Conditionally resolve POSIX thread library to allow a more flexible linkage…

Conditionally resolve POSIX thread library to allow a more flexible linkage handling in systems that do not use pthreads
Signed-off-by: Otavio Rodolfo Piske <opiske@redhat.com>

src/CMakeLists.txt

@@ -53,13 +53,15 @@ ELSEIF (CMAKE_SYSTEM_NAME MATCHES "Linux")
     SET(LIBS_SYSTEM dl)
 ENDIF()
 
-
+IF (UNIX)
+    SET(THREAD_LIBS_SYSTEM pthread)
+ENDIF()
 
 ADD_EXECUTABLE(MQTTVersion MQTTVersion.c)
 ADD_LIBRARY(paho-mqtt3c SHARED ${common_src} MQTTClient.c)
 ADD_LIBRARY(paho-mqtt3a SHARED ${common_src} MQTTAsync.c)
-TARGET_LINK_LIBRARIES(paho-mqtt3c pthread ${LIBS_SYSTEM})
-TARGET_LINK_LIBRARIES(paho-mqtt3a pthread ${LIBS_SYSTEM})
+TARGET_LINK_LIBRARIES(paho-mqtt3c ${THREAD_LIBS_SYSTEM} ${LIBS_SYSTEM})
+TARGET_LINK_LIBRARIES(paho-mqtt3a ${THREAD_LIBS_SYSTEM} ${LIBS_SYSTEM})
 TARGET_LINK_LIBRARIES(MQTTVersion paho-mqtt3a paho-mqtt3c ${LIBS_SYSTEM})
 SET_TARGET_PROPERTIES(
     paho-mqtt3c paho-mqtt3a PROPERTIES
@@ -97,8 +99,8 @@ SET(OPENSSL_LIB_SEARCH_PATH "" CACHE PATH "Directory containing OpenSSL librarie
     ADD_LIBRARY(paho-mqtt3cs SHARED ${common_src} MQTTClient.c SSLSocket.c)
     ADD_LIBRARY(paho-mqtt3as SHARED ${common_src} MQTTAsync.c SSLSocket.c)
 
-    TARGET_LINK_LIBRARIES(paho-mqtt3cs pthread ${OPENSSL_LIB} ${OPENSSLCRYPTO_LIB} ${LIBS_SYSTEM})
-    TARGET_LINK_LIBRARIES(paho-mqtt3as pthread ${OPENSSL_LIB} ${OPENSSLCRYPTO_LIB} ${LIBS_SYSTEM})
+    TARGET_LINK_LIBRARIES(paho-mqtt3cs ${THREAD_LIBS_SYSTEM} ${OPENSSL_LIB} ${OPENSSLCRYPTO_LIB} ${LIBS_SYSTEM})
+    TARGET_LINK_LIBRARIES(paho-mqtt3as ${THREAD_LIBS_SYSTEM} ${OPENSSL_LIB} ${OPENSSLCRYPTO_LIB} ${LIBS_SYSTEM})
     SET_TARGET_PROPERTIES(
         paho-mqtt3cs paho-mqtt3as PROPERTIES
         VERSION ${CLIENT_VERSION}