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@ and @LIBCURL_CPPFLAGS@ 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="-lcurl" LIBCURL_CPPFLAGS="-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  AC_ARG_WITH(libcurl,
60     AC_HELP_STRING([--with-libcurl=DIR],[look for the curl library in DIR]),
61     [_libcurl_with=$withval],[_libcurl_with=ifelse([$1],,[yes],[$1])])
62
63  if test "$_libcurl_with" != "no" ; then
64
65     AC_PROG_AWK
66
67     _libcurl_version_parse="eval $AWK '{split(\$NF,A,\".\"); X=256*256*A[[1]]+256*A[[2]]+A[[3]]; print X;}'"
68
69     _libcurl_try_link=yes
70
71     if test -d "$_libcurl_with" ; then
72        LIBCURL_CPPFLAGS="-I$withval/include"
73        _libcurl_ldflags="-L$withval/lib"
74        AC_PATH_PROG([_libcurl_config],[curl-config],["$withval/bin"],
75                     ["$withval/bin"])
76     else
77	AC_PATH_PROG([_libcurl_config],[curl-config])
78     fi
79
80     if test x$_libcurl_config != "x" ; then
81        AC_CACHE_CHECK([for the version of libcurl],
82	   [libcurl_cv_lib_curl_version],
83           [libcurl_cv_lib_curl_version=`$_libcurl_config --version | $AWK '{print $[]2}'`])
84
85	_libcurl_version=`echo $libcurl_cv_lib_curl_version | $_libcurl_version_parse`
86	_libcurl_wanted=`echo ifelse([$2],,[0],[$2]) | $_libcurl_version_parse`
87
88        if test $_libcurl_wanted -gt 0 ; then
89	   AC_CACHE_CHECK([for libcurl >= version $2],
90	      [libcurl_cv_lib_version_ok],
91              [
92   	      if test $_libcurl_version -ge $_libcurl_wanted ; then
93	         libcurl_cv_lib_version_ok=yes
94      	      else
95	         libcurl_cv_lib_version_ok=no
96  	      fi
97              ])
98        fi
99
100	if test $_libcurl_wanted -eq 0 || test x$libcurl_cv_lib_version_ok = xyes ; then
101           if test x"$LIBCURL_CPPFLAGS" = "x" ; then
102              LIBCURL_CPPFLAGS=`$_libcurl_config --cflags`
103           fi
104           if test x"$LIBCURL" = "x" ; then
105              LIBCURL=`$_libcurl_config --libs`
106
107              # This is so silly, but Apple actually has a bug in their
108	      # curl-config script.  Fixed in Tiger, but there are still
109	      # lots of Panther installs around.
110              case "${host}" in
111                 powerpc-apple-darwin7*)
112                    LIBCURL=`echo $LIBCURL | sed -e 's|-arch i386||g'`
113                 ;;
114              esac
115           fi
116
117	   # All curl-config scripts support --feature
118	   _libcurl_features=`$_libcurl_config --feature`
119
120           # Is it modern enough to have --protocols? (7.12.4)
121	   if test $_libcurl_version -ge 461828 ; then
122              _libcurl_protocols=`$_libcurl_config --protocols`
123           fi
124	else
125           _libcurl_try_link=no
126	fi
127
128	unset _libcurl_wanted
129     fi
130
131     if test $_libcurl_try_link = yes ; then
132
133        # we didn't find curl-config, so let's see if the user-supplied
134        # link line (or failing that, "-lcurl") is enough.
