Re: Problem with AC_CHECK_FUNCS() and new versions of g++

[Akim Demaille]

| #include <assert.h>
| /* Override any gcc2 internal prototype to avoid an error.  */
| #ifdef __cplusplus
| extern "C"
| #endif
| /* We use char because int might match the return type of a gcc2
|    builtin and then its argument prototype would still apply.  */
| char mkdir ();
| char (*f) ();

BTW, I never quite understood this comment.  Could someone explain it
to me?  Does gcc have functions which are `enabled' only when the
first prototype it sees is compatible?

| int
| main ()
| {
| /* The GNU C library defines this for functions which it implements
|     to always fail with ENOSYS.  Some functions are actually named
|     something starting with __ and the normal name is an alias.  */

I'd love details on this comment too, I don't understand it too well.
Am I understanding that if __stub_foo exists, it means that foo
doesn't really exist?

| #if defined (__stub_mkdir) || defined (__stub___mkdir)
| choke me
| #else
| f = mkdir;
| #endif
| 
|   ;
|   return 0;
| }
| 
| It works fine with gcc, but not g++.

I just tried with `2.95.2' and `2.97 20001101 (experimental)', and
both work properly.  Do you have additional flags?  What compiler
exactly are you using?