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Diffstat (limited to 'm4/ax_check_pcre2.m4')
| -rw-r--r-- | m4/ax_check_pcre2.m4 | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/m4/ax_check_pcre2.m4 b/m4/ax_check_pcre2.m4 new file mode 100644 index 0000000..9ae01ad --- /dev/null +++ b/m4/ax_check_pcre2.m4 @@ -0,0 +1,163 @@ +# =========================================================================== +# https://www.gnu.org/software/autoconf-archive/ax_check_pcre2.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_CHECK_PCRE2([bits], [action-if-found], [action-if-not-found]) +# +# DESCRIPTION +# +# Search for an installed libpcre2-8 library. If nothing was specified +# when calling configure, it searches first in /usr/local and then in +# /usr, /opt/local and /sw. If the --with-pcre2=DIR is specified, it will +# try to find it in DIR/include/pcre2.h and DIR/lib/libpcre2-8. If +# --without-pcre2 is specified, the library is not searched at all. +# +# If 'bits' is empty or '8', PCRE2 8-bit character support is checked +# only. If 'bits' contains '16', PCRE2 8-bit and 16-bit character support +# are checked. If 'bits' contains '32', PCRE2 8-bit and 32-bit character +# support are checked. When 'bits' contains both '16' and '32', PCRE2 +# 8-bit, 16-bit, and 32-bit character support is checked. +# +# If either the header file (pcre2.h), or the library (libpcre2-8) is not +# found, or the specified PCRE2 character bit width is not supported, +# shell commands 'action-if-not-found' is run. If 'action-if-not-found' is +# not specified, the configuration exits on error, asking for a valid +# PCRE2 installation directory or --without-pcre2. +# +# If both header file and library are found, and the specified PCRE2 bit +# widths are supported, shell commands 'action-if-found' is run. If +# 'action-if-found' is not specified, the default action appends +# '-I${PCRE2_HOME}/include' to CPFLAGS, appends '-L$PCRE2_HOME}/lib' to +# LDFLAGS, prepends '-lpcre2-8' to LIBS, and calls AC_DEFINE(HAVE_PCRE2). +# You should use autoheader to include a definition for this symbol in a +# config.h file. Sample usage in a C/C++ source is as follows: +# +# #ifdef HAVE_PCRE2 +# #define PCRE2_CODE_UNIT_WIDTH 8 +# #include <pcre2.h> +# #endif /* HAVE_PCRE2 */ +# +# LICENSE +# +# Copyright (c) 2020 Robert van Engelen <engelen@acm.org> +# +# This program is free software; you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by the +# Free Software Foundation; either version 2 of the License, or (at your +# option) any later version. +# +# This program is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General +# Public License for more details. +# +# You should have received a copy of the GNU General Public License along +# with this program. If not, see <https://www.gnu.org/licenses/>. +# +# As a special exception, the respective Autoconf Macro's copyright owner +# gives unlimited permission to copy, distribute and modify the configure +# scripts that are the output of Autoconf when processing the Macro. You +# need not follow the terms of the GNU General Public License when using +# or distributing such scripts, even though portions of the text of the +# Macro appear in them. The GNU General Public License (GPL) does