Add a -w option to the linker to suppress warning and error messages.

	PR 29654
	* ld.h (struct ld_config_type): Add no_warnings field.
	* ldlex.h (enum option_values): Add OPTION_NO_WARNINGS.
	* lexsup.c (ld_options): Add --no-warnings.
	(parse_args): Add support for -w and --no-warnings.
	* ldmisc.c (vfinfo): Return early if the message is a warning and
	-w has been enabled.
	* ld.texi (options): Document new command line option.
	* NEWS: Mention the new feature.

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 15cf800a2318fb572f9e615faafed3b01a5b43e5..9ba8cbcfd0bd436b7d4fe592f817fbdf27f53bf5 100644 (file)
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,15 @@
+2022-10-21  Nick Clifton  <nickc@redhat.com>
+
+       PR 29654
+       * ld.h (struct ld_config_type): Add no_warnings field.
+       * ldlex.h (enum option_values): Add OPTION_NO_WARNINGS.
+       * lexsup.c (ld_options): Add --no-warnings.
+       (parse_args): Add support for -w and --no-warnings.
+       * ldmisc.c (vfinfo): Return early if the message is a warning and
+       -w has been enabled.
+       * ld.texi (options): Document new command line option.
+       * NEWS: Mention the new feature.
+
 2022-08-30  Nick Clifton  <nickc@redhat.com>
 
        PR 29529

diff --git a/ld/NEWS b/ld/NEWS
index d7ceb0c68b6a7ff7bd0136cc7e8378f9627f81ba..24df91aa85f20c10f43e11298bb18e10492aedcf 100644 (file)
--- a/ld/NEWS
+++ b/ld/NEWS
@@ -1,7 +1,12 @@
 -*- text -*-
 
+* The linker has a new command line option to suppress the generation of any
+  warning or error messages.  This can be useful when there is a need to create
+  a known non-working binary.  The option is -w or --no-warnings.
+
 * ld now supports zstd compressed debug sections.  The new option
   --compress-debug-sections=zstd compresses debug sections with zstd.
+
 * Add --enable-default-compressed-debug-sections-algorithm={zlib,zstd}
   that selects the default compression algorithm
   for --enable-compressed-debug-sections.

diff --git a/ld/ld.h b/ld/ld.h
index f3086bf30dee354bf4f5e1329bf0ebaec2a939e3..2ac9f469d04a336415571dc99d1983386e806e26 100644 (file)
--- a/ld/ld.h
+++ b/ld/ld.h
@@ -252,9 +252,12 @@ typedef struct
      changes due to the alignment of an input section.  */
   bool warn_section_align;
 
-  /* If TRUE, warning messages are fatal */
+  /* If TRUE, warning messages are fatal.  */
   bool fatal_warnings;
 
+  /* If TRUE, warning and error messages are ignored.  */
+  bool no_warnings;
+
   sort_order sort_common;
 
   bool text_read_only;

diff --git a/ld/ld.texi b/ld/ld.texi
index 9daed2e7e9f09241c2b6a6dd73e1b0661e753849..82527e3652cae9503b1a6a94ded261ba133922b1 100644 (file)
--- a/ld/ld.texi
+++ b/ld/ld.texi
@@ -1876,6 +1876,15 @@ in filename invoked by -R or --just-symbols
 Treat all warnings as errors.  The default behaviour can be restored
 with the option @option{--no-fatal-warnings}.
 
+@kindex -w
+@kindex --no-warnings
+@item -w
+@itemx --no-warnings
+Do not display any warning or error messages.  This overrides
+@option{--fatal-warnings} if it has been enabled.  This option can be
+used when it is known that the output binary will not work, but there
+is still a need to create it.
+
 @kindex --force-exe-suffix
 @item  --force-exe-suffix
 Make sure that an output file has a .exe suffix.

diff --git a/ld/ldlex.h b/ld/ldlex.h
index 894582595c11b59a9f3e9a84fe5dcb784c0e9c41..31b77606a55ed8ea120f628a7b9be1158c605e03 100644 (file)
--- a/ld/ldlex.h
+++ b/ld/ldlex.h
@@ -88,6 +88,7 @@ enum option_values
   OPTION_WARN_CONSTRUCTORS,
   OPTION_WARN_FATAL,
   OPTION_NO_WARN_FATAL,
+  OPTION_NO_WARNINGS,
   OPTION_WARN_MULTIPLE_GP,
   OPTION_WARN_ONCE,
   OPTION_WARN_SECTION_ALIGN,

diff --git a/ld/ldmisc.c b/ld/ldmisc.c
index 3a02f752c38b2e65bae3dff7897371943a518d39..033e9c29c57b6991796161e8bfd09ac08640faaa 100644 (file)
--- a/ld/ldmisc.c
+++ b/ld/ldmisc.c
@@ -95,6 +95,9 @@ vfinfo (FILE *fp, const char *fmt, va_list ap, bool is_warning)
       } type;
   } args[9];
 
+  if (is_warning && config.no_warnings)
+    return;
+  
   for (arg_no = 0; arg_no < sizeof (args) / sizeof (args[0]); arg_no++)
     args[arg_no].type = Bad;
 

diff --git a/ld/lexsup.c b/ld/lexsup.c
index 0068ff5979827386b95312f97f38c0aa6fd41965..d107bd7a34887387ee516bf7f558c3659aeaa613 100644 (file)
--- a/ld/lexsup.c
+++ b/ld/lexsup.c
@@ -381,6 +381,9 @@ static const struct ld_option ld_options[] =
   { {"no-undefined", no_argument, NULL, OPTION_NO_UNDEFINED},
     '\0', NULL, N_("Do not allow unresolved references in object files"),
     TWO_DASHES },
+  { {"no-warnings", no_argument, NULL, OPTION_NO_WARNINGS},
+    'w', NULL, N_("Do not display any warning or error messages"),
+    TWO_DASHES },
   { {"allow-shlib-undefined", no_argument, NULL, OPTION_ALLOW_SHLIB_UNDEFINED},
     '\0', NULL, N_("Allow unresolved references in shared libraries"),
     TWO_DASHES },
@@ -1554,6 +1557,11 @@ parse_args (unsigned argc, char **argv)
        case OPTION_NO_WARN_FATAL:
          config.fatal_warnings = false;
          break;
+       case OPTION_NO_WARNINGS:
+       case 'w':
+         config.no_warnings = true;
+         config.fatal_warnings = false;
+         break;
        case OPTION_WARN_MULTIPLE_GP:
          config.warn_multiple_gp = true;
          break;