1# LIBCURL_CHECK_CONFIG ([DEFAULT-ACTION], [MINIMUM-VERSION],
2#                       [ACTION-IF-YES], [ACTION-IF-NO])
3# ----------------------------------------------------------
4#      David Shaw <dshaw@jabberwocky.com>   May-09-2006
5#
6# Checks for libcurl.  DEFAULT-ACTION is the string yes or no to
7# specify whether to default to --with-libcurl or --without-libcurl.
8# If not supplied, DEFAULT-ACTION is yes.  MINIMUM-VERSION is the
9# minimum version of libcurl to accept.  Pass the version as a regular
10# version number like 7.10.1. If not supplied, any version is
11# accepted.  ACTION-IF-YES is a list of shell commands to run if
12# libcurl was successfully found and passed the various tests.
13# ACTION-IF-NO is a list of shell commands that are run otherwise.
14# Note that using --without-libcurl does run ACTION-IF-NO.
15#
16# This macro #defines HAVE_LIBCURL if a working libcurl setup is
17# found, and sets @LIBCURL_LIBS@ and @LIBCURL_CFLAGS@ to the necessary
18# values.  Other useful defines are LIBCURL_FEATURE_xxx where xxx are
19# the various features supported by libcurl, and LIBCURL_PROTOCOL_yyy
20# where yyy are the various protocols supported by libcurl.  Both xxx
21# and yyy are capitalized.  See the list of AH_TEMPLATEs at the top of
22# the macro for the complete list of possible defines.  Shell
23# variables $libcurl_feature_xxx and $libcurl_protocol_yyy are also
24# defined to 'yes' for those features and protocols that were found.
25# Note that xxx and yyy keep the same capitalization as in the
26# curl-config list (e.g. it's "HTTP" and not "http").
27#
28# Users may override the detected values by doing something like:
29# LIBCURL_LIBS="-lcurl" LIBCURL_CFLAGS="-I/usr/myinclude" ./configure
30#
31# For the sake of sanity, this macro assumes that any libcurl that is
32# found is after version 7.7.2, the first version that included the
33# curl-config script.  Note that it is very important for people
34# packaging binary versions of libcurl to include this script!
35# Without curl-config, we can only guess what protocols are available,
36# or use curl_version_info to figure it out at runtime.
37
38AC_DEFUN([LIBCURL_CHECK_CONFIG],
39[
40  AH_TEMPLATE([LIBCURL_FEATURE_SSL],[Defined if libcurl supports SSL])
41  AH_TEMPLATE([LIBCURL_FEATURE_KRB4],[Defined if libcurl supports KRB4])
42  AH_TEMPLATE([LIBCURL_FEATURE_IPV6],[Defined if libcurl supports IPv6])
43  AH_TEMPLATE([LIBCURL_FEATURE_LIBZ],[Defined if libcurl supports libz])
44  AH_TEMPLATE([LIBCURL_FEATURE_ASYNCHDNS],[Defined if libcurl supports AsynchDNS])
45  AH_TEMPLATE([LIBCURL_FEATURE_IDN],[Defined if libcurl supports IDN])
46  AH_TEMPLATE([LIBCURL_FEATURE_SSPI],[Defined if libcurl supports SSPI])
47  AH_TEMPLATE([LIBCURL_FEATURE_NTLM],[Defined if libcurl supports NTLM])
48
49  AH_TEMPLATE([LIBCURL_PROTOCOL_HTTP],[Defined if libcurl supports HTTP])
50  AH_TEMPLATE([LIBCURL_PROTOCOL_HTTPS],[Defined if libcurl supports HTTPS])
51  AH_TEMPLATE([LIBCURL_PROTOCOL_FTP],[Defined if libcurl supports FTP])
52  AH_TEMPLATE([LIBCURL_PROTOCOL_FTPS],[Defined if libcurl supports FTPS])
53  AH_TEMPLATE([LIBCURL_PROTOCOL_FILE],[Defined if libcurl supports FILE])
54  AH_TEMPLATE([LIBCURL_PROTOCOL_TELNET],[Defined if libcurl supports TELNET])
55  AH_TEMPLATE([LIBCURL_PROTOCOL_LDAP],[Defined if libcurl supports LDAP])
56  AH_TEMPLATE([LIBCURL_PROTOCOL_DICT],[Defined if libcurl supports DICT])
57  AH_TEMPLATE([LIBCURL_PROTOCOL_TFTP],[Defined if libcurl supports TFTP])
58
59  _libcurl_config="no"
60
61  AC_ARG_WITH(libcurl,
62     [
63If you want to use cURL library:
64AC_HELP_STRING([--with-libcurl@<:@=DIR@:>@],[use cURL package @<:@default=no@:>@, optionally specify path to curl-config])],
65        [
66        if test "x$withval" = "xno"; then
67            want_curl="no"
