Bug#261513: gcc-3.3: strtof only in c99 but not undefined reference otherwise

[MASSONIE Dominique <dominique.massonie@lia.univ-avignon.fr>]

Package: gcc-3.3
Version: 1:3.3.4-5
Severity: normal



-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.4.24+d1
Locale: LANG=C, LC_CTYPE=C

Versions of packages gcc-3.3 depends on:
ii  binutils                   2.14.90.0.7-8 The GNU assembler, linker and bina
ii  cpp-3.3                    1:3.3.4-5     The GNU C preprocessor
ii  gcc-3.3-base               1:3.3.4-5     The GNU Compiler Collection (base 
ii  libc6                      2.3.2.ds1-13  GNU C Library: Shared libraries an
ii  libgcc1                    1:3.4.1-3     GCC support library

-- no debconf information

/*
  The following sample code uses function "strtof".
  Compiled without -std=c99 it produces some bad results instead of a
  compilation error (IMHO: undefined reference to `strtof')
*/

#include <stdlib.h> /* needed for strtod and strtof */
#include <stdio.h>  /* needed for fprintf */

// some related information:
//  - man strtod, strtof, strtold:
//    CONFORMING TO
//       ANSI C describes strtod, C99 describes the other two functions.
//
//  - in /usr/include/stdlib.h
//
// #ifdef  __USE_ISOC99
// __BEGIN_NAMESPACE_C99
// ...
// extern float strtof (__const char *__restrict __nptr,
//                      char **__restrict __endptr) __THROW;
// ...
// __END_NAMESPACE_C99
// #endif

int main (void)
{
    const char buf[] = "123.45";

    fprintf (stdout, "result %f == %f and 6 == %d\n",
	     (float)strtod (buf, NULL),
	     strtof (buf, NULL),
	     6);
    exit (0);
}

// ok with:  gcc -Wall -std=c99 test_strtof.c
//
// without -std=c99 should get (IMHO):
//: undefined reference to `strtof'
// but instead get broken output like:
// result 123.449997 == 0.000000 and 6 == 1073970383