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ld --print-output-format switch
- From: Roland McGrath <roland at hack dot frob dot com>
- To: binutils at sourceware dot org
- Date: Sat, 11 Jun 2011 01:06:08 -0700 (PDT)
- Subject: 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.
Thanks,
Roland
ld/
2011-06-11 Roland McGrath <roland@hack.frob.com>
* 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
line.
+@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
OPTION_PLUGIN_OPT,
#endif /* ENABLE_PLUGINS */
OPTION_DEFAULT_SCRIPT,
+ OPTION_PRINT_OUTPUT_FORMAT,
};
/* 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"),
EXACTLY_TWO_DASHES },
+ { {"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)
case OPTION_OFORMAT:
lang_add_output_format (optarg, NULL, NULL, 0);
break;
+ case OPTION_PRINT_OUTPUT_FORMAT:
+ command_line.print_output_format = TRUE;
+ break;
#ifdef ENABLE_PLUGINS
case OPTION_PLUGIN:
if (plugin_opt_plugin (optarg))