Selective build of shared/static library (issue #27).

CMakeLists.txt

@@ -89,56 +89,89 @@ IF(UNIX AND NOT APPLE AND NOT CMAKE_CROSSCOMPILING AND NOT EXISTS "/etc/debian_v
 ENDIF()
 
 # Shared library
-ADD_LIBRARY(
+OPTION(
+	VMIME_BUILD_SHARED_LIBRARY
+	"Build shared library"
+	ON
+)
+
+IF(VMIME_BUILD_SHARED_LIBRARY)
+
+	ADD_LIBRARY(
 		${VMIME_LIBRARY_NAME}
 		SHARED
 		${VMIME_LIBRARY_SRC_FILES}
 		${VMIME_LIBRARY_INCLUDE_FILES}
-)
+	)
 
-SET_TARGET_PROPERTIES(
+	SET_TARGET_PROPERTIES(
 		${VMIME_LIBRARY_NAME}
 		PROPERTIES
 		VERSION    "${VMIME_VERSION}"
 		SOVERSION  "${VMIME_API_VERSION}"
-)
+	)
+
+ENDIF()
 
 # Static library
 #
 # Note: cannot have two targets with the same name so the static version has
 # '-static' appended and then the name of the output file is set separately.
-ADD_LIBRARY(
+OPTION(
+	VMIME_BUILD_STATIC_LIBRARY
+	"Build static library"
+	ON
+)
+
+IF(VMIME_BUILD_STATIC_LIBRARY)
+
+	ADD_LIBRARY(
 		${VMIME_LIBRARY_NAME}-static
 		STATIC
 		${VMIME_LIBRARY_SRC_FILES}
 		${VMIME_LIBRARY_INCLUDE_FILES}
-)
+	)
 
-SET_TARGET_PROPERTIES(
+	SET_TARGET_PROPERTIES(
 		${VMIME_LIBRARY_NAME}-static
 		PROPERTIES
 		OUTPUT_NAME  ${VMIME_LIBRARY_NAME}
-)
+	)
+
+ENDIF()
+
+# Ensure at least one type of library (either shared or static) is build
+IF(NOT(VMIME_BUILD_SHARED_LIBRARY OR VMIME_BUILD_STATIC_LIBRARY))
+	MESSAGE(FATAL_ERROR "You should select at least one library to build (either VMIME_BUILD_SHARED_LIBRARY or VMIME_BUILD_STATIC_LIBRARY must be set to YES.")
+ENDIF()
 
 # These next two lines are required but it is unclear exactly what they do.
 # The CMake FAQ mentions they are necessary and it does not work otherwise.
-SET_TARGET_PROPERTIES(${VMIME_LIBRARY_NAME} PROPERTIES CLEAN_DIRECT_OUTPUT 1)
+IF(VMIME_BUILD_SHARED_LIBRARY)
-SET_TARGET_PROPERTIES(${VMIME_LIBRARY_NAME}-static PROPERTIES CLEAN_DIRECT_OUTPUT 1)
+	SET_TARGET_PROPERTIES(${VMIME_LIBRARY_NAME} PROPERTIES CLEAN_DIRECT_OUTPUT 1)
+ENDIF()
+IF(VMIME_BUILD_STATIC_LIBRARY)
+	SET_TARGET_PROPERTIES(${VMIME_LIBRARY_NAME}-static PROPERTIES CLEAN_DIRECT_OUTPUT 1)
+ENDIF()
 
 SET(CMAKE_INSTALL_LIBDIR lib CACHE PATH "Output directory for libraries")
 
 # Installation of libraries
-INSTALL(
+IF(VMIME_BUILD_SHARED_LIBRARY)
+	INSTALL(
 		TARGETS ${VMIME_LIBRARY_NAME}
 		LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT sharedlibs
 		ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT sharedlibs
-)
+	)
+ENDIF()
 
-INSTALL(
+IF(VMIME_BUILD_STATIC_LIBRARY)
+	INSTALL(
 		TARGETS ${VMIME_LIBRARY_NAME}-static
 		LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT staticlibs
 		ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT staticlibs
-)
+	)
+ENDIF()
 
 # Installation of header files
 INSTALL_HEADERS_WITH_DIRECTORY(VMIME_LIBRARY_INCLUDE_FILES headers)
@@ -440,11 +473,13 @@ IF(VMIME_HAVE_SASL_SUPPORT)
 		${GSASL_INCLUDE_DIR}
 	)
 
+	IF(VMIME_BUILD_SHARED_LIBRARY)
 		TARGET_LINK_LIBRARIES(
 			${VMIME_LIBRARY_NAME}
 			${TARGET_LINK_LIBRARIES}
 			${GSASL_LIBRARIES}
 		)
+	ENDIF()
 
