Problem: cmake run is very slow with MSVC

Solution: skip tests than can never succeed with MSVC

CMakeLists.txt

@@ -103,16 +103,17 @@ set (POLLER "" CACHE STRING "Choose polling system for I/O threads. valid values
 include (CheckFunctionExists)
 include (CheckTypeSize)
 
-if (POLLER STREQUAL "")
+if (NOT MSVC)
+    if (POLLER STREQUAL "")
         set (CMAKE_REQUIRED_INCLUDES sys/event.h)
         check_function_exists (kqueue HAVE_KQUEUE)
         set (CMAKE_REQUIRED_INCLUDES)
         if (HAVE_KQUEUE)
             set (POLLER "kqueue")
         endif()
-endif ()
+    endif ()
 
-if (POLLER STREQUAL "")
+    if (POLLER STREQUAL "")
         set (CMAKE_REQUIRED_INCLUDES sys/epoll.h)
         check_function_exists (epoll_create HAVE_EPOLL)
         set (CMAKE_REQUIRED_INCLUDES)
@@ -123,34 +124,35 @@ if (POLLER STREQUAL "")
                 set (ZMQ_IOTHREAD_POLLER_USE_EPOLL_CLOEXEC 1)
             endif ()
         endif ()
-endif ()
+    endif ()
 
-if (POLLER STREQUAL "")
+    if (POLLER STREQUAL "")
         set (CMAKE_REQUIRED_INCLUDES sys/devpoll.h)
         check_type_size ("struct pollfd" DEVPOLL)
         set (CMAKE_REQUIRED_INCLUDES)
         if (HAVE_DEVPOLL)
             set (POLLER "devpoll")
         endif ()
-endif ()
+    endif ()
 
-if (POLLER STREQUAL "")
+    if (POLLER STREQUAL "")
         set (CMAKE_REQUIRED_INCLUDES sys/pollset.h)
         check_function_exists (pollset_create HAVE_POLLSET)
         set (CMAKE_REQUIRED_INCLUDES)
         if (HAVE_POLLSET)
             set (POLLER "pollset")
         endif()
-endif ()
+    endif ()
 
-if (POLLER STREQUAL "")
+    if (POLLER STREQUAL "")
         set (CMAKE_REQUIRED_INCLUDES poll.h)
         check_function_exists (poll HAVE_POLL)
         set (CMAKE_REQUIRED_INCLUDES)
         if (HAVE_POLL)
             set (POLLER "poll")
         endif ()
-endif ()
+    endif ()
+endif()
 
 if (POLLER STREQUAL "")
     if (WIN32)
@@ -213,18 +215,19 @@ include (CMakeDependentOption)
 include (CheckCXXSymbolExists)
 include (CheckSymbolExists)
 
-check_include_files (ifaddrs.h ZMQ_HAVE_IFADDRS)
 check_include_files (windows.h ZMQ_HAVE_WINDOWS)
 if(CMAKE_SYSTEM_NAME STREQUAL "WindowsStore" AND CMAKE_SYSTEM_VERSION STREQUAL "10.0")
   SET(ZMQ_HAVE_WINDOWS_UWP ON)
   ADD_DEFINITIONS(-D_WIN32_WINNT=_WIN32_WINNT_WIN10)
 endif()
-check_include_files (sys/uio.h ZMQ_HAVE_UIO)
-check_include_files (sys/eventfd.h ZMQ_HAVE_EVENTFD)
-if (ZMQ_HAVE_EVENTFD AND NOT CMAKE_CROSSCOMPILING)
+if (NOT MSVC)
+    check_include_files (ifaddrs.h ZMQ_HAVE_IFADDRS)
+    check_include_files (sys/uio.h ZMQ_HAVE_UIO)
+    check_include_files (sys/eventfd.h ZMQ_HAVE_EVENTFD)
+    if (ZMQ_HAVE_EVENTFD AND NOT CMAKE_CROSSCOMPILING)
       zmq_check_efd_cloexec ()
-endif ()
-
+    endif ()
+endif()
 
 if (ZMQ_HAVE_WINDOWS)
   # Cannot use check_library_exists because the symbol is always declared as char(*)(void)
@@ -264,25 +267,27 @@ if (WIN32 AND NOT CYGWIN)
   endif ()
 endif ()
 
