From b8e0fe19ec3bd3b673a14043a4b5e656d9c26d06 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Thu, 21 Sep 2017 23:30:48 +0200
Subject: [PATCH] vtls: provide curl_global_sslset() even in non-SSL builds

... it just returns error:

Bug: https://github.com/curl/curl/commit/1328f69d53f2f2e937696ea954c480412b018451#commitcomment-24470367
Reported-by: Marcel Raad

Closes #1906
---
 docs/libcurl/curl_global_sslset.3 |  7 +++++--
 include/curl/curl.h               |  3 ++-
 lib/vtls/vtls.c                   | 12 +++++++++++-
 3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/docs/libcurl/curl_global_sslset.3 b/docs/libcurl/curl_global_sslset.3
index b438f8ad0..cee84458f 100644
--- a/docs/libcurl/curl_global_sslset.3
+++ b/docs/libcurl/curl_global_sslset.3
@@ -85,10 +85,13 @@ support for choosing SSL backends at runtime.
 If this function returns CURLSSLSET_OK, the backend was successfully selected.
 
 If the chosen backend is unknown (or support for the chosed backend has not
-been compiled into libcurl), the function returns CURLSSLSET_UNKNOWN_BACKEND.
+been compiled into libcurl), the function returns \fICURLSSLSET_UNKNOWN_BACKEND\fP.
 
 If the backend had been configured previously, or if \fIcurl_global_init(3)\fP
-has already been called, the function returns CURLSSLSET_TOO_LATE.
+has already been called, the function returns \fICURLSSLSET_TOO_LATE\fP.
+
+If this libcurl was built completely without SSL support, with no backends at
+all, this function returns \fICURLSSLSET_NO_BACKENDS\fP.
 .SH "SEE ALSO"
 .BR curl_global_init "(3), "
 .BR libcurl "(3) "
diff --git a/include/curl/curl.h b/include/curl/curl.h
index 8b153fef9..501e3d19b 100644
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -2370,7 +2370,8 @@ typedef struct {
 typedef enum {
   CURLSSLSET_OK = 0,
   CURLSSLSET_UNKNOWN_BACKEND,
-  CURLSSLSET_TOO_LATE
+  CURLSSLSET_TOO_LATE,
+  CURLSSLSET_NO_BACKENDS /* libcurl was built without any SSL support */
 } CURLsslset;
 
 CURL_EXTERN CURLsslset curl_global_sslset(curl_sslbackend id, const char *name,
diff --git a/lib/vtls/vtls.c b/lib/vtls/vtls.c
index 6e230ee22..56eb7ebf1 100644
--- a/lib/vtls/vtls.c
+++ b/lib/vtls/vtls.c
@@ -1296,4 +1296,14 @@ CURLsslset curl_global_sslset(curl_sslbackend id, const char *name,
   return CURLSSLSET_UNKNOWN_BACKEND;
 }
 
-#endif /* USE_SSL */
+#else /* USE_SSL */
+CURLsslset curl_global_sslset(curl_sslbackend id, const char *name,
+                              const curl_ssl_backend ***avail)
+{
+  (void)id;
+  (void)name;
+  (void)avail;
+  return CURLSSLSET_NO_BACKENDS;
+}
+
+#endif /* !USE_SSL */