[Bug c++/63789] New: g++ -m32 on solaris has trouble finding abs with int64_t

[richard at netbsd dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63789

            Bug ID: 63789
           Summary: g++ -m32 on solaris has trouble finding abs with
                    int64_t
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: richard at netbsd dot org

with the following simplified test program (tabs.cc):
==================>8===============
#include <stdint.h>
#include <stdlib.h>

int64_t tabs(int64_t foo)
{
    return    abs(foo);
}
=================>8================

building with g++ -m32 -c tabs.cc gives the following error:
>tabs.cc: In function ‘int64_t tabs(int64_t)’:
>tabs.cc:6:16: error: call of overloaded ‘abs(int64_t&)’ is ambiguous
>  return abs(foo);
>                ^
>tabs.cc:6:16: note: candidates are:
>In file included from /usr/include/stdlib.h:37:0,
>                 from tabs.cc:2:
>/usr/include/iso/stdlib_iso.h:165:16: note: long int std::abs(long int)
>  inline long   abs(long _l) { return labs(_l); }
>                ^
>/usr/include/iso/stdlib_iso.h:119:12: note: int std::abs(int)
> extern int abs(int);
>            ^

there is no error specifying -m64.

Also, copying tabs.cc to tabs.c and building with gcc gives no error either
('gcc -m32 -c tabs.c' or to be pedantic with -std=c99 added).

I should mention that this seems to work okay with gcc4.4.4, but reproducible
with the compilers accessible, namely gcc47..gcc49.

The test program seems to work fine on NetBSD and FreeBSD.

This platform is SunOS 5.11 (illumos).