135        LIBCURL=${LIBCURL-"$_libcurl_ldflags -lcurl"}
136
137        AC_CACHE_CHECK([whether libcurl is usable],
138           [libcurl_cv_lib_curl_usable],
139           [
140           _libcurl_save_cppflags=$CPPFLAGS
141           CPPFLAGS="$LIBCURL_CPPFLAGS $CPPFLAGS"
142           _libcurl_save_libs=$LIBS
143           LIBS="$LIBCURL $LIBS"
144
145           AC_LINK_IFELSE(AC_LANG_PROGRAM([#include <curl/curl.h>],[
146/* Try and use a few common options to force a failure if we are
147   missing symbols or can't link. */
148int x;
149curl_easy_setopt(NULL,CURLOPT_URL,NULL);
150x=CURL_ERROR_SIZE;
151x=CURLOPT_WRITEFUNCTION;
152x=CURLOPT_FILE;
153x=CURLOPT_ERRORBUFFER;
154x=CURLOPT_STDERR;
155x=CURLOPT_VERBOSE;
156]),libcurl_cv_lib_curl_usable=yes,libcurl_cv_lib_curl_usable=no)
157
158           CPPFLAGS=$_libcurl_save_cppflags
159           LIBS=$_libcurl_save_libs
160           unset _libcurl_save_cppflags
161           unset _libcurl_save_libs
162           ])
163
164        if test $libcurl_cv_lib_curl_usable = yes ; then
165
166	   # Does curl_free() exist in this version of libcurl?
167	   # If not, fake it with free()
168
169           _libcurl_save_cppflags=$CPPFLAGS
170           CPPFLAGS="$CPPFLAGS $LIBCURL_CPPFLAGS"
171           _libcurl_save_libs=$LIBS
172           LIBS="$LIBS $LIBCURL"
173
174           AC_CHECK_FUNC(curl_free,,
175  	      AC_DEFINE(curl_free,free,
176		[Define curl_free() as free() if our version of curl lacks curl_free.]))
177
178           CPPFLAGS=$_libcurl_save_cppflags
179           LIBS=$_libcurl_save_libs
180           unset _libcurl_save_cppflags
181           unset _libcurl_save_libs
182
183           AC_DEFINE(HAVE_LIBCURL,1,
184             [Define to 1 if you have a functional curl library.])
185           AC_SUBST(LIBCURL_CPPFLAGS)
186           AC_SUBST(LIBCURL)
187
188           for _libcurl_feature in $_libcurl_features ; do
189	      AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_feature_$_libcurl_feature),[1])
190	      eval AS_TR_SH(libcurl_feature_$_libcurl_feature)=yes
191           done
192
193	   if test "x$_libcurl_protocols" = "x" ; then
194
195	      # We don't have --protocols, so just assume that all
196	      # protocols are available
197	      _libcurl_protocols="HTTP FTP FILE TELNET LDAP DICT"
198
199	      if test x$libcurl_feature_SSL = xyes ; then
200	         _libcurl_protocols="$_libcurl_protocols HTTPS"
201
202		 # FTPS wasn't standards-compliant until version
203		 # 7.11.0
204		 if test $_libcurl_version -ge 461568; then
205		    _libcurl_protocols="$_libcurl_protocols FTPS"
206		 fi
207	      fi
208	   fi
209
210	   for _libcurl_protocol in $_libcurl_protocols ; do
211	      AC_DEFINE_UNQUOTED(AS_TR_CPP(libcurl_protocol_$_libcurl_protocol),[1])
212	      eval AS_TR_SH(libcurl_protocol_$_libcurl_protocol)=yes
213           done
214	else
215	   unset LIBCURL
216	   unset LIBCURL_CPPFLAGS
217        fi
218     fi
219
220     unset _libcurl_try_link
221     unset _libcurl_version_parse
222     unset _libcurl_config
223     unset _libcurl_feature
224     unset _libcurl_features
225     unset _libcurl_protocol
226     unset _libcurl_protocols
227     unset _libcurl_version
228     unset _libcurl_ldflags
229  fi
230
231  if test x$_libcurl_with = xno || test x$libcurl_cv_lib_curl_usable != xyes ; then
232     # This is the IF-NO path
233     ifelse([$4],,:,[$4])
234  else
235     # This is the IF-YES path
236     ifelse([$3],,:,[$3])
237  fi
238
239  unset _libcurl_with
240])dnl
241