AC_CHECK_FUNCS always succeeds on AIX with Autoconf 2.56

[Martin Frydl]

Hello,

  I've put AC_CHECK_FUNCS(stricmp) to configure.in and it always 
succeeds on AIX with both IBM compiler and gcc. The test looks something 
like this:

char strncasecmp ();
char (*f) () = strncasecmp;

int main () {
  return 0;
}

  When this is compiled and linked, no error is reported. But when test 
from Autoconf 2.52 is used, everything works (i.e. reports error since 
stricmp is not available):

char stricmp ();
char (*f) ();

int main () {
  f = stricmp;
  return 0;
}

  It looks like the first test is somehow "optimized" by compiler and 
thus is linkable. What about putting back the original test? Why was it 
changed?

  My configuration:
    AIX 4.3.3
    IBM C/C++ 3.6.6
    gcc 3.1.1

  Thanks
    Martin Frydl