68        elif test "x$withval" = "xyes"; then
69            want_curl="yes"
70        else
71            want_curl="yes"
72            _libcurl_config=$withval
73        fi
74        ],
75        [want_curl=ifelse([$1],,[no],[$1])])
76
77  if test "x$want_curl" != "xno"; then
78
79     AC_PROG_AWK
80
81     _libcurl_version_parse="eval $AWK '{split(\$NF,A,\".\"); X=256*256*A[[1]]+256*A[[2]]+A[[3]]; print X;}'"
82
83     _libcurl_try_link=no
84
85     AC_PATH_PROG([_libcurl_config], [curl-config], [])
86
87     if test -x "$_libcurl_config"; then
88        AC_CACHE_CHECK([for the version of libcurl],
89	   [libcurl_cv_lib_curl_version],
90           [libcurl_cv_lib_curl_version=`$_libcurl_config --version | $AWK '{print $[]2}'`])
91
92	_libcurl_version=`echo $libcurl_cv_lib_curl_version | $_libcurl_version_parse`
93	_libcurl_wanted=`echo ifelse([$2],,[0],[$2]) | $_libcurl_version_parse`
94
95        if test $_libcurl_wanted -gt 0; then
96	   AC_CACHE_CHECK([for libcurl >= version $2],
97	      [libcurl_cv_lib_version_ok],
98              [
99   	      if test $_libcurl_version -ge $_libcurl_wanted; then
100	         libcurl_cv_lib_version_ok=yes
101      	      else
102	         libcurl_cv_lib_version_ok=no
103  	      fi
104              ])
105        fi
106
107	if test $_libcurl_wanted -eq 0 || test "x$libcurl_cv_lib_version_ok" = "xyes"; then
108           if test "x$LIBCURL_CFLAGS" = "x"; then
109              LIBCURL_CFLAGS=`$_libcurl_config --cflags`
110           fi
111           if test "x$LIBCURL_LIBS" = "x"; then
112		_full_libcurl_libs=`$_libcurl_config --libs`
113		for i in $_full_libcurl_libs; do
114			case $i in
115				-L*)
116					LIBCURL_LDFLAGS="$LIBCURL_LDFLAGS $i"
117			;;
118				-l*)
119					LIBCURL_LIBS="$LIBCURL_LIBS $i"
120			;;
121			esac
122		done
123
124		if test "x$enable_static" = "xyes"; then
125			_full_libcurl_libs=`$_libcurl_config --static-libs`
126			for i in $_full_libcurl_libs; do
127				case $i in
128					-lcurl)
129				;;
130					-l*)
131						_lib_name=`echo "$i" | cut -b3-`
132						AC_CHECK_LIB($_lib_name , main,[
133								LIBCURL_LIBS="$LIBCURL_LIBS $i"
134							],[
135								AC_MSG_ERROR([static library $_lib_name required for linking libcurl not found])
136							])
137
138				;;
139				esac
140			done
141		fi
142
143		_save_curl_cflags="$CFLAGS"
144		_save_curl_ldflags="$LDFLAGS"
145		_save_curl_libs="$LIBS"
146		CFLAGS="$CFLAGS $LIBCURL_CFLAGS"
147		LDFLAGS="$LDFLAGS $LIBCURL_LDFLAGS"
148		LIBS="$LIBS $LIBCURL_LIBS"
149
150		AC_CHECK_LIB(curl, main, , [AC_MSG_ERROR([libcurl library not found])])
151
152		CFLAGS="$_save_curl_cflags"
153		LDFLAGS="$_save_curl_ldflags"
154		LIBS="$_save_curl_libs"
155		unset _save_curl_cflags
156		unset _save_curl_ldflags
157		unset _save_curl_libs
158
159              # This is so silly, but Apple actually has a bug in their
160	      # curl-config script.  Fixed in Tiger, but there are still
161	      # lots of Panther installs around.
162              case "${host}" in
163                 powerpc-apple-darwin7*)
164                    LIBCURL_LIBS=`echo $LIBCURL_LIBS | sed -e 's|-arch i386||g'`
165                 ;;
166              esac
167           fi
168
169	   # All curl-config scripts support --feature
170	   _libcurl_features=`$_libcurl_config --feature`
171
172           # Is it modern enough to have --protocols? (7.12.4)
173	   if test $_libcurl_version -ge 461828; then
174              _libcurl_protocols=`$_libcurl_config --protocols`
175           fi
176
177           _libcurl_try_link=yes
178	fi
179
180	unset _libcurl_wanted
181     fi
182     if test "x$_libcurl_try_link" = "xyes"; then
183        # we didn't find curl-config, so let's see if the user-supplied
184        # link line (or failing that, "-lcurl") is enough.
