2004-11-18  Andrew Cagney  <cagney@gnu.org>

        * dwarf2read.c: Include "top.c".
        (dwarf2_has_info): Check for readnever_symbol_files.
        * symfile.c (readnever_symbol_files): Define.
        * top.h (readnever_symbol_files): Declare.
        * main.c (captured_main): Add --readnever option.
        (print_gdb_help): Ditto.

2004-11-18  Andrew Cagney  <cagney@gnu.org>

        * gdb.texinfo (File Options): Document --readnever.

Index: gdb-7.2.50.20101116/gdb/doc/gdb.texinfo
===================================================================
--- gdb-7.2.50.20101116.orig/gdb/doc/gdb.texinfo	2010-11-12 21:49:41.000000000 +0100
+++ gdb-7.2.50.20101116/gdb/doc/gdb.texinfo	2010-11-16 07:59:31.000000000 +0100
@@ -1001,6 +1001,12 @@ Read each symbol file's entire symbol ta
 the default, which is to read it incrementally as it is needed.
 This makes startup slower, but makes future operations faster.
 
+@item --readnever
+@cindex @code{--readnever}
+Do not read each symbol file's symbolic debug information.  This makes
+startup faster but at the expense of not being able to perform
+symbolic debugging.
+
 @end table
 
 @node Mode Options
Index: gdb-7.2.50.20101116/gdb/main.c
===================================================================
--- gdb-7.2.50.20101116.orig/gdb/main.c	2010-11-16 07:59:20.000000000 +0100
+++ gdb-7.2.50.20101116/gdb/main.c	2010-11-16 07:59:59.000000000 +0100
@@ -390,6 +390,7 @@ captured_main (void *data)
       {"xdb", no_argument, &xdb_commands, 1},
       {"dbx", no_argument, &dbx_commands, 1},
       {"readnow", no_argument, &readnow_symbol_files, 1},
+      {"readnever", no_argument, &readnever_symbol_files, 1},
       {"r", no_argument, &readnow_symbol_files, 1},
       {"quiet", no_argument, &quiet, 1},
       {"q", no_argument, &quiet, 1},
@@ -982,6 +983,7 @@ Options:\n\n\
   fputs_unfiltered (_(" file.\n\
   --quiet            Do not print version number on startup.\n\
   --readnow          Fully read symbol files on first access.\n\
+  --readnever        Do not read symbol files.\n\
 "), stream);
   fputs_unfiltered (_("\
   --se=FILE          Use FILE as symbol file and executable file.\n\
Index: gdb-7.2.50.20101116/gdb/symfile.c
===================================================================
--- gdb-7.2.50.20101116.orig/gdb/symfile.c	2010-10-17 20:49:46.000000000 +0200
+++ gdb-7.2.50.20101116/gdb/symfile.c	2010-11-16 07:59:31.000000000 +0100
@@ -80,6 +80,7 @@ static void clear_symtab_users_cleanup (
 
 /* Global variables owned by this file */
 int readnow_symbol_files;	/* Read full symbols immediately */
+int readnever_symbol_files;	/* Never read full symbols.  */
 
 /* External variables and functions referenced. */
 
Index: gdb-7.2.50.20101116/gdb/dwarf2read.c
===================================================================
--- gdb-7.2.50.20101116.orig/gdb/dwarf2read.c	2010-11-16 07:54:02.000000000 +0100
+++ gdb-7.2.50.20101116/gdb/dwarf2read.c	2010-11-16 08:00:18.000000000 +0100
@@ -57,6 +57,7 @@
 #include "vec.h"
 #include "c-lang.h"
 #include "valprint.h"
+#include "top.h"
 
 #include <fcntl.h>
 #include "gdb_string.h"
@@ -1356,8 +1357,9 @@ dwarf2_has_info (struct objfile *objfile
       bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections, NULL);
       dwarf2_per_objfile->objfile = objfile;
     }
-  return (dwarf2_per_objfile->info.asection != NULL
-	  && dwarf2_per_objfile->abbrev.asection != NULL);
+  return (! readnever_symbol_files
+	  && (dwarf2_per_objfile->info.asection != NULL
+	      && dwarf2_per_objfile->abbrev.asection != NULL));
 }
 
 /* When loading sections, we can either look for ".<name>", or for
Index: gdb-7.2.50.20101116/gdb/top.h
===================================================================
--- gdb-7.2.50.20101116.orig/gdb/top.h	2010-04-07 18:54:39.000000000 +0200
+++ gdb-7.2.50.20101116/gdb/top.h	2010-11-16 07:59:31.000000000 +0100
@@ -61,6 +61,7 @@ extern void set_prompt (char *);
 
 /* From random places.  */
 extern int readnow_symbol_files;
+extern int readnever_symbol_files;
 
 /* Perform _initialize initialization */
 extern void gdb_init (char *);