Jonathan Wakely wrote:
On 22 July 2013 17:22, Patrick Begou wrote:
Ian Lance Taylor wrote:
Using optimization changes how your library header files behave. Look
for #ifdef __OPTIMIZE__ or defined(__OPTIMIZE__). This looks like a
problem with your C library, not with GCC proper.
Ian
In http://gfortran.com/download/x86_64/PLEASE_README.txt the requirement for
glibc is :
"... The provided compilers need glibc 2.4 or newer, however the library
libgomp needs glibc 2.6...."
I am runing glibc-devel-2.11.3-12.59.1.x86_64
so my glibc level seams correct no ?
Yes, but Ian didn't say your glibc is too old. Try looking for
__OPTIMIZE__ and figuring out why you get different declarations with
optimization enabled.
When optimization is enabled, the compiler uses an additional file:
/usr/include/bits/stdio.h included from /usr/include/stdio.h. The problem raised
from this file. /usr/include/stdio.h contains:
.....
/* If we are compiling with optimizing read this file. It contains
several optimizing inline functions and macros. */
#ifdef __USE_EXTERN_INLINES
# include <bits/stdio.h>
#endif
....
but no __OPTIMIZE__ directives.
That looks strange for me is:
1) g++ 4.8 shows the problem with glibc-devel-2.10.1-10.9.1.x86_64 and with
glibc-devel-2.11.3-12.59.1.x86_64 on two different hosts.
2) On these hosts, compilation at -O2 and -O3 level is successful with :
- gcc33-c++-3.3.3-15.3.x86_64,
- gcc44-c++-4.4.1_20090817-2.3.4.x86_64
- gcc-c++-4.5-19.1.x86_64,
- gcc46-c++-4.6.3_20120531-105.1.x86_64
So I'm not sure that it is related to a bogus glibc....
I've attached the small C++ code generated by the configure step of openmpi.
Patrick
--
===================================================================
| Equipe M.O.S.T. | |
| Patrick BEGOU | mailto:Patrick.Begou@xxxxxxxxxxxxxxx |
| LEGI | |
| BP 53 X | Tel 04 76 82 51 35 |
| 38041 GRENOBLE CEDEX | Fax 04 76 82 52 71 |
===================================================================
#include <stdio.h>
#include <stdlib.h>
static long int longval () { return (long int) (sizeof (bool)); }
static unsigned long int ulongval () { return (long int) (sizeof (bool)); }
int
main ()
{
FILE *f = fopen ("conftest.val", "w");
if (! f)
return 1;
if (((long int) (sizeof (bool))) < 0)
{
long int i = longval ();
if (i != ((long int) (sizeof (bool))))
return 1;
fprintf (f, "%ld", i);
}
else
{
unsigned long int i = ulongval ();
if (i != ((long int) (sizeof (bool))))
return 1;
fprintf (f, "%lu", i);
}
/* Do not output a trailing newline, as this causes \r\n confusion
on some platforms. */
return ferror (f) || fclose (f) != 0;
;
return 0;
}