 	SET(VMIME_PKGCONFIG_LIBS "${VMIME_PKGCONFIG_LIBS} ${GSASL_LIBRARIES}")
 	SET(VMIME_PKGCONFIG_CFLAGS "${VMIME_PKGCONFIG_CFLAGS} ${GSASL_INCLUDE_DIR}")
@@ -495,11 +530,13 @@ IF(VMIME_HAVE_TLS_SUPPORT)
 			${GNUTLS_LIBRARY_DIRS}
 		)
 
+		IF(VMIME_BUILD_SHARED_LIBRARY)
 			TARGET_LINK_LIBRARIES(
 				${VMIME_LIBRARY_NAME}
 				${TARGET_LINK_LIBRARIES}
 				${GNUTLS_LIBRARY}
 			)
+		ENDIF()
 
 		SET(VMIME_PKGCONFIG_LIBS "${VMIME_PKGCONFIG_LIBS} ${GNUTLS_LIBRARY_DIRS} ${GNUTLS_LIBRARY}")
 		SET(VMIME_PKGCONFIG_CFLAGS "${VMIME_PKGCONFIG_CFLAGS} ${GNUTLS_INCLUDE_DIR}")
@@ -512,11 +549,13 @@ IF(VMIME_HAVE_TLS_SUPPORT)
 			${OPENSSL_INCLUDE_DIR}
 		)
 
+		IF(VMIME_BUILD_SHARED_LIBRARY)
 			TARGET_LINK_LIBRARIES(
 				${VMIME_LIBRARY_NAME}
 				${TARGET_LINK_LIBRARIES}
 				${OPENSSL_LIBRARIES}
 			)
+		ENDIF()
 
 		SET(VMIME_PKGCONFIG_LIBS "${VMIME_PKGCONFIG_LIBS} ${OPENSSL_LIBRARIES}")
 		SET(VMIME_PKGCONFIG_CFLAGS "${VMIME_PKGCONFIG_CFLAGS} ${OPENSSL_INCLUDE_DIR}")
@@ -541,11 +580,13 @@ INCLUDE_DIRECTORIES(
 	${ICONV_INCLUDE_DIR}
 )
 
-TARGET_LINK_LIBRARIES(
+IF(VMIME_BUILD_SHARED_LIBRARY)
+	TARGET_LINK_LIBRARIES(
 		${VMIME_LIBRARY_NAME}
 		${TARGET_LINK_LIBRARIES}
 		${ICONV_LIBRARIES}
-)
+	)
+ENDIF()
 
 
 ##############################################################################
@@ -580,12 +621,14 @@ IF(WIN32)
 	CHECK_LIBRARY_EXISTS("ws2_32" getch "${CMAKE_LIBRARY_PATH}" VMIME_HAVE_LIBWS2_32)
 
 	IF(VMIME_HAVE_LIBWS2_32)
+		IF(VMIME_BUILD_SHARED_LIBRARY)
 			TARGET_LINK_LIBRARIES(
 				${VMIME_LIBRARY_NAME}
 				${TARGET_LINK_LIBRARIES}
 				"ws2_32"
 			)
 		ENDIF()
+	ENDIF()
 
 	# MLang
 	CHECK_INCLUDE_FILES(Mlang.h VMIME_HAVE_MLANG_H)
@@ -595,6 +638,7 @@ IF(WIN32)
 		IF(VMIME_HAVE_MLANG_LIB)
 			SET(VMIME_HAVE_MLANG ON)
 
+			IF(VMIME_BUILD_SHARED_LIBRARY)
 				TARGET_LINK_LIBRARIES(
 					${VMIME_LIBRARY_NAME}
 					${TARGET_LINK_LIBRARIES}
@@ -602,6 +646,7 @@ IF(WIN32)
 				)
 			ENDIF()
 		ENDIF()
+	ENDIF()
 
 ENDIF()
 
@@ -618,21 +663,26 @@ CHECK_SYMBOL_EXISTS(SYS_gettid sys/syscall.h VMIME_HAVE_SYSCALL_GETTID)
 
 FIND_PACKAGE(Threads)
 
-TARGET_LINK_LIBRARIES(
+IF(VMIME_BUILD_SHARED_LIBRARY)
+	TARGET_LINK_LIBRARIES(
 		${VMIME_LIBRARY_NAME}
 		${TARGET_LINK_LIBRARIES}
 		${CMAKE_THREAD_LIBS_INIT}
-)
+	)
+ENDIF()
 
 FIND_LIBRARY(PTHREAD_LIB pthread)
 
 IF(PTHREAD_LIB)
 	SET(VMIME_HAVE_PTHREAD 1)
+
+	IF(VMIME_BUILD_SHARED_LIBRARY)
 		TARGET_LINK_LIBRARIES(
 			${VMIME_LIBRARY_NAME}
 			${TARGET_LINK_LIBRARIES}
 			${PTHREAD_LIB}
 		)
+	ENDIF()
 ELSE(PTHREAD_LIB)
 	SET(VMIME_HAVE_PTHREAD 0)
 ENDIF(PTHREAD_LIB)