Fix mosquitto_pub -l if compiled using cmake.

Since dde005ef92 mosquito_pub is throwing error
that 'threading support has not been compiled' when compiled using cmake.
It looks like WITH_THREADING flag is not set at top level Makefile and used
only in lib/ directory, so library is correctly compiled with threading.
But for client this flag is undefined, so it gives error on '-l' option.

This commit moves part related to WITH_THREADING flag out of lib/CMakeLists.txt
to top levele CMakeLists.txt, so it could be accessible to all subdirectories.

Signed-off-by: Marek Wodzinski <majek@w7i.pl>

CMakeLists.txt

@@ -73,6 +73,30 @@ endif (${WITH_SOCKS} STREQUAL ON)
 
 option(WITH_SRV "Include SRV lookup support?" OFF)
 
+option(WITH_THREADING "Include client library threading support?" ON)
+if (${WITH_THREADING} STREQUAL ON)
+	add_definitions("-DWITH_THREADING")
+	if (WIN32)
+		if (CMAKE_CL_64)
+			set (PTHREAD_LIBRARIES C:\\pthreads\\Pre-built.2\\lib\\x64\\pthreadVC2.lib)
+		else (CMAKE_CL_64)
+			set (PTHREAD_LIBRARIES C:\\pthreads\\Pre-built.2\\lib\\x86\\pthreadVC2.lib)
+		endif (CMAKE_CL_64)
+		set (PTHREAD_INCLUDE_DIR C:\\pthreads\\Pre-built.2\\include)
+	else (WIN32)
+		find_library(LIBPTHREAD pthread)
+		if (LIBPTHREAD)
+			set (PTHREAD_LIBRARIES pthread)
+		else (LIBPTHREAD)
+			set (PTHREAD_LIBRARIES "")
+		endif()
+		set (PTHREAD_INCLUDE_DIR "")
+	endif (WIN32)
+else (${WITH_THREADING} STREQUAL ON)
+	set (PTHREAD_LIBRARIES "")
+	set (PTHREAD_INCLUDE_DIR "")
+endif (${WITH_THREADING} STREQUAL ON)
+
 option(DOCUMENTATION "Build documentation?" ON)
 
 # ========================================

ChangeLog.txt

@@ -5,6 +5,9 @@ Library:
 - Fix memory leak that occurred if mosquitto_reconnect() was used when TLS
 errors were present. Closes #592.
 
+Build:
+- Fix clients not being compiled with threading support when using CMake.
+  Closes #983.
 
 1.5.3 - 20180925
 ================

client/CMakeLists.txt

@@ -1,5 +1,5 @@
 include_directories(${mosquitto_SOURCE_DIR} ${mosquitto_SOURCE_DIR}/lib
-			${STDBOOL_H_PATH} ${STDINT_H_PATH})
+			${STDBOOL_H_PATH} ${STDINT_H_PATH} ${PTHREAD_INCLUDE_DIR})
 link_directories(${mosquitto_BINARY_DIR}/lib)
 
 set(shared_src client_shared.c client_shared.h)

lib/CMakeLists.txt

@@ -2,30 +2,6 @@ option(WITH_STATIC_LIBRARIES "Build static versions of the libmosquitto/pp libra
 option(WITH_PIC "Build the static library with PIC (Position Independent Code) enabled archives?" OFF)
 add_subdirectory(cpp)
 
-option(WITH_THREADING "Include client library threading support?" ON)
-if (${WITH_THREADING} STREQUAL ON)
-	add_definitions("-DWITH_THREADING")
-	if (WIN32)
-		if (CMAKE_CL_64)
-			set (PTHREAD_LIBRARIES C:\\pthreads\\Pre-built.2\\lib\\x64\\pthreadVC2.lib)
-		else (CMAKE_CL_64)
-			set (PTHREAD_LIBRARIES C:\\pthreads\\Pre-built.2\\lib\\x86\\pthreadVC2.lib)
-		endif (CMAKE_CL_64)
-		set (PTHREAD_INCLUDE_DIR C:\\pthreads\\Pre-built.2\\include)
-	else (WIN32)
-		find_library(LIBPTHREAD pthread)
-		if (LIBPTHREAD)
-			set (PTHREAD_LIBRARIES pthread)
-		else (LIBPTHREAD)
-			set (PTHREAD_LIBRARIES "")
-		endif()
-		set (PTHREAD_INCLUDE_DIR "")
-	endif (WIN32)
-else (${WITH_THREADING} STREQUAL ON)
-	set (PTHREAD_LIBRARIES "")
-	set (PTHREAD_INCLUDE_DIR "")
-endif (${WITH_THREADING} STREQUAL ON)
-
 include_directories(${mosquitto_SOURCE_DIR} ${mosquitto_SOURCE_DIR}/lib
 			${STDBOOL_H_PATH} ${STDINT_H_PATH}
 			${OPENSSL_INCLUDE_DIR} ${PTHREAD_INCLUDE_DIR})