| 1 | # pcre.m4 - check for libpcre support
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| 2 |
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| 3 | # Copyright (C) 2010-2021 Free Software Foundation, Inc.
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| 4 | # This file is free software; the Free Software Foundation
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| 5 | # gives unlimited permission to copy and/or distribute it,
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| 6 | # with or without modifications, as long as this notice is preserved.
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| 7 |
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| 8 | AC_DEFUN([gl_FUNC_PCRE],
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| 9 | [
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| 10 | AC_ARG_ENABLE([perl-regexp],
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| 11 | AS_HELP_STRING([--disable-perl-regexp],
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| 12 | [disable perl-regexp (pcre) support]),
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| 13 | [case $enableval in
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| 14 | yes|no) test_pcre=$enableval;;
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| 15 | *) AC_MSG_ERROR([invalid value $enableval for --disable-perl-regexp]);;
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| 16 | esac],
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| 17 | [test_pcre=maybe])
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| 18 |
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| 19 | AC_SUBST([PCRE_CFLAGS])
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| 20 | AC_SUBST([PCRE_LIBS])
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| 21 | use_pcre=no
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| 22 |
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| 23 | if test $test_pcre != no; then
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| 24 | PKG_CHECK_MODULES([PCRE], [libpcre], [], [: ${PCRE_LIBS=-lpcre}])
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| 25 |
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| 26 | AC_CACHE_CHECK([for pcre_compile], [pcre_cv_have_pcre_compile],
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| 27 | [pcre_saved_CFLAGS=$CFLAGS
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| 28 | pcre_saved_LIBS=$LIBS
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| 29 | CFLAGS="$CFLAGS $PCRE_CFLAGS"
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| 30 | LIBS="$PCRE_LIBS $LIBS"
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| 31 | AC_LINK_IFELSE(
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| 32 | [AC_LANG_PROGRAM([[#include <pcre.h>
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| 33 | ]],
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| 34 | [[pcre *p = pcre_compile (0, 0, 0, 0, 0);
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| 35 | return !p;]])],
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| 36 | [pcre_cv_have_pcre_compile=yes],
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| 37 | [pcre_cv_have_pcre_compile=no])
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| 38 | CFLAGS=$pcre_saved_CFLAGS
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| 39 | LIBS=$pcre_saved_LIBS])
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| 40 |
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| 41 | if test "$pcre_cv_have_pcre_compile" = yes; then
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| 42 | use_pcre=yes
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| 43 | elif test $test_pcre = maybe; then
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| 44 | AC_MSG_WARN([AC_PACKAGE_NAME will be built without pcre support.])
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| 45 | else
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| 46 | AC_MSG_ERROR([pcre support not available])
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| 47 | fi
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| 48 | fi
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| 49 |
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| 50 | if test $use_pcre = yes; then
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| 51 | AC_DEFINE([HAVE_LIBPCRE], [1],
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| 52 | [Define to 1 if you have the Perl Compatible Regular Expressions
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| 53 | library (-lpcre).])
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| 54 | else
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| 55 | PCRE_CFLAGS=
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| 56 | PCRE_LIBS=
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| 57 | fi
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| 58 | ])
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