cmake: Fix passing _WINSOCKAPI_ macro to compiler

Define _WINSOCKAPI_ blank rather than to 1 in order to match the value
used by Microsoft's winsock header files.

Closes https://github.com/curl/curl/pull/1195

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 31a0d41e3528f5e92ed662f8bfd44b06d39faab4..14ecceba8e66d67b2e8a981dcfbff8b13368c3bf 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -251,7 +251,7 @@ include (CMakeDependentOption)
 
 # On windows preload settings
 if(WIN32)
-  set(CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS} -D_WINSOCKAPI_")
+  set(CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS} -D_WINSOCKAPI_=")
   include(${CMAKE_CURRENT_SOURCE_DIR}/CMake/Platforms/WindowsCache.cmake)
 endif(WIN32)