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ld --print-output-format switch

This adds an ld option --print-output-format.  The intent is to provide
some technique better than ld --verbose and matching the OUTPUT_FORMAT
command at the beginning of the linker script.  (Library packages building
a trivial input-only linker script need to give it the right OUTPUT_FORMAT
command to ensure it gets accepted or skipped appropriately for the current
target in biarch installations.)

This emits just one target, never a triple as OUTPUT_FORMAT could take
for endian-switchable targets.  I think it will emit the right one when
used with -EB or -EL on configurations where those are meaningful, but I
haven't tested such a target.

Ok for trunk?

If this goes in, someone should implement it for gold as well.
It was not very obvious to me how to go about it there.


2011-06-11  Roland McGrath  <>

	* ld.h (args_type): New field print_output_format.
	* lexsup.c (enum option_values, ld_options, parse_args):
	Handle --print-output-format.
	* ldmain.c (main): Implement --print-output-format.
	* ld.texinfo (Options): Document it.

diff --git a/ld/ld.h b/ld/ld.h
index 9391923..138fdec 100644
--- a/ld/ld.h
+++ b/ld/ld.h
@@ -199,6 +199,9 @@ typedef struct {
      input files.  */
   bfd_boolean accept_unknown_input_arch;
+  /* If TRUE we'll just print the default output on stdout.  */
+  bfd_boolean print_output_format;
   /* Big or little endian as set on command line.  */
   enum endian_enum endian;
diff --git a/ld/ld.texinfo b/ld/ld.texinfo
index 0b58396..c8ac331 100644
--- a/ld/ld.texinfo
+++ b/ld/ld.texinfo
@@ -1401,6 +1401,13 @@ default behaviour (of not listing the sections that are removed) can
 be restored by specifying @samp{--no-print-gc-sections} on the command
+@kindex --print-output-format
+@cindex output format
+@item --print-output-format
+Print the name of the default output format (perhaps influenced by
+other command-line options).  This is the string that would appear
+in an @code{OUTPUT_FORMAT} linker script command (@pxref{File Commands}).
 @cindex help
 @cindex usage
 @kindex --help
diff --git a/ld/ldmain.c b/ld/ldmain.c
index 1b4afff..88e34f0 100644
--- a/ld/ldmain.c
+++ b/ld/ldmain.c
@@ -427,11 +427,14 @@ main (int argc, char **argv)
       info_msg ("\n==================================================\n");
+  if (command_line.print_output_format)
+    info_msg ("%s\n", default_target);
   lang_final ();
   if (!lang_has_input_file)
-      if (version_printed)
+      if (version_printed || command_line.print_output_format)
 	xexit (0);
       einfo (_("%P%F: no input files\n"));
diff --git a/ld/lexsup.c b/ld/lexsup.c
index 08ef107..b5e52a8 100644
--- a/ld/lexsup.c
+++ b/ld/lexsup.c
@@ -175,6 +175,7 @@ enum option_values
 #endif /* ENABLE_PLUGINS */
 /* The long options.  This structure is used for both the option
@@ -491,6 +492,8 @@ static const struct ld_option ld_options[] =
   { {"oformat", required_argument, NULL, OPTION_OFORMAT},
     '\0', N_("TARGET"), N_("Specify target of output file"),
+  { {"print-output-format", no_argument, NULL, OPTION_PRINT_OUTPUT_FORMAT},
+    '\0', NULL, N_("Print default output format"), TWO_DASHES },
   { {"qmagic", no_argument, NULL, OPTION_IGNORE},
     '\0', NULL, N_("Ignored for Linux compatibility"), ONE_DASH },
   { {"reduce-memory-overheads", no_argument, NULL,
@@ -1059,6 +1062,9 @@ parse_args (unsigned argc, char **argv)
 	  lang_add_output_format (optarg, NULL, NULL, 0);
+	  command_line.print_output_format = TRUE;
+	  break;
 	  if (plugin_opt_plugin (optarg))

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