@node ax_cflags_force_c89
@unnumberedsec ax_cflags_force_c89

@majorheading Synopsis

@smallexample
AX_CFLAGS_FORCE_C89 [(shellvar [,default, [A/NA]])]
@end smallexample

@majorheading Description

Try to find a compiler option that enables strict C89 mode.

For the GNU CC compiler it will be -ansi -pedantic.  The result is added
to the shellvar being CFLAGS by default.

Currently this macro knows about GCC, Solaris C compiler, Digital Unix C
compiler, C for AIX Compiler, HP-UX C compiler, IRIX C compiler, NEC
SX-5 (Super-UX 10) C compiler, and Cray J90 (Unicos 10.0.0.8) C
compiler.

@smallexample
 - $1 shell-variable-to-add-to : CFLAGS
 - $2 add-value-if-not-found : nothing
 - $3 action-if-found : add value to shellvariable
 - $4 action-if-not-found : nothing
@end smallexample

NOTE: These macros depend on AX_APPEND_FLAG.

@majorheading Source Code

Download the
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_cflags_force_c89.m4,latest
version of @file{ax_cflags_force_c89.m4}} or browse
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=history;f=m4/ax_cflags_force_c89.m4,the
macro's revision history}.

@majorheading License

@w{Copyright @copyright{} 2009 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.