dnl Check for PCRE Libraries
dnl CHECK_PCRE(ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
dnl Sets:
dnl  PCRE_CFLAGS
dnl  PCRE_LIBS

PCRE_CONFIG=""
PCRE_VERSION=""
PCRE_CPPFLAGS=""
PCRE_CFLAGS=""
PCRE_LDFLAGS=""
PCRE_LDADD=""
PCRE_LD_PATH=""

AC_DEFUN([CHECK_PCRE],
[dnl

AC_ARG_WITH(
    pcre,
    [AC_HELP_STRING([--with-pcre=PATH],[Path to pcre prefix or config script])],
    [test_paths="${with_pcre}"],
    [test_paths="/usr/local/libpcre /usr/local/pcre /usr/local /opt/libpcre /opt/pcre /opt /usr /opt/local"])

AC_MSG_CHECKING([for libpcre config script])

for x in ${test_paths}; do
    dnl # Determine if the script was specified and use it directly
    if test ! -d "$x" -a -e "$x"; then
        PCRE_CONFIG=$x
        pcre_path="no"
        break
    fi

    dnl # Try known config script names/locations
    for PCRE_CONFIG in pcre-config; do
        if test -e "${x}/bin/${PCRE_CONFIG}"; then
            pcre_path="${x}/bin"
            break
        elif test -e "${x}/${PCRE_CONFIG}"; then
            pcre_path="${x}"
            break
        else
            pcre_path=""
        fi
    done
    if test -n "$pcre_path"; then
        break
    fi
done

if test -n "${pcre_path}"; then
    if test "${pcre_path}" != "no"; then
        PCRE_CONFIG="${pcre_path}/${PCRE_CONFIG}"
    fi
    AC_MSG_RESULT([${PCRE_CONFIG}])
    PCRE_VERSION="`${PCRE_CONFIG} --version`"
    if test ! -z "${PCRE_VERSION}"; then AC_MSG_NOTICE(pcre VERSION: $PCRE_VERSION); fi
    PCRE_CFLAGS="`${PCRE_CONFIG} --cflags`"
    if test ! -z "${PCRE_CFLAGS}"; then AC_MSG_NOTICE(pcre CFLAGS: $PCRE_CFLAGS); fi
    PCRE_LDADD="`${PCRE_CONFIG} --libs`"
    if test ! -z "${PCRE_LDADD}"; then AC_MSG_NOTICE(pcre LDADD: $PCRE_LDADD); fi
    PCRE_LD_PATH="/`${PCRE_CONFIG} --libs | cut -d'/' -f2,3,4,5,6 | cut -d ' ' -f1`"
    if test ! -z "${PCRE_LD_PATH}"; then AC_MSG_NOTICE(pcre PCRE_LD_PATH: $PCRE_LD_PATH); fi
else
    AC_MSG_RESULT([no])
fi

if test -n "${PCRE_VERSION}"; then
    AC_MSG_CHECKING(for PCRE JIT)
    save_CFLAGS=$CFLAGS
    save_LDFLAGS=$LDFLAGS
    save_LIBS=$LIBS
    CFLAGS="${PCRE_CFLAGS} ${CFLAGS}"
    LDFLAGS="${PCRE_LDADD} ${LDFLAGS}"
    LIBS="${PCRE_LDADD} ${LIBS}"
    AC_TRY_LINK([ #include <pcre.h> ],
        [ pcre_jit_exec(NULL, NULL, NULL, 0, 0, 0, NULL, 0, NULL); ],
        [ pcre_jit_available=yes ], [:]
    )

    if test "x$pcre_jit_available" = "xyes"; then
        AC_MSG_RESULT(yes)
        PCRE_CFLAGS="${PCRE_CFLAGS} -DPCRE_HAVE_JIT"
    else
        AC_MSG_RESULT(no)
    fi
    CFLAGS=$save_CFLAGS
    LDFLAGS=$save_LDFLAGS
    LIBS=$save_LIBS
fi

AC_SUBST(PCRE_CONFIG)
AC_SUBST(PCRE_VERSION)
AC_SUBST(PCRE_CPPFLAGS)
AC_SUBST(PCRE_CFLAGS)
AC_SUBST(PCRE_LDFLAGS)
AC_SUBST(PCRE_LDADD)
AC_SUBST(PCRE_LD_PATH)

if test -z "${PCRE_VERSION}"; then
    AC_MSG_NOTICE([*** pcre library not found.])
    ifelse([$2], , AC_MSG_ERROR([pcre library is required]), $2)
else
    AC_MSG_NOTICE([using pcre v${PCRE_VERSION}])
    ifelse([$1], , , $1) 
    PCRE_LDADD="${PCRE_LDADD} -lpcre"
fi 
])
