[PATCH] nm: Add --quiet to suppress "no symbols" diagnostic

[PATCH] nm: Add --quiet to suppress "no symbols" diagnostic

[Fangrui Song]

	PR binutils/27408
	* readelf.c (quiet): New option flag.
	(display_rel_file): If quiet is enabled, suppress "no symbols".
	(enum long_option_values): New enum to hold long option value.
	(options): Add quiet.
	(main): Handle the new option.
	* NEWS: Mention the new feature.
	* docs/binutils.texi: Document the new feature.
---
 binutils/NEWS              |  3 +++
 binutils/doc/binutils.texi |  5 +++++
 binutils/nm.c              | 17 +++++++++++++----
 3 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/binutils/NEWS b/binutils/NEWS
index b0d55623738..3e4c39b1395 100644
--- a/binutils/NEWS
+++ b/binutils/NEWS
@@ -7,6 +7,9 @@
   restored by the use of the --enable-follow-debug-links=no configure time
   option.
 
+* Nm has a new command line option: --quiet.  This suppresses "no symbols"
+  diagnostic.
+
 Changes in 2.36:
 
 * Update elfedit and readelf with LAM_U48 and LAM_U57 support.
diff --git a/binutils/doc/binutils.texi b/binutils/doc/binutils.texi
index 94ea5720be8..b7740dfc8a4 100644
--- a/binutils/doc/binutils.texi
+++ b/binutils/doc/binutils.texi
@@ -4741,6 +4741,7 @@ readelf [@option{-a}|@option{--all}]
         [@option{-s}|@option{--syms}|@option{--symbols}]
         [@option{--dyn-syms}|@option{--lto-syms}]
         [@option{--demangle@var{=style}}|@option{--no-demangle}]
+        [@option{--quiet}]
         [@option{--recurse-limit}|@option{--no-recurse-limit}]
         [@option{-n}|@option{--notes}]
         [@option{-r}|@option{--relocs}]
@@ -4822,6 +4823,10 @@ file.
 Displays the information contained in the file's segment headers, if it
 has any.
 
+@item --quiet
+@cindex quiet
+Suppress "no symbols" diagnostic.
+
 @item -S
 @itemx --sections
 @itemx --section-headers
diff --git a/binutils/nm.c b/binutils/nm.c
index acfdf665c03..c366d8a5de7 100644
--- a/binutils/nm.c
+++ b/binutils/nm.c
@@ -161,6 +161,7 @@ static int show_version = 0;	/* Show the version number.  */
 static int show_synthetic = 0;	/* Display synthesized symbols too.  */
 static int line_numbers = 0;	/* Print line numbers for symbols.  */
 static int allow_special_symbols = 0;  /* Allow special symbols.  */
+static int quiet = 0;		/* Suppress "no symbols" diagnostic.  */
 
 /* The characters to use for global and local ifunc symbols.  */
 #if DEFAULT_F_FOR_IFUNC_SYMBOLS
@@ -200,7 +201,8 @@ enum long_option_values
   OPTION_RECURSE_LIMIT,
   OPTION_NO_RECURSE_LIMIT,
   OPTION_IFUNC_CHARS,
-  OPTION_WITH_SYMBOL_VERSIONS
+  OPTION_WITH_SYMBOL_VERSIONS,
+  OPTION_QUIET
 };
 
 static struct option long_options[] =
@@ -224,6 +226,7 @@ static struct option long_options[] =
   {"print-armap", no_argument, &print_armap, 1},
   {"print-file-name", no_argument, 0, 'o'},
   {"print-size", no_argument, 0, 'S'},
+  {"quiet", no_argument, 0, OPTION_QUIET},
   {"radix", required_argument, 0, 't'},
   {"recurse-limit", no_argument, NULL, OPTION_RECURSE_LIMIT},
   {"recursion-limit", no_argument, NULL, OPTION_RECURSE_LIMIT},
@@ -1130,7 +1133,8 @@ display_rel_file (bfd *abfd, bfd *archive_bfd)
     {
       if (!(bfd_get_file_flags (abfd) & HAS_SYMS))
 	{
-	  non_fatal (_("%s: no symbols"), bfd_get_filename (abfd));
+	  if (!quiet)
+	    non_fatal (_("%s: no symbols"), bfd_get_filename (abfd));
 	  return;
 	}
     }
@@ -1140,7 +1144,8 @@ display_rel_file (bfd *abfd, bfd *archive_bfd)
     {
       if (dynamic && bfd_get_error () == bfd_error_no_symbols)
 	{
-	  non_fatal (_("%s: no symbols"), bfd_get_filename (abfd));
+	  if (!quiet)
+	    non_fatal (_("%s: no symbols"), bfd_get_filename (abfd));
 	  return;
 	}
 
@@ -1149,7 +1154,8 @@ display_rel_file (bfd *abfd, bfd *archive_bfd)
 
   if (symcount == 0)
     {
-      non_fatal (_("%s: no symbols"), bfd_get_filename (abfd));
+      if (!quiet)
+	non_fatal (_("%s: no symbols"), bfd_get_filename (abfd));
       return;
     }
 
@@ -1776,6 +1782,9 @@ main (int argc, char **argv)
 	case OPTION_WITH_SYMBOL_VERSIONS:
 	  /* Ignored for backward compatibility.  */
 	  break;
+	case OPTION_QUIET:
+	  quiet = 1;
+	  break;
 	case 'D':
 	  dynamic = 1;
 	  break;
-- 
2.30.0.478.g8a0d178c01-goog

Re: [PATCH] nm: Add --quiet to suppress "no symbols" diagnostic

[Fangrui Song]

On 2021-02-12, Fangrui Song via Binutils wrote:
>	PR binutils/27408
>	* readelf.c (quiet): New option flag.
>	(display_rel_file): If quiet is enabled, suppress "no symbols".
>	(enum long_option_values): New enum to hold long option value.
>	(options): Add quiet.
>	(main): Handle the new option.
>	* NEWS: Mention the new feature.
>	* docs/binutils.texi: Document the new feature.

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