govern +# all other use of the material that constitutes the Autoconf Macro. +# +# This special exception to the GPL applies to versions of the Autoconf +# Macro released by the Autoconf Archive. When you make and distribute a +# modified version of the Autoconf Macro, you may extend this special +# exception to the GPL to apply to your modified version as well. + +#serial 2 + +AC_DEFUN([AX_CHECK_PCRE2], +# +# Handle user hints +# +[AC_MSG_CHECKING(if PCRE2 is wanted) +pcre2_places="/usr/local /usr /opt/local /sw" +AC_ARG_WITH([pcre2], +[ --with-pcre2=DIR root directory path of PCRE2 installation @<:@defaults to + /usr/local or /usr if not found in /usr/local@:>@ + --without-pcre2 to disable PCRE2 usage completely], +[if test "$withval" != "no" ; then + AC_MSG_RESULT(yes) + if test -d "$withval" + then + pcre2_places="$withval $pcre2_places" + else + AC_MSG_WARN([Sorry, $withval does not exist, checking usual places]) + fi +else + pcre2_places="" + AC_MSG_RESULT(no) +fi], +[AC_MSG_RESULT(yes)]) +# +# Locate PCRE2, if wanted +# +if test -n "${pcre2_places}" +then + # check the user supplied or any other more or less 'standard' place: + # Most UNIX systems : /usr/local and /usr + # MacPorts / Fink on OSX : /opt/local respectively /sw + for PCRE2_HOME in ${pcre2_places} ; do + if test -f "${PCRE2_HOME}/include/pcre2.h"; then break; fi + PCRE2_HOME="" + done + + PCRE2_OLD_LDFLAGS=$LDFLAGS + PCRE2_OLD_CPPFLAGS=$CPPFLAGS + if test -n "${PCRE2_HOME}"; then + LDFLAGS="$LDFLAGS -L${PCRE2_HOME}/lib" + CPPFLAGS="$CPPFLAGS -I${PCRE2_HOME}/include" + fi + AC_LANG_PUSH([C]) + AC_CHECK_LIB([pcre2-8], [pcre2_compile_8], [pcre2_cv_libpcre2=yes], [pcre2_cv_libpcre2=no]) + AC_CHECK_HEADER([pcre2.h], [pcre2_cv_pcre2_h=yes], [pcre2_cv_pcre2_h=no], [#define PCRE2_CODE_UNIT_WIDTH 8]) + case "$1" in + *16*) + AC_CHECK_LIB([pcre2-16], [pcre2_compile_16], [pcre2_cv_libpcre2_16=yes], [pcre2_cv_libpcre2_16=no]) + AC_CHECK_HEADER([pcre2.h], [pcre2_cv_pcre2_16_h=yes], [pcre2_cv_pcre2_16_h=no], [#define PCRE2_CODE_UNIT_WIDTH 16]) + if test "$pcre2_cv_libpcre2_16" = "no" || test "$pcre2_cv_pcre2_16_h" = "no"; then + pcre2_cv_libpcre2=no + fi + ;; + esac + case "$1" in + *32*) + AC_CHECK_LIB([pcre2-32], [pcre2_compile_32], [pcre2_cv_libpcre2_32=yes], [pcre2_cv_libpcre2_32=no]) + AC_CHECK_HEADER([pcre2.h], [pcre2_cv_pcre2_32_h=yes], [pcre2_cv_pcre2_32_h=no], [#define PCRE2_CODE_UNIT_WIDTH 32]) + if test "$pcre2_cv_libpcre2_32" = "no" || test "$pcre2_cv_pcre2_32_h" = "no"; then + pcre2_cv_libpcre2=no + fi + esac + AC_LANG_POP([C]) + if test "$pcre2_cv_libpcre2" = "yes" && test "$pcre2_cv_pcre2_h" = "yes" + then + # + # If both library and header were found, action-if-found + # + m4_ifblank([$2],[ + CPPFLAGS="$CPPFLAGS -I${PCRE2_HOME}/include" + LDFLAGS="$LDFLAGS -L${PCRE2_HOME}/lib" + LIBS="-lpcre2-8 $LIBS" + AC_DEFINE([HAVE_PCRE2], [1], + [Define to 1 if you have `PCRE2' library (-lpcre2-$1)]) + ],[ + # Restore variables + LDFLAGS="$PCRE2_OLD_LDFLAGS" + CPPFLAGS="$PCRE2_OLD_CPPFLAGS" + $2 + ]) + else + # + # If either header or library was not found, action-if-not-found + # + m4_default([$3],[ + AC_MSG_ERROR([either specify a valid PCRE2 installation with --with-pcre2=DIR or disable PCRE2 usage with --without-pcre2]) + ]) + fi +fi +]) |