From cd95965f6f68ac20a3c3ffcc09acdc0671f5a67a Mon Sep 17 00:00:00 2001
From: Scott Cantor <cantor.2@osu.edu>
Date: Tue, 21 Nov 2006 01:15:47 +0000
Subject: [PATCH] Add libcurl and covariant return checks.

---
 configure.ac | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/configure.ac b/configure.ac
index 50581d0..b81dbb5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -107,12 +107,42 @@ AC_TRY_LINK_FUNC([ERR_load_CRYPTO_strings],,
              AC_MSG_ERROR([unable to link with openssl libraries]))
 AC_MSG_RESULT(yes)
 
+# libcurl settings
+AC_PATH_PROG(CURL_CONFIG,curl-config)
+AC_ARG_WITH(curl,
+    AC_HELP_STRING([--with-curl=PATH], [where curl-config is installed]),
+    [
+    CURL_CONFIG="${with_curl}"
+    if ! test -f "${CURL_CONFIG}" ; then
+    	CURL_CONFIG="${with_curl}/bin/curl-config"
+    fi
+    ])
+if test -f "${CURL_CONFIG}" ; then
+    LDFLAGS="`${CURL_CONFIG} --libs` $LDFLAGS"
+    CPPFLAGS="`${CURL_CONFIG} --cflags` $CPPFLAGS"
+else
+    AC_MSG_ERROR([curl-config not found, may need to use --with-curl option])
+fi
+AC_CHECK_HEADER([curl/curl.h],,AC_MSG_ERROR([unable to find libcurl header files]))
+AC_CHECK_LIB([curl],[curl_global_init],,AC_MSG_ERROR([unable to link with libcurl]))
+AC_MSG_CHECKING([for CURLOPT_SSL_CTX_FUNCTION in curl.h])
+AC_EGREP_HEADER([CURLOPT_SSL_CTX_FUNCTION], [curl/curl.h],
+		[AC_MSG_RESULT(yes)],
+		[AC_MSG_ERROR([need libcurl that supports CURLOPT_SSL_CTX_FUNCTION])])
+
+
 AC_LANG(C++)
 
 # C++ requirements
 AC_CXX_REQUIRE_STL
 AC_CXX_NAMESPACES
 
+# are covariant methods allowed?
+AC_TRY_LINK(
+     [ class base { public: virtual base *GetPtr( void ) { return this; } }; ],
+     [ class derived: virtual public base { public: virtual derived *GetPtr( void ) { return this; } }; ],
+     [AC_DEFINE(HAVE_COVARIANT_RETURNS,1,[Define if C++ compiler supports covariant virtual methods.])])
+
 # log4cpp settings
 AC_PATH_PROG(LOG4CPP_CONFIG,log4cpp-config)
 AC_ARG_WITH(log4cpp,
-- 
2.1.4