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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_check_posix_regcomp.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_POSIX_REGCOMP
#
# DESCRIPTION
#
# Check that the POSIX compliant regular expression compiler is available
# in the POSIX specified manner, and it works. If it fails, we have a
# backup -- use gnu-regex.
#
# LICENSE
#
# Copyright (c) 2008 Bruce Korb <bkorb@gnu.org>
#
# 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 6
AU_ALIAS([AG_CHECK_POSIX_REGCOMP], [AX_CHECK_POSIX_REGCOMP])
AC_DEFUN([AX_CHECK_POSIX_REGCOMP],[
AC_MSG_CHECKING([whether POSIX compliant regcomp()/regexec()])
AC_CACHE_VAL([ax_cv_posix_regcomp],[
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <sys/types.h>
#include <regex.h>
int main() {
int flags = REG_EXTENDED|REG_ICASE|REG_NEWLINE;
regex_t re;
if (regcomp( &re, "^.*$", flags ) != 0)
return 1;
return regcomp( &re, "yes.*|no.*", flags );
}
]])], [ax_cv_posix_regcomp=yes],[ax_cv_posix_regcomp=no],[ax_cv_posix_regcomp=no])
])
AC_MSG_RESULT([$ax_cv_posix_regcomp])
if test "$ax_cv_posix_regcomp" = "yes"; then
AC_DEFINE(HAVE_POSIX_REGCOMP, 1,
[Define this if POSIX compliant regcomp()/regexec()])
fi
]) # end of AC_DEFUN of AX_CHECK_POSIX_REGCOMP
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