checking Mac OS X headers

[Vincent Torri]

Hey,

I restart this thread.

So, what I would like to do is checking Mac OS X headers in an m4 macro. 
If the objective C compiler is installed, no problem. If it is not, i 
would like that, in the m4 macro, the test not to be done.

I have attached a complete, and I think, minimal example

In configure.ac, I call conditionnaly AC_PROG_OBJC.

Before using AC_CHECK_HEADER in check.m4, I have to call 
AC_LANG_PUSH([Objective C]). It is that macro that is the problem:

1) Without it and on a system without an obj c compiler, no problem.
2) Without it and on a system with an obj c compiler, there is an error.

3) With it and on a system without an obj c compiler there is an error
4) With it and on a system with an obj c compiler, no problem

as there is a failure in point 2), I must use AC_LANG_PUSH([Objective C])

What must I do, in check.m4, to disable the check of those headers, so 
that there is no problem with AC_LANG_PUSH([Objective C]) (point 3) ) ?

thank you

Vincent Torri

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