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