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Broken -frepo (was Re: PATCH: PR ld/1396: prohibited cross reference to a local symbol)

Jakub Jelinek jakub@redhat.com
Fri Mar 31 00:14:00 GMT 2006 
On Thu, Mar 30, 2006 at 07:15:54AM -0800, H. J. Lu wrote:
> When .o file isn't compiled with -g, the old linker outputs:
> 
> lib.o: In function `bar':
> : prohibited cross reference from .text to `foo' in .foo
> 
> I changed it to one line:
> 
> lib.o: In function `bar': prohibited cross reference from .text to `foo' in .foo
> 
> I have no strong opinion one way or the other.

Digging some more into vfinfo, this sounds very wrong.
<bfd>: In function `function':
is on a separate line for a reason - if there is more than one error
with the same bfd/filename/function, ld will emit it just once, and with
In function on the same line that's just plain ugly (in addition that it
breaks tools that parse ld output).  Say:

a.o: In function `main':a.C:(.text+0xd): undefined reference to `C<int>::C()'
a.C:(.text+0x2b): undefined reference to `foobar'

where previously we would print here:

a.o: In function `main':
a.C:(.text+0xd): undefined reference to `C<int>::C()'
a.C:(.text+0x2b): undefined reference to `foobar'

(in both cases the In function `main' is for both errors, but it is really
non-obvious in the first case).

The reason why you got the ugly

lib.o: In function `bar':
: prohibited cross reference from .text to `foo' in .foo

is IMHO because ld just failed to print the location.
When bfd_find_nearest_line fails, it will for %C print:
lib.o:(.text+0x7): prohibited cross reference from .text to `foo' in .foo
so I don't understand why it doesn't provide section/offset also when it
knows the function name, but doesn't know file/line.  The following patch
reverts the ldmisc.c changes from last October and makes ld print for your
testcase (if I revert the ldcref.c fix, otherwise I don't get the error
obviously)
lib.o: In function `bar':
(.text+0x7): prohibited cross reference from .text to `foo' in .foo

Ok for trunk?

2006-03-30  Jakub Jelinek  <jakub@redhat.com>

	* ldmisc.c (vfinfo): Revert 2005-10-05 changes.  If
	bfd_find_nearest_line succeeded for %C or %D, but filename
	is NULL, print section+offset at the end.

--- ld/ldmisc.c.jj	2005-12-14 13:50:35.000000000 +0100
+++ ld/ldmisc.c	2006-03-30 18:23:59.000000000 +0200
@@ -1,6 +1,6 @@
 /* ldmisc.c
    Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
-   2001, 2002, 2003, 2004, 2005
+   2001, 2002, 2003, 2004, 2005, 2006
    Free Software Foundation, Inc.
    Written by Steve Chamberlain of Cygnus Support.
 
@@ -337,7 +337,7 @@ vfinfo (FILE *fp, const char *fmt, va_li
 				&& strcmp (last_file, filename) != 0)
 			    || strcmp (last_function, functionname) != 0)
 			  {
-			    lfinfo (fp, _("%B: In function `%T'"),
+			    lfinfo (fp, _("%B: In function `%T':\n"),
 				    abfd, functionname);
 
 			    last_bfd = abfd;
@@ -353,20 +353,17 @@ vfinfo (FILE *fp, const char *fmt, va_li
 			discard_last = FALSE;
 		      }
 		    else
-		      lfinfo (fp, "%B", abfd);
+		      lfinfo (fp, "%B:", abfd);
 
 		    if (filename != NULL)
-		      fprintf (fp, ":%s", filename);
+		      fprintf (fp, "%s:", filename);
 
 		    if (functionname != NULL && fmt[-1] == 'G')
-		      lfinfo (fp, ":%T", functionname);
-		    else if (filename != NULL)
-		      {
-			if (linenumber != 0)
-			  fprintf (fp, ":%u", linenumber);
-			else
-			  lfinfo (fp, ":(%A+0x%v)", section, offset);
-		      }
+		      lfinfo (fp, "%T", functionname);
+		    else if (filename != NULL && linenumber != 0)
+		      fprintf (fp, "%u", linenumber);
+		    else
+		      lfinfo (fp, "(%A+0x%v)", section, offset);
 		  }
 		else
 		  lfinfo (fp, "%B:(%A+0x%v)", abfd, section, offset);


	Jakub
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