curl: fix symbolic constant typechecks with curl_easy_setopt()

As with the previous two commits, we should be passing long integers,
not regular ones, to curl_easy_setopt(), and compiling against curl 8.14
loudly complains if we don't.

This patch catches the remaining cases, which are ones where we pass
curl's own symbolic constants. We'll cast them to long manually in each
call.

It seems kind of weird to me that curl doesn't define these constants as
longs, since the point of them is to pass to curl_easy_setopt(). But in
the curl documentation and examples, they clearly show casting them as
part of the setopt calls. It may be that there is some reason not to
push the type into the macro, like backwards compatibility. I didn't
dig, as it doesn't really matter: we have to follow what existing curl
versions ask for anyway.

Backported-from: 4558c8f (curl: fix symbolic constant typechecks with curl_easy_setopt(), 2025-06-04)
Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>
Signed-off-by: Johannes Schindelin <[email protected]>

Author: peff

http.c

@@ -1142,7 +1142,7 @@ static CURL *get_curl_handle(void)
 	}
 
 	curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20L);
-	curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
+	curl_easy_setopt(result, CURLOPT_POSTREDIR, (long)CURL_REDIR_POST_ALL);
 
 #ifdef GIT_CURL_HAVE_CURLOPT_PROTOCOLS_STR
 	{
@@ -1217,18 +1217,18 @@ static CURL *get_curl_handle(void)
 
 		if (starts_with(curl_http_proxy, "socks5h"))
 			curl_easy_setopt(result,
-				CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
+				CURLOPT_PROXYTYPE, (long)CURLPROXY_SOCKS5_HOSTNAME);
 		else if (starts_with(curl_http_proxy, "socks5"))
 			curl_easy_setopt(result,
-				CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
+				CURLOPT_PROXYTYPE, (long)CURLPROXY_SOCKS5);
 		else if (starts_with(curl_http_proxy, "socks4a"))
 			curl_easy_setopt(result,
-				CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
+				CURLOPT_PROXYTYPE, (long)CURLPROXY_SOCKS4A);
 		else if (starts_with(curl_http_proxy, "socks"))
 			curl_easy_setopt(result,
-				CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
+				CURLOPT_PROXYTYPE, (long)CURLPROXY_SOCKS4);
 		else if (starts_with(curl_http_proxy, "https")) {
-			curl_easy_setopt(result, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
+			curl_easy_setopt(result, CURLOPT_PROXYTYPE, (long)CURLPROXY_HTTPS);
 
 			if (http_proxy_ssl_cert)
 				curl_easy_setopt(result, CURLOPT_PROXY_SSLCERT, http_proxy_ssl_cert);