-set (CMAKE_REQUIRED_LIBRARIES rt)
-check_function_exists (clock_gettime HAVE_CLOCK_GETTIME)
-set (CMAKE_REQUIRED_LIBRARIES)
+if (NOT MSVC)
+    set (CMAKE_REQUIRED_LIBRARIES rt)
+    check_function_exists (clock_gettime HAVE_CLOCK_GETTIME)
+    set (CMAKE_REQUIRED_LIBRARIES)
 
-set (CMAKE_REQUIRED_INCLUDES unistd.h)
-check_function_exists (fork HAVE_FORK)
-set (CMAKE_REQUIRED_INCLUDES)
+    set (CMAKE_REQUIRED_INCLUDES unistd.h)
+    check_function_exists (fork HAVE_FORK)
+    set (CMAKE_REQUIRED_INCLUDES)
 
-set (CMAKE_REQUIRED_INCLUDES sys/time.h)
-check_function_exists (gethrtime HAVE_GETHRTIME)
-set (CMAKE_REQUIRED_INCLUDES)
+    set (CMAKE_REQUIRED_INCLUDES sys/time.h)
+    check_function_exists (gethrtime HAVE_GETHRTIME)
+    set (CMAKE_REQUIRED_INCLUDES)
 
-set (CMAKE_REQUIRED_INCLUDES stdlib.h)
-check_function_exists (mkdtemp HAVE_MKDTEMP)
-set (CMAKE_REQUIRED_INCLUDES)
+    set (CMAKE_REQUIRED_INCLUDES stdlib.h)
+    check_function_exists (mkdtemp HAVE_MKDTEMP)
+    set (CMAKE_REQUIRED_INCLUDES)
 
-set (CMAKE_REQUIRED_INCLUDES sys/socket.h)
-check_function_exists (accept4 HAVE_ACCEPT4)
-set (CMAKE_REQUIRED_INCLUDES)
+    set (CMAKE_REQUIRED_INCLUDES sys/socket.h)
+    check_function_exists (accept4 HAVE_ACCEPT4)
+    set (CMAKE_REQUIRED_INCLUDES)
+endif()
 
 add_definitions (-D_REENTRANT -D_THREAD_SAFE)
 add_definitions (-DZMQ_CUSTOM_PLATFORM_HPP)
@@ -314,14 +319,15 @@ if (CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   zmq_check_cxx_flag_prepend ("-Wextra")
 endif ()
 
-#   TODO: why is -Wno-long-long defined differently than in configure.ac?
-zmq_check_cxx_flag_prepend ("-Wno-long-long")
-zmq_check_cxx_flag_prepend ("-Wno-uninitialized")
-
 option (LIBZMQ_PEDANTIC "" ON)
 option (LIBZMQ_WERROR "" OFF)
 
-if (LIBZMQ_PEDANTIC)
+#   TODO: why is -Wno-long-long defined differently than in configure.ac?
+if (NOT MSVC)
+    zmq_check_cxx_flag_prepend ("-Wno-long-long")
+    zmq_check_cxx_flag_prepend ("-Wno-uninitialized")
+
+    if (LIBZMQ_PEDANTIC)
       zmq_check_cxx_flag_prepend ("-pedantic")
 
       if (${CMAKE_CXX_COMPILER_ID} MATCHES "Intel")
@@ -331,14 +337,18 @@ if (LIBZMQ_PEDANTIC)
       if (${CMAKE_CXX_COMPILER_ID} MATCHES "SunPro")
         zmq_check_cxx_flag_prepend ("-compat=5")
       endif ()
-endif ()
+    endif ()
+endif()
 
 if (LIBZMQ_WERROR)
-  zmq_check_cxx_flag_prepend ("-Werror")
+    if(MSVC)
         zmq_check_cxx_flag_prepend ("/WX")
+    else()
+        zmq_check_cxx_flag_prepend ("-Werror")
         if (NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
             zmq_check_cxx_flag_prepend ("-errwarn=%all")
         endif()
+    endif()
 endif ()
 
 if (CMAKE_SYSTEM_PROCESSOR MATCHES "^sparc")
@@ -372,7 +382,7 @@ endif ()
 
 
 #-----------------------------------------------------------------------------
-if (NOT CMAKE_CROSSCOMPILING)
+if (NOT CMAKE_CROSSCOMPILING AND NOT MSVC)
   zmq_check_sock_cloexec ()
   zmq_check_o_cloexec ()
   zmq_check_so_bindtodevice ()