From 50482b8c0a2cf5315e66d182998c8fc4901ffb2d Mon Sep 17 00:00:00 2001
From: Don J Olmstead <don.j.olmstead@gmail.com>
Date: Mon, 25 Feb 2019 14:17:51 -0800
Subject: curl.h: use __has_declspec_attribute for shared builds

Closes #3616
---
 include/curl/curl.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/curl/curl.h b/include/curl/curl.h
index 88e1f39e8..f501fe631 100644
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -91,6 +91,11 @@
 #include <support/SupportDefs.h>
 #endif
 
+/* Compatibility for non-Clang compilers */
+#ifndef __has_declspec_attribute
+#  define __has_declspec_attribute(x) 0
+#endif
+
 #ifdef  __cplusplus
 extern "C" {
 #endif
@@ -109,7 +114,9 @@ typedef void CURLSH;
 
 #ifdef CURL_STATICLIB
 #  define CURL_EXTERN
-#elif defined(WIN32) || defined(_WIN32) || defined(__SYMBIAN32__)
+#elif defined(WIN32) || defined(_WIN32) || defined(__SYMBIAN32__) || \
+     (__has_declspec_attribute(dllexport) && \
+      __has_declspec_attribute(dllimport))
 #  if defined(BUILDING_LIBCURL)
 #    define CURL_EXTERN  __declspec(dllexport)
 #  else
-- 
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