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c431ba904c
This used to add -L/lib to LDFLAGS which was not an issue unless you are cross compiling and then it may detect PCRE features based on the host PCRE not the target one.
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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