File: ax_check_preproc_flag.texi

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@node ax_check_preproc_flag
@unnumberedsec ax_check_preproc_flag

@majorheading Synopsis

@smallexample
AX_CHECK_PREPROC_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
@end smallexample

@majorheading Description

Check whether the given FLAG works with the current language's
preprocessor or gives an error.  (Warnings, however, are ignored)

ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
success/failure.

If EXTRA-FLAGS is defined, it is added to the preprocessor's default
flags when the check is done.  The check is thus made with the flags:
"CPPFLAGS EXTRA-FLAGS FLAG".  This can for example be used to force the
preprocessor to issue an error when a bad flag is given.

INPUT gives an alternative input source to AC_PREPROC_IFELSE.

NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
macro in sync with AX_CHECK_@{COMPILE,LINK@}_FLAG.

@majorheading Source Code

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

@majorheading License

@w{Copyright @copyright{} 2008 Guido U. Draheim @email{guidod@@gmx.de}} @* @w{Copyright @copyright{} 2011 Maarten Bosmans @email{mkbosmans@@gmail.com}}

This program is free software: you can redistribute it and/or modify it
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