolve_sd_get_seats(void)) (void) __asm__ ("sd_get_seats");
+void (*resolve_sd_get_seats(void)) (void) {
+        return new_sd_get_seats;
+}
+__asm__(".type sd_get_seats, %gnu_indirect_function");
diff --git a/ld/testsuite/ld-ifunc/pr16467b.map b/ld/testsuite/ld-ifunc/pr16467b.map
new file mode 100644
index 0000000..1f263de
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/pr16467b.map
@@ -0,0 +1,4 @@
+LIBSYSTEMD_208 {
+global:
+        sd_get_seats;
+};
diff --git a/ld/testsuite/ld-ifunc/pr16467c.c b/ld/testsuite/ld-ifunc/pr16467c.c
new file mode 100644
index 0000000..e2a901c
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/pr16467c.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+const char* sd_get_seats(void);
+
+int
+main (int argc, char **argv)
+{
+  printf("%s\n", sd_get_seats());
+  return 0;
+}