[binutils-gdb] PR22751, LTO broken for libgcc libcalls

[Alan Modra <amodra at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=d580dcc7aac21dc8396e8e90ea6d05ec32d6cbb9

commit d580dcc7aac21dc8396e8e90ea6d05ec32d6cbb9
Author: Alan Modra <amodra@gmail.com>
Date:   Sun Jan 28 08:03:26 2018 +1030

    PR22751, LTO broken for libgcc libcalls
    
    So what was happening was that the file added from libgcc.a during the
    rescan was not put on file_chain.  map_input_to_output_sections then
    doesn't see the file and its sections are treated as discarded.
    
    The file_chain list pointer bug was caused by that fact that an
    archive element claimed by the plugin does not have my_archive set.
    Or more correctly, the actual archive element does have my_archive
    set, but this bfd is replaced with a dummy bfd that doesn't have
    my_archive set.
    
    	PR 22751
    	* ldlang.c (find_rescan_insertion): Look past bfds with claim_archive
    	set.

Diff:
---
 ld/ChangeLog | 6 ++++++
 ld/ldlang.c  | 3 ++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 3430a86..f32b42f 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,9 @@
+2018-01-28  Alan Modra  <amodra@gmail.com>
+
+	PR 22751
+	* ldlang.c (find_rescan_insertion): Look past bfds with claim_archive
+	set.
+
 2018-01-26  Maciej W. Rozycki  <macro@mips.com>
 
 	* emulparams/elf32mipswindiss.sh (EXTRA_EM_FILE): Set to
diff --git a/ld/ldlang.c b/ld/ldlang.c
index 1526d7b..001039d 100644
--- a/ld/ldlang.c
+++ b/ld/ldlang.c
@@ -7044,7 +7044,8 @@ find_rescan_insertion (lang_input_statement_type *add)
   for (iter = before ? &before->next : &file_chain.head->input_statement.next;
        *iter != NULL;
        iter = &(*iter)->input_statement.next)
-    if ((*iter)->input_statement.the_bfd->my_archive == NULL)
+    if (!(*iter)->input_statement.flags.claim_archive
+	&& (*iter)->input_statement.the_bfd->my_archive == NULL)
       break;
 
   return iter;