Re: Call the AC_CHECK_HEADER macro on a condition

[Julien ÉLIE]

Hi all,

> > - Second is to rewrite your condition using AS_IF, which automatically
> >    "hoists" the dependency AC_PROG_CPP (and any other dependencies)
> >    outside of the if condition.
>
> I just wanted to thank you for this explanation. I was not affected by
> the original issue, but your answer was very useful. Until now, I
> thought AS_IF() was just a stupid wrapper around the shell's if clause,
> but your answer makes it clear that it is a lot smarter than that.

So did I!

Incidentally, I am aware of AS_IF and AS_CASE constructions, as 
described in 
<https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Common-Shell-Constructs.html>.
Is it planned to add other macros like AS_FOR, AS_WHILE...?

One may consider doing something like:

for header in $LIST ; do AC_CHECK_HEADER([$header]) ; done

If I understand well, in case $LIST happens to be empty, AC_PROG_CPP 
will never be run, and subsequent calls to AC_CHECK_HEADER in the 
configure script will fail.

--
Julien ÉLIE

« Je sens que ma dernière hure est proche ! » (Astérix)