Add static library to CMake build

Signed-off-by: Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com>

CMakeLists.txt

@@ -34,6 +34,7 @@ STRING(STRIP ${BUILD_TIMESTAMP} BUILD_TIMESTAMP)
 
 ## build options
 SET(PAHO_WITH_SSL FALSE CACHE BOOL "Flag that defines whether to build ssl-enabled binaries too. ")
+SET(PAHO_BUILD_STATIC FALSE CACHE BOOL "Build static library")
 SET(PAHO_BUILD_DOCUMENTATION FALSE CACHE BOOL "Create and install the HTML based API documentation (requires Doxygen)")
 SET(PAHO_BUILD_SAMPLES FALSE CACHE BOOL "Build sample programs")
 

README.md

@@ -36,6 +36,7 @@ Before compiling, determine the value of some variables in order to configure fe
 
 Variable | Default Value | Description
 ------------ | ------------- | -------------
+PAHO_BUILD_STATIC | FALSE | Build a static version of the libraries
 PAHO_WITH_SSL | FALSE | Flag that defines whether to build ssl-enabled binaries too. 
 OPENSSL_INC_SEARCH_PATH | "" (system default) | Directory containing OpenSSL includes
 OPENSSL_LIB_SEARCH_PATH | "" (system default) | Directory containing OpenSSL libraries
@@ -125,6 +126,8 @@ The Paho C client comprises four shared libraries:
  * libmqttv3c.so - "classic" / synchronous
  * libmqttv3cs.so - "classic" / synchronous with SSL
 
+Optionally, you can build static version of those libraries.
+
 ## Usage and API
 
 Detailed API documentation is available by building the Doxygen docs in the  ``doc`` directory. A [snapshot is also available online](http://www.eclipse.org/paho/files/mqttdoc/Cclient/index.html).

src/CMakeLists.txt

@@ -76,6 +76,22 @@ INSTALL(TARGETS paho-mqtt3c paho-mqtt3a
     LIBRARY DESTINATION lib)
 INSTALL(TARGETS MQTTVersion
     RUNTIME DESTINATION bin)
+
+IF (PAHO_BUILD_STATIC)
+    ADD_LIBRARY(paho-mqtt3c-static STATIC $<TARGET_OBJECTS:common_obj> MQTTClient.c)
+    ADD_LIBRARY(paho-mqtt3a-static STATIC $<TARGET_OBJECTS:common_obj> MQTTAsync.c)
+
+    TARGET_LINK_LIBRARIES(paho-mqtt3c-static ${LIBS_SYSTEM})
+    TARGET_LINK_LIBRARIES(paho-mqtt3a-static ${LIBS_SYSTEM})
+
+    INSTALL(TARGETS paho-mqtt3c-static
+        ARCHIVE DESTINATION lib
+        LIBRARY DESTINATION lib)
+    INSTALL(TARGETS paho-mqtt3a-static
+        ARCHIVE DESTINATION lib
+        LIBRARY DESTINATION lib)
+ENDIF()
+
 INSTALL(FILES MQTTAsync.h MQTTClient.h MQTTClientPersistence.h
     DESTINATION include)
 
@@ -107,5 +123,21 @@ IF (PAHO_WITH_SSL)
     INSTALL(TARGETS paho-mqtt3as
         ARCHIVE DESTINATION lib
         LIBRARY DESTINATION lib)
+
+    IF (PAHO_BUILD_STATIC)
+        ADD_LIBRARY(paho-mqtt3cs-static STATIC $<TARGET_OBJECTS:common_ssl_obj> MQTTClient.c SSLSocket.c)
+        ADD_LIBRARY(paho-mqtt3as-static STATIC $<TARGET_OBJECTS:common_ssl_obj> MQTTAsync.c SSLSocket.c)
+
+        TARGET_LINK_LIBRARIES(paho-mqtt3cs-static ${OPENSSL_LIBRARIES} ${LIBS_SYSTEM})
+        TARGET_LINK_LIBRARIES(paho-mqtt3as-static ${OPENSSL_LIBRARIES} ${LIBS_SYSTEM})
+
+        INSTALL(TARGETS paho-mqtt3cs-static
+            ARCHIVE DESTINATION lib
+            LIBRARY DESTINATION lib)
+        INSTALL(TARGETS paho-mqtt3as-static
+            ARCHIVE DESTINATION lib
+            LIBRARY DESTINATION lib)
+    ENDIF()
+
 ENDIF()