gas -Z flag

[Alan Modra <amodra at gmail dot com>]

-Z is supposed to "generate object file even after errors".  It
doesn't do so at the moment, unless you count a zero length object
file as useful output.  Fixed for most targets as follows.
I suspect avr and pru might need target patches.

	* output-file.c (output_file_close): Do a normal close when
	flag_always_generate_output.
	* write.c (write_object_file): Don't stop output when
	flag_always_generate_output.

diff --git a/gas/output-file.c b/gas/output-file.c
index 1781d82f22..573598101c 100644
--- a/gas/output-file.c
+++ b/gas/output-file.c
@@ -58,7 +58,7 @@ output_file_close (const char *filename)
     return;
 
   /* Close the bfd.  */
-  if (had_errors ())
+  if (!flag_always_generate_output && had_errors ())
     res = bfd_cache_close_all ();
   else
     res = bfd_close (stdoutput);
diff --git a/gas/write.c b/gas/write.c
index 5d9a239422..dfbbc7cb9b 100644
--- a/gas/write.c
+++ b/gas/write.c
@@ -2429,7 +2429,7 @@ write_object_file (void)
 #endif
 
   /* Stop if there is an error.  */
-  if (had_errors ())
+  if (!flag_always_generate_output && had_errors ())
     return;
 
   /* Now that all the sizes are known, and contents correct, we can

-- 
Alan Modra
Australia Development Lab, IBM