From: Jay Satiro <raysatiro@yahoo.com>
Date: Thu, 1 Apr 2021 19:15:01 +0000 (-0400)
Subject: hostip: Fix for builds that disable all asynchronous DNS
X-Git-Tag: curl-7_76_1~28
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3085ccfae996bb0fa606d2c7bc6783dc15d76a30;p=thirdparty%2Fcurl.git

hostip: Fix for builds that disable all asynchronous DNS

- Define Curl_resolver_error function only when USE_CURL_ASYNC.

Prior to this change building curl without an asynchronous resolver
backend (c-ares or threaded) and without DoH (DNS-over-HTTPS, which is
also asynchronous but independent of resolver backend) would cause a
build error since Curl_resolver_error is called by and evaluates
variables only available in asynchronous builds.

Reported-by: Benbuck Nason

Fixes https://github.com/curl/curl/issues/6831
Closes https://github.com/curl/curl/pull/6832
---

diff --git a/lib/hostip.c b/lib/hostip.c
index 750afe8a97..34fb7db65e 100644
--- a/lib/hostip.c
+++ b/lib/hostip.c
@@ -1130,6 +1130,7 @@ CURLcode Curl_once_resolved(struct Curl_easy *data, bool *protocol_done)
  * resolve error
  */
 
+#ifdef USE_CURL_ASYNC
 CURLcode Curl_resolver_error(struct Curl_easy *data)
 {
   const char *host_or_proxy;
@@ -1153,3 +1154,4 @@ CURLcode Curl_resolver_error(struct Curl_easy *data)
 
   return result;
 }
+#endif /* USE_CURL_ASYNC */