@node ax_cflags_aix_option
@unnumberedsec ax_cflags_aix_option

@majorheading Synopsis

@smallexample
AX_CFLAGS_AIX_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
@end smallexample

@majorheading Description

AX_CFLAGS_AIX_OPTION(-qubicle) would show a message as like "checking
CFLAGS for aix/cc -qubicle ... yes" and adds the optionflag to CFLAGS if
it is understood. You can override the shellvar-default of CFLAGS of
course. The order of arguments stems from the explicit macros like
AX_CFLAGS_WARN_ALL.

The cousin AX_CXXFLAGS_AIX_OPTION would check for an option to add to
CXXFLAGS - and it uses the autoconf setup for C++ instead of C (since it
is possible to use different compilers for C and C++).

The macro is a lot simpler than any special AX_CFLAGS_* macro (or
ax_cxx_rtti.m4 macro) but allows to check for arbitrary options.
However, if you use this macro in a few places, it would be great if you
would make up a new function-macro and submit it to the ac-archive.

@smallexample
 - $1 option-to-check-for : required ("-option" as non-value)
 - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case)
 - $3 action-if-found : add value to shellvariable
 - $4 action-if-not-found : nothing
@end smallexample

note: in earlier versions, $1-$2 were swapped. We try to detect the
situation and accept a $2=~/-/ as being the old option-to-check-for.

see also: AX_CFLAGS_GCC_OPTION for the widely used original variant.

@majorheading Source Code

Download the
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_cflags_aix_option.m4,latest
version of @file{ax_cflags_aix_option.m4}} or browse
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=history;f=m4/ax_cflags_aix_option.m4,the
macro's revision history}.

@majorheading License

@w{Copyright @copyright{} 2008 Guido U. Draheim @email{guidod@@gmx.de}}

Copying and distribution of this file, with or without modification, are
permitted in any medium without royalty provided the copyright notice
and this notice are preserved.  This file is offered as-is, without any
warranty.