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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cflags_force_c89.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CFLAGS_FORCE_C89 [(shellvar [,default, [A/NA]])]
#
# 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.
#
# - $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
#
# NOTE: These macros depend on AX_APPEND_FLAG.
#
# LICENSE
#
# Copyright (c) 2009 Guido U. Draheim <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.
#serial 12
AC_DEFUN([AX_CFLAGS_FORCE_C89],[dnl
AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_force_c89])dnl
AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for C89 mode],
VAR,[VAR="no, unknown"
AC_LANG_PUSH([C])
ac_save_[]FLAGS="$[]FLAGS"
for ac_arg dnl
in "-pedantic % -ansi -pedantic" dnl GCC
"-xstrconst % -v -Xc" dnl Solaris C
"-std1 % -std1" dnl Digital Unix
" % -qlanglvl=ansi" dnl AIX
" % -ansi -ansiE" dnl IRIX
"+ESlit % -Aa" dnl HP-UX C
"-Xc % -Xc" dnl NEC SX-5 (Super-UX 10)
"-h conform % -h conform" dnl Cray C (Unicos)
#
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
[[return 0;]])],
[VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break],[])
done
FLAGS="$ac_save_[]FLAGS"
AC_LANG_POP([C])
])
AS_VAR_POPDEF([FLAGS])dnl
AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
case ".$VAR" in
.ok|.ok,*) m4_ifvaln($3,$3) ;;
.|.no|.no,*) m4_default($4,[m4_ifval($2,[AX_APPEND_FLAG([$2], [$1])])]) ;;
*) m4_default($3,[AX_APPEND_FLAG([$VAR], [$1])]) ;;
esac
AS_VAR_POPDEF([VAR])dnl
])
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