# =========================================================================== # 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 # #endif /* HAVE_PCRE2 */ # # LICENSE # # Copyright (c) 2020 Robert van Engelen # # 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 . # # 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 ])