Source of libcurl.m4 - Zabbix

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#
# For the sake of sanity, this macro assumes that any libcurl that is
# found is after version 7.7.2, the first version that included the
# curl-config script.  Note that it is very important for people
# packaging binary versions of libcurl to include this script!
# Without curl-config, we can only guess what protocols are available,
# or use curl_version_info to figure it out at runtime.
​
AC_DEFUN([LIBCURL_CHECK_CONFIG],
[
  AH_TEMPLATE([LIBCURL_FEATURE_SSL],[Defined if libcurl supports SSL])
  AH_TEMPLATE([LIBCURL_FEATURE_KRB4],[Defined if libcurl supports KRB4])
  AH_TEMPLATE([LIBCURL_FEATURE_IPV6],[Defined if libcurl supports IPv6])
  AH_TEMPLATE([LIBCURL_FEATURE_LIBZ],[Defined if libcurl supports libz])
  AH_TEMPLATE([LIBCURL_FEATURE_ASYNCHDNS],[Defined if libcurl supports AsynchDNS])
  AH_TEMPLATE([LIBCURL_FEATURE_IDN],[Defined if libcurl supports IDN])
  AH_TEMPLATE([LIBCURL_FEATURE_SSPI],[Defined if libcurl supports SSPI])
  AH_TEMPLATE([LIBCURL_FEATURE_NTLM],[Defined if libcurl supports NTLM])
​
  AH_TEMPLATE([LIBCURL_PROTOCOL_HTTP],[Defined if libcurl supports HTTP])
  AH_TEMPLATE([LIBCURL_PROTOCOL_HTTPS],[Defined if libcurl supports HTTPS])
  AH_TEMPLATE([LIBCURL_PROTOCOL_FTP],[Defined if libcurl supports FTP])
  AH_TEMPLATE([LIBCURL_PROTOCOL_FTPS],[Defined if libcurl supports FTPS])
  AH_TEMPLATE([LIBCURL_PROTOCOL_FILE],[Defined if libcurl supports FILE])
  AH_TEMPLATE([LIBCURL_PROTOCOL_TELNET],[Defined if libcurl supports TELNET])
  AH_TEMPLATE([LIBCURL_PROTOCOL_LDAP],[Defined if libcurl supports LDAP])
  AH_TEMPLATE([LIBCURL_PROTOCOL_DICT],[Defined if libcurl supports DICT])
  AH_TEMPLATE([LIBCURL_PROTOCOL_TFTP],[Defined if libcurl supports TFTP])
​
  _libcurl_config="no"
​
  AC_ARG_WITH(libcurl,
     [
If you want to use cURL library:
AS_HELP_STRING([--with-libcurl@<:@=DIR@:>@],[use cURL package @<:@default=no@:>@, optionally specify path to curl-config])],
        [
        if test "x$withval" = "xno"; then
            want_curl="no"
        elif test "x$withval" = "xyes"; then
Show more
                    # This is so silly, but Apple actually has a bug in their
                    # curl-config script.  Fixed in Tiger, but there are still
                    # lots of Panther installs around.
                    case "${host}" in
                        powerpc-apple-darwin7*)
                            LIBCURL_LIBS=`echo $LIBCURL_LIBS | sed -e 's|-arch i386||g'`
                        ;;
                    esac
                fi # "x$LIBCURL_LIBS" = "x"
​
                # All curl-config scripts support --feature
                _libcurl_features=`$_libcurl_config --feature`
​
                # Is it modern enough to have --protocols? (7.12.4)
                if test $_libcurl_version -ge 461828; then
                    _libcurl_protocols=`$_libcurl_config --protocols`
                fi
​
                _libcurl_try_link=yes
            fi # $_libcurl_wanted -eq 0 || "x$libcurl_cv_lib_version_ok" = "xyes"
​
            unset _libcurl_wanted
        fi # -x "$_libcurl_config"
​
        if test "x$_libcurl_try_link" = "xyes"; then
            # we didn't find curl-config, so let's see if the user-supplied
            # link line (or failing that, "-lcurl") is enough.
​
Show more
            ])
​
            if test "x$libcurl_cv_lib_curl_usable" = "xno"; then
                link_mode="dynamic"
                if test "x$enable_static" = "xyes"; then
                    link_mode="static"
                fi
                AC_MSG_ERROR([libcurl is not available for ${link_mode} linking])
            fi
​
            # Does curl_free() exist in this version of libcurl?
            # If not, fake it with free()
​
            _save_curl_libs="${LIBS}"
            _save_curl_ldflags="${LDFLAGS}"
            _save_curl_cflags="${CFLAGS}"
            LIBS="${LIBS} ${LIBCURL_LIBS}"
            LDFLAGS="${LDFLAGS} ${LIBCURL_LDFLAGS}"
            CFLAGS="${CFLAGS} ${LIBCURL_CFLAGS}"
​
            AC_CHECK_FUNC(curl_free,,
                AC_DEFINE(curl_free,free,
                    [Define curl_free() as free() if our version of curl lacks curl_free.]))
​
            AC_CHECK_FUNC(curl_easy_escape,
                AC_DEFINE(HAVE_FUNCTION_CURL_EASY_ESCAPE,1,
                    [Define to 1 if function 'curl_easy_escape' exists.]))
​
            LIBS="${_save_curl_libs}"
            LDFLAGS="${_save_curl_ldflags}"
            CFLAGS="${_save_curl_cflags}"
            unset _save_curl_libs
            unset _save_curl_ldflags
            unset _save_curl_cflags
​
            AC_DEFINE(HAVE_LIBCURL,1,
                [Define to 1 if you have a functional curl library.])
            AC_SUBST(LIBCURL_CFLAGS)
            AC_SUBST(LIBCURL_LDFLAGS)
            AC_SUBST(LIBCURL_LIBS)
            found_curl="yes"
​
            for _libcurl_feature in $_libcurl_features ; do
                AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_feature_$_libcurl_feature),[1])
                eval AS_TR_SH(libcurl_feature_$_libcurl_feature)=yes
            done
​
            if test "x$_libcurl_protocols" = "x"; then
                # We don't have --protocols, so just assume that all
                # protocols are available
                _libcurl_protocols="HTTP FTP FILE TELNET LDAP DICT"
​
                if test "x$libcurl_feature_SSL" = "xyes"; then
                    _libcurl_protocols="$_libcurl_protocols HTTPS"
​
                    # FTPS wasn't standards-compliant until version
                    # 7.11.0
                    if test $_libcurl_version -ge 461568; then
                        _libcurl_protocols="$_libcurl_protocols FTPS"
                    fi
                fi
            fi
​
            for _libcurl_protocol in $_libcurl_protocols ; do
                AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_protocol_$_libcurl_protocol),[1])
                eval AS_TR_SH(libcurl_protocol_$_libcurl_protocol)=yes
            done
        else
            unset LIBCURL_LIBS
            unset LIBCURL_CFLAGS
        fi # "x$_libcurl_try_link" = "xyes"
​
        unset _libcurl_try_link
        unset _libcurl_version_parse
        unset _libcurl_config
        unset _libcurl_feature
        unset _libcurl_features
        unset _libcurl_protocol
        unset _libcurl_protocols
        unset _libcurl_version
        unset _libcurl_libs
    fi # "x$want_curl" != "xno"
​
  if test "x$want_curl" = "xno" || test "x$libcurl_cv_lib_curl_usable" != "xyes"; then
     # This is the IF-NO path
     ifelse([$4],,:,[$4])
  else
     # This is the IF-YES path
     ifelse([$3],,:,[$3])