[Patch] Fix build problem found by build robot

[Patch] Fix build problem found by build robot

[Steve Ellcey]

As reported by the build robot in

https://sourceware.org/ml/binutils/2014-11/msg00376.html

some binutils builds are failing, I see it when compiling binutils in 32 bit
mode on an x86 box targeting MIPS.  Compiling the toolchain in 64 bit mode
does not trigger the failure.

The failure is:

cc1: warnings being treated as errors
/scratch/gcc/nightly/src/binutils-gdb/bfd/ecoff.c: In function '_bfd_ecoff_slurp_symbol_table':
/scratch/gcc/nightly/src/binutils-gdb/bfd/ecoff.c:955: warning: comparison between signed and unsigned

Here is my proposed fix for the problem.  I cast bfd_get_symcount (which is 
unsigned int, the type of symcount in the bfd structure) to ptrdiff_t before
comparing it to 'internal_ptr - internal'.  Both of those variables are
pointers.

OK for checkin?

Steve Ellcey
sellcey@imgtec.com



2014-12-02  Steve Ellcey  <sellcey@mips.com>

	* ecoff.c (_bfd_ecoff_slurp_symbol_table): Add cast.


diff --git a/bfd/ecoff.c b/bfd/ecoff.c
index 70783b1..e72e254 100644
--- a/bfd/ecoff.c
+++ b/bfd/ecoff.c
@@ -952,7 +952,7 @@ _bfd_ecoff_slurp_symbol_table (bfd *abfd)
      and ecoff_data (abfd)->debug_info.symbolic_header.ifdMax can mean that
      we have fewer symbols than we were expecting.  Allow for this by updating
      the symbol count and warning the user.  */
-  if (internal_ptr - internal < bfd_get_symcount (abfd))
+  if (internal_ptr - internal < (ptrdiff_t) bfd_get_symcount (abfd))
     {
       bfd_get_symcount (abfd) = internal_ptr - internal;
       (*_bfd_error_handler)

Re: [Patch] Fix build problem found by build robot

[Alan Modra]

On Tue, Dec 02, 2014 at 10:31:45AM -0800, Steve Ellcey  wrote:
> 	* ecoff.c (_bfd_ecoff_slurp_symbol_table): Add cast.

OK.

-- 
Alan Modra
Australia Development Lab, IBM