Re: syms_from_objfile() warnings and win32-nat.c IO redirection (Was: suppress annoying warnings about cygwin1.dbg)

[Pedro Alves <pedro_alves at portugalmail dot pt>]

Brian Dessent wrote:
> Daniel Jacobowitz wrote:
>
> Unfortunately, current HEAD is nearly unusable right now on Cygwin. 

I shook a bit when I read "unusable" :)  That's a pretty strong word.

> If you do this in insight it's much worse as every one of those warnings
> gets its own popup message box, which means twelve annoying things to
> dismiss before you can even start to debug.  And on top of that, some of
> these messages somehow end up spuriously appearing in with the program
> display pane in insight (see attached PNG).  I guess there's some kind
> of filter in the insight code that needs updating, but preferrably these
> warnings shouldn't even be generated.

I've had this fixed here for a while.  It goes on the direction of removing
the warnings, and removing the warning suppressing on win32-nat.c.  Could
you test it with cygwin1.dbg and with insight?

Cheers,
Pedro Alves

2007-10-09  Pedro Alves  <pedro_alves@portugalmail.pt>

	* symfile.c (syms_from_objfile): Don't warn if loadable
	sections are not found.

---
 gdb/symfile.c   |   29 +++++++++--------------
 gdb/win32-nat.c |   70 --------------------------------------------------------
 2 files changed, 13 insertions(+), 86 deletions(-)

Index: src/gdb/symfile.c
===================================================================
--- src.orig/gdb/symfile.c	2007-10-08 23:45:50.000000000 +0100
+++ src/gdb/symfile.c	2007-10-13 01:51:40.000000000 +0100
@@ -822,18 +822,18 @@ syms_from_objfile (struct objfile *objfi
 	bfd_map_over_sections (objfile->obfd, find_lowest_section,
 			       &lower_sect);
       if (lower_sect == NULL)
-	warning (_("no loadable sections found in added symbol-file %s"),
-		 objfile->name);
-      else
-	if ((bfd_get_section_flags (objfile->obfd, lower_sect) & SEC_CODE) == 0)
-	  warning (_("Lowest section in %s is %s at %s"),
-		   objfile->name,
-		   bfd_section_name (objfile->obfd, lower_sect),
-		   paddr (bfd_section_vma (objfile->obfd, lower_sect)));
-      if (lower_sect != NULL)
- 	lower_offset = bfd_section_vma (objfile->obfd, lower_sect);
-      else
  	lower_offset = 0;
+      else
+	{
+	  int flags = bfd_get_section_flags (objfile->obfd, lower_sect);
+	  if (flags == 0)
+	    warning (_("Lowest section in %s is %s at %s"),
+		     objfile->name,
+		     bfd_section_name (objfile->obfd, lower_sect),
+		     paddr (bfd_section_vma (objfile->obfd, lower_sect)));
+
+	  lower_offset = bfd_section_vma (objfile->obfd, lower_sect);
+	}
 
       /* Calculate offsets for the loadable sections.
  	 FIXME! Sections must be in order of increasing loadable section
@@ -860,12 +860,7 @@ syms_from_objfile (struct objfile *objfi
                     addrs->other[i].sectindex = sect->index ;
                   }
                 else
-                  {
-                    warning (_("section %s not found in %s"),
-                             addrs->other[i].name,
-                             objfile->name);
-                    addrs->other[i].addr = 0;
-                  }
+		  addrs->other[i].addr = 0;
               }
             else
               addrs->other[i].addr = lower_offset;
Index: src/gdb/win32-nat.c
===================================================================
--- src.orig/gdb/win32-nat.c	2007-10-13 01:51:10.000000000 +0100
+++ src/gdb/win32-nat.c	2007-10-13 01:51:40.000000000 +0100
@@ -525,19 +525,6 @@ failed:
   return 0;
 }
 
-/* Encapsulate the information required in a call to
-   symbol_file_add_args */
-struct safe_symbol_file_add_args
-{
-  char *name;
-  int from_tty;
-  struct section_addr_info *addrs;
-  int mainline;
-  int flags;
-  struct ui_file *err, *out;
-  struct objfile *ret;
-};
-
 /* Maintain a linked list of "so" information. */
 struct lm_info
 {
@@ -546,61 +533,6 @@ struct lm_info
 
 static struct so_list solib_start, *solib_end;
 
-/* Call symbol_file_add with stderr redirected.  We don't care if there
-   are errors. */
-static int
-safe_symbol_file_add_stub (void *argv)
-{
-#define p ((struct safe_symbol_file_add_args *) argv)
-  struct so_list *so = &solib_start;
-
-  p->ret = symbol_file_add (p->name, p->from_tty, p->addrs, p->mainline, p->flags);
-  return !!p->ret;
-#undef p
-}
-
-/* Restore gdb's stderr after calling symbol_file_add */
-static void
-safe_symbol_file_add_cleanup (void *p)
-{
-#define sp ((struct safe_symbol_file_add_args *)p)
-  gdb_flush (gdb_stderr);
-  gdb_flush (gdb_stdout);
-  ui_file_delete (gdb_stderr);
-  ui_file_delete (gdb_stdout);
-  gdb_stderr = sp->err;
-  gdb_stdout = sp->out;
-#undef sp
-}
-
-/* symbol_file_add wrapper that prevents errors from being displayed. */
-static struct objfile *
-safe_symbol_file_add (char *name, int from_tty,
-		      struct section_addr_info *addrs,
-		      int mainline, int flags)
-{
-  struct safe_symbol_file_add_args p;
-  struct cleanup *cleanup;
-
-  cleanup = make_cleanup (safe_symbol_file_add_cleanup, &p);
-
-  p.err = gdb_stderr;
-  p.out = gdb_stdout;
-  gdb_flush (gdb_stderr);
-  gdb_flush (gdb_stdout);
-  gdb_stderr = ui_file_new ();
-  gdb_stdout = ui_file_new ();
-  p.name = name;
-  p.from_tty = from_tty;
-  p.addrs = addrs;
-  p.mainline = mainline;
-  p.flags = flags;
-  catch_errors (safe_symbol_file_add_stub, &p, "", RETURN_MASK_ERROR);
-
-  do_cleanups (cleanup);
-  return p.ret;
-}
-
 static struct so_list *
 win32_make_so (const char *name, DWORD load_addr)
 {
@@ -801,7 +733,7 @@ dll_symbol_command (char *args, int from
       args = newargs;
     }
 
-  safe_symbol_file_add (args, from_tty, NULL, 0, OBJF_SHARED | OBJF_USERLOADED);
+  symbol_file_add (args, from_tty, NULL, 0, OBJF_SHARED | OBJF_USERLOADED);
 }
 
 /* Handle DEBUG_STRING output from child process.