PR27311, (symbol from plugin): undefined reference, hidden sym

bfd/
	PR 27311
	* elflink.c (elf_link_add_object_symbols): Don't pull in as-needed
	libraries for IR references on pass over libraries after LTO
	recompilation.
ld/
	* testsuite/ld-plugin/pr27311d.c: New test.
	* testsuite/ld-plugin/lto.exp: Rename pr27311 to pr27311-1, compile
	and link new test as pr27311-2.

(cherry picked from commit 7d409ac)

Author: amodra

bfd/ChangeLog

@@ -1,3 +1,10 @@
+2021-02-04  Alan Modra  <amodra@gmail.com>
+
+	PR 27311
+	* elflink.c (elf_link_add_object_symbols): Don't pull in as-needed
+	libraries for IR references on pass over libraries after LTO
+	recompilation.
+
 2021-02-03  Alan Modra  <amodra@gmail.com>
 
 	PR 27311

bfd/elflink.c

@@ -5279,6 +5279,7 @@ elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
 		   && h->ref_regular_nonweak)
 		  || (old_bfd != NULL
 		      && (old_bfd->flags & BFD_PLUGIN) != 0
+		      && !info->lto_all_symbols_read
 		      && bind != STB_WEAK)
 		  || (h->ref_dynamic_nonweak
 		      && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0

ld/ChangeLog

@@ -1,3 +1,9 @@
+2021-02-04  Alan Modra  <amodra@gmail.com>
+
+	* testsuite/ld-plugin/pr27311d.c: New test.
+	* testsuite/ld-plugin/lto.exp: Rename pr27311 to pr27311-1, compile
+	and link new test as pr27311-2.
+
 2021-02-03  Alan Modra  <amodra@gmail.com>
 
 	Apply from mainline

ld/testsuite/ld-plugin/lto.exp

@@ -424,9 +424,15 @@ set lto_link_elf_tests [list \
   [list {pr27311c.o} \
    {} {-flto} \
    {pr27311c.c} {} {} {c}] \
-  [list {pr27311} \
+  [list {pr27311d.o} \
+   {} {-flto} \
+   {pr27311d.c} {} {} {c}] \
+  [list {pr27311-1} \
    {tmpdir/pr27311c.o -Wl,--no-as-needed,--rpath-link=. tmpdir/pr27311b.so} {} \
-   {dummy.c} {{readelf {--dyn-syms --wide} pr27311.d}} {pr27311}] \
+   {dummy.c} {{readelf {--dyn-syms --wide} pr27311.d}} {pr27311-1}] \
+  [list {pr27311-2} \
+   {tmpdir/pr27311d.o -Wl,--no-as-needed,--rpath-link=. tmpdir/pr27311b.so} {} \
+   {dummy.c} {{readelf {--dyn-syms --wide} pr27311.d}} {pr27311-2}] \
 ]
 
 # PR 14918 checks that libgcc is not spuriously included in a shared link of

ld/testsuite/ld-plugin/pr27311d.c

@@ -0,0 +1,5 @@
+__attribute__((visibility("hidden"))) void inlib1(void) {}
+int main()
+{
+  return 0;
+}