Change the configure script to build a test program against libcurl to make

sure the results from curl-config can be used to compile successfully.  This is
intended to help prevent a situation where you are cross compiling, and the
configure script finds the curl library installed on the host.
(issue #9865, reported and patched by zandbelt)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@67026 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configure

@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac Revision: 66157 .
+# From configure.ac Revision: 66160 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61.
 #
@@ -30528,12 +30528,71 @@ fi
       if test $(printf "%d" 0x$(${CURL_CONFIG} --vernum)) -ge $(printf "%d" 0x070907); then
          CURL_INCLUDE=$(${CURL_CONFIG} --cflags)
          CURL_LIB=$(${CURL_CONFIG} --libs)
-         PBX_CURL=1
+
+         { echo "$as_me:$LINENO: checking for curl_version() in curl/curl.h" >&5
+echo $ECHO_N "checking for curl_version() in curl/curl.h... $ECHO_C" >&6; }
+         saved_cppflags="${CPPFLAGS}"
+         CPPFLAGS="${CPPFLAGS} ${CURL_INCLUDE}"
+         cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <curl/curl.h>
+int
+main ()
+{
+curl_version();
+  ;
+  return 0;
+}
+
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_compile") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest.$ac_objext; then
+
+                { echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6; }
+                ac_cv_curl_h="yes"
+
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+
+                { echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6; }
+                ac_cv_curl_h="no"
+
+
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+	 CPPFLAGS="${saved_cppflags}"
+         if test "${ac_cv_curl_h}" = "yes"; then
+             PBX_CURL=1
 
 cat >>confdefs.h <<\_ACEOF
 #define HAVE_CURL 1
 _ACEOF
 
+         fi
       fi
    fi
 fi

configure.ac

@@ -1130,8 +1130,27 @@ if test "${USE_CURL}" != "no"; then
       if test $(printf "%d" 0x$(${CURL_CONFIG} --vernum)) -ge $(printf "%d" 0x070907); then
          CURL_INCLUDE=$(${CURL_CONFIG} --cflags)
          CURL_LIB=$(${CURL_CONFIG} --libs)
-         PBX_CURL=1
-         AC_DEFINE([HAVE_CURL], 1, [Define if your system has the curl libraries.])
+
+         AC_MSG_CHECKING(for curl_version() in curl/curl.h)
+         saved_cppflags="${CPPFLAGS}"
+         CPPFLAGS="${CPPFLAGS} ${CURL_INCLUDE}"
+         AC_COMPILE_IFELSE(
+            [AC_LANG_PROGRAM(
+                [#include <curl/curl.h>],
+                    [curl_version();])
+            ],[
+                AC_MSG_RESULT(yes)
+                ac_cv_curl_h="yes"
+            ],[
+                AC_MSG_RESULT(no)
+                ac_cv_curl_h="no"
+            ]
+	 )
+	 CPPFLAGS="${saved_cppflags}"
+         if test "${ac_cv_curl_h}" = "yes"; then
+             PBX_CURL=1
+             AC_DEFINE([HAVE_CURL], 1, [Define if your system has the curl libraries.])
+         fi
       fi
    fi
 fi