185        LIBCURL_LIBS=${LIBCURL_LIBS-"$_libcurl_libs -lcurl"}
186
187        AC_CACHE_CHECK([whether libcurl is usable],
188           [libcurl_cv_lib_curl_usable],
189           [
190		_save_curl_libs="${LIBS}"
191		_save_curl_ldflags="${LDFLAGS}"
192		_save_curl_cflags="${CFLAGS}"
193		LIBS="${LIBS} ${LIBCURL_LIBS}"
194		LDFLAGS="${LDFLAGS} ${LIBCURL_LDFLAGS}"
195		CFLAGS="${CFLAGS} ${LIBCURL_CFLAGS}"
196
197           AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <curl/curl.h>
198#ifndef NULL
199#define NULL (void *)0
200#endif],[
201/* Try and use a few common options to force a failure if we are
202   missing symbols or can't link. */
203int x;
204curl_easy_setopt(NULL,CURLOPT_URL,NULL);
205x=CURL_ERROR_SIZE;
206x=CURLOPT_WRITEFUNCTION;
207x=CURLOPT_FILE;
208x=CURLOPT_ERRORBUFFER;
209x=CURLOPT_STDERR;
210x=CURLOPT_VERBOSE;
211])],libcurl_cv_lib_curl_usable=yes,libcurl_cv_lib_curl_usable=no)
212
213		LIBS="${_save_curl_libs}"
214		LDFLAGS="${_save_curl_ldflags}"
215		CFLAGS="${_save_curl_cflags}"
216		unset _save_curl_libs
217		unset _save_curl_ldflags
218		unset _save_curl_cflags
219	])
220
221	if test "x$libcurl_cv_lib_curl_usable" = "xno"; then
222		link_mode="dynamic"
223		if test "x$enable_static" = "xyes"; then
224			link_mode="static"
225		fi
226		AC_MSG_ERROR([libcurl is not available for ${link_mode} linking])
227	fi
228
229	# Does curl_free() exist in this version of libcurl?
230	# If not, fake it with free()
231
232	_save_curl_libs="${LIBS}"
233	_save_curl_ldflags="${LDFLAGS}"
234	_save_curl_cflags="${CFLAGS}"
235	LIBS="${LIBS} ${LIBCURL_LIBS}"
236	LDFLAGS="${LDFLAGS} ${LIBCURL_LDFLAGS}"
237	CFLAGS="${CFLAGS} ${LIBCURL_CFLAGS}"
238
239	AC_CHECK_FUNC(curl_free,,
240		AC_DEFINE(curl_free,free,
241			[Define curl_free() as free() if our version of curl lacks curl_free.]))
242
243	AC_CHECK_FUNC(curl_easy_escape,
244		AC_DEFINE(HAVE_FUNCTION_CURL_EASY_ESCAPE,1,
245			[Define to 1 if function 'curl_easy_escape' exists.]))
246
247	LIBS="${_save_curl_libs}"
248	LDFLAGS="${_save_curl_ldflags}"
249	CFLAGS="${_save_curl_cflags}"
250	unset _save_curl_libs
251	unset _save_curl_ldflags
252	unset _save_curl_cflags
253
254	AC_DEFINE(HAVE_LIBCURL,1,
255		[Define to 1 if you have a functional curl library.])
256	AC_SUBST(LIBCURL_CFLAGS)
257	AC_SUBST(LIBCURL_LDFLAGS)
258	AC_SUBST(LIBCURL_LIBS)
259	found_curl="yes"
260
261	for _libcurl_feature in $_libcurl_features ; do
262		AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_feature_$_libcurl_feature),[1])
263		eval AS_TR_SH(libcurl_feature_$_libcurl_feature)=yes
264	done
265
266	if test "x$_libcurl_protocols" = "x"; then
267		# We don't have --protocols, so just assume that all
268		# protocols are available
269		_libcurl_protocols="HTTP FTP FILE TELNET LDAP DICT"
270
271		if test "x$libcurl_feature_SSL" = "xyes"; then
272			_libcurl_protocols="$_libcurl_protocols HTTPS"
273
274			# FTPS wasn't standards-compliant until version
275			# 7.11.0
276			if test $_libcurl_version -ge 461568; then
277				_libcurl_protocols="$_libcurl_protocols FTPS"
278			fi
279		fi
280	fi
281
282	for _libcurl_protocol in $_libcurl_protocols ; do
283		AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_protocol_$_libcurl_protocol),[1])
284		eval AS_TR_SH(libcurl_protocol_$_libcurl_protocol)=yes
285        done
286     else
287	   unset LIBCURL_LIBS
288	   unset LIBCURL_CFLAGS
289     fi
290
291     unset _libcurl_try_link
292     unset _libcurl_version_parse
293     unset _libcurl_config
294     unset _libcurl_feature
295     unset _libcurl_features
296     unset _libcurl_protocol
297     unset _libcurl_protocols
298     unset _libcurl_version
299     unset _libcurl_libs
300  fi
301
302  if test "x$want_curl" = "xno" || test "x$libcurl_cv_lib_curl_usable" != "xyes"; then
303     # This is the IF-NO path
304     ifelse([$4],,:,[$4])
305  else
306     # This is the IF-YES path
307     ifelse([$3],,:,[$3])
308  fi
309
310])dnl
311