_AC_PROG_CXX_EXIT_DECLARATION oddity

[Daniel Elstner]

Hello,

Why does _AC_PROG_CXX_EXIT_DECLARATION try '#include <stdlib.h>' first,
before the trying the prototypes?

Here's the ChangeLog entry:

2001-01-22  Lars J. Aas  <address@hidden>
    * aclang.m4 (_AC_PROG_CXX_EXIT_DECLARATION): First try no declaration,
      then '#include <stdlib.h>', before trying the explicit declarations.

Is there any chance left that the explicit declaration will be used?
I ask that because it breaks my configure script. There's e.g. a check
for select(), which has its prototype included by <stdlib.h> on my
system. Of course this fails when checking for select with the C++
compiler.

You may say I should use the C compiler for this test, but since I use
this function in C++ code I should check it with the C++ compiler, too.
IMHO.

Anyway, what's the sense of that behaviour?

Any advice would be greatly appreciated,
--Daniel