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From: "Pierre Muller" <muller AT ics DOT u-strasbg DOT fr>
To: <djgpp-workers AT delorie DOT com>
Cc: "'Eli Zaretskii'" <eliz AT gnu DOT org>
Subject: Beta GNU binutils troubles solved
Date: Thu, 14 May 2009 01:22:23 +0200
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Reply-To: djgpp-workers AT delorie DOT com


  I was trying for a long time to use beta DJGPP
libraries to compile binutils and gdb.

  2.03 had the problem that scanf was not supported
enough for gdb..
  Eli, how did you solve this issue?

  objdump always failed miserably telling that it could not
detect the object format.

  After some intense debugging I finally found the
bug.
  It is located in fseeko64 function that is called from
bfd_seek.
  fseeko64 uses llseek but forgets about the 
other fields of the FILE pointer _stream.
  Simply putting _cnt field to 0 was enough
to solve the problems inside bfd and I got a
working gdb from CVS source little time later :)


Pierre Muller
Pascal language support maintainer for GDB

A real fix is to probably copy the code from fseek
to fseeko64...



Index: ansi/stdio/fflush.c
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/ansi/stdio/fflush.c,v
retrieving revision 1.11
diff -u -p -r1.11 fflush.c
--- ansi/stdio/fflush.c	29 Jan 2003 01:28:34 -0000	1.11
+++ ansi/stdio/fflush.c	13 May 2009 23:13:41 -0000
@@ -77,5 +77,11 @@ fflush(FILE *f)
     f->_flag &= ~(_IOWRT|_IOREAD);
     f->_ptr = f->_base;
   }
+  if (f->_flag & _IOREAD)
+  {
+    f->_cnt = 0;
+    f->_ptr = f->_base;
+  }
+
   return 0;
 }
Index: compat/stdio/fseeko64.c
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/compat/stdio/fseeko64.c,v
retrieving revision 1.1
diff -u -p -r1.1 fseeko64.c
--- compat/stdio/fseeko64.c	11 Dec 2007 07:48:42 -0000	1.1
+++ compat/stdio/fseeko64.c	13 May 2009 23:13:42 -0000
@@ -17,6 +17,10 @@ fseeko64(FILE *_stream, off64_t _offset,
   o = llseek(fileno(_stream), _offset, _mode);
   if (o == -1)
     return -1;
+  if (_stream)
+    {
+      _stream->_cnt = 0;
+    }
   return 0;
 }