lib: fix compiler warnings with `CURL_DISABLE_VERBOSE_STRINGS`

Closes https://github.com/curl/curl/pull/4775

4 files changed, 15 insertions, 10 deletions

diff --git a/lib/connect.c b/lib/connect.c
index 3b88a5962..611d6d2f0 100644
--- a/lib/connect.c
+++ b/lib/connect.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -932,9 +932,11 @@ CURLcode Curl_is_connected(struct connectdata *conn,
       SET_SOCKERRNO(error);
       if(conn->tempaddr[i]) {
         CURLcode status;
+#ifndef CURL_DISABLE_VERBOSE_STRINGS
         char ipaddress[MAX_IPADR_LEN];
         char buffer[STRERROR_LEN];
         Curl_printable_address(conn->tempaddr[i], ipaddress, MAX_IPADR_LEN);
+#endif
         infof(data, "connect to %s port %ld failed: %s\n",
               ipaddress, conn->port,
               Curl_strerror(error, buffer, sizeof(buffer)));
@@ -992,14 +994,12 @@ CURLcode Curl_is_connected(struct connectdata *conn,
 static void tcpnodelay(struct connectdata *conn, curl_socket_t sockfd)
 {
 #if defined(TCP_NODELAY)
-#if !defined(CURL_DISABLE_VERBOSE_STRINGS)
-  struct Curl_easy *data = conn->data;
-#endif
   curl_socklen_t onoff = (curl_socklen_t) 1;
   int level = IPPROTO_TCP;
+#if !defined(CURL_DISABLE_VERBOSE_STRINGS)
+  struct Curl_easy *data = conn->data;
   char buffer[STRERROR_LEN];
-
-#if defined(CURL_DISABLE_VERBOSE_STRINGS)
+#else
   (void) conn;
 #endif
 
diff --git a/lib/http.c b/lib/http.c
index 35d2e9fb0..837f53c41 100644
--- a/lib/http.c
+++ b/lib/http.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -641,7 +641,7 @@ output_auth_headers(struct connectdata *conn,
 {
   const char *auth = NULL;
   CURLcode result = CURLE_OK;
-#if !defined(CURL_DISABLE_VERBOSE_STRINGS) || defined(USE_SPNEGO)
+#if !defined(CURL_DISABLE_VERBOSE_STRINGS)
   struct Curl_easy *data = conn->data;
 #endif
 
diff --git a/lib/strerror.c b/lib/strerror.c
index f4f5a93a4..29df5aa55 100644
--- a/lib/strerror.c
+++ b/lib/strerror.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 2004 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2004 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -449,7 +449,9 @@ curl_share_strerror(CURLSHcode error)
 static const char *
 get_winsock_error (int err, char *buf, size_t len)
 {
+#ifndef CURL_DISABLE_VERBOSE_STRINGS
   const char *p;
+#endif
 
   if(!len)
     return NULL;
@@ -457,6 +459,7 @@ get_winsock_error (int err, char *buf, size_t len)
   *buf = '\0';
 
 #ifdef CURL_DISABLE_VERBOSE_STRINGS
+  (void)err;
   return NULL;
 #else
   switch(err) {
diff --git a/lib/vtls/schannel.c b/lib/vtls/schannel.c
index 5ab093b38..dc58ed0d3 100644
--- a/lib/vtls/schannel.c
+++ b/lib/vtls/schannel.c
@@ -7,7 +7,7 @@
  *
  * Copyright (C) 2012 - 2016, Marc Hoersken, <info@marc-hoersken.de>
  * Copyright (C) 2012, Mark Salisbury, <mark.salisbury@hp.com>
- * Copyright (C) 2012 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2012 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -1855,7 +1855,9 @@ schannel_recv(struct connectdata *conn, int sockindex,
       goto cleanup;
     }
     else {
+#ifndef CURL_DISABLE_VERBOSE_STRINGS
       char buffer[STRERROR_LEN];
+#endif
       *err = CURLE_RECV_ERROR;
       infof(data, "schannel: failed to read data from server: %s\n",
             Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));