Merge pull request #1274 from paullouisageneau/cmake-build-shared-lib…

…raries

CMake: Comply with BUILD_SHARED_LIBS option

.github/workflows/build-nomedia.yml

@@ -36,5 +36,7 @@ jobs:
         set CL=/MP
         nmake
     - name: test
-      run: build/tests.exe
+      run: |
+        cd build
+        ./tests
 

.github/workflows/build-openssl.yml

@@ -52,5 +52,7 @@ jobs:
         set CL=/MP
         nmake
     - name: test
-      run: build/tests.exe
+      run: |
+        cd build
+        ./tests
 

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.7)
+cmake_minimum_required(VERSION 3.13)
 project(libdatachannel
 	VERSION 0.21.2
 	LANGUAGES CXX)
@@ -7,10 +7,12 @@ set(PROJECT_DESCRIPTION "C/C++ WebRTC network library featuring Data Channels, M
 include(GNUInstallDirs)
 
 # Options
+option(BUILD_SHARED_LIBS "Build shared library" ON)
+option(BUILD_SHARED_DEPS_LIBS "Build submodules as shared libraries" OFF)
 option(USE_GNUTLS "Use GnuTLS instead of OpenSSL" OFF)
 option(USE_MBEDTLS "Use Mbed TLS instead of OpenSSL" OFF)
 option(USE_NICE "Use libnice instead of libjuice" OFF)
-option(PREFER_SYSTEM_LIB "Prefer system libraries over deps folder" OFF)
+option(PREFER_SYSTEM_LIB "Prefer system libraries over submodules" OFF)
 option(USE_SYSTEM_SRTP "Use system libSRTP" ${PREFER_SYSTEM_LIB})
 option(USE_SYSTEM_JUICE "Use system libjuice" ${PREFER_SYSTEM_LIB})
 option(USE_SYSTEM_USRSCTP "Use system libusrsctp" ${PREFER_SYSTEM_LIB})
@@ -49,7 +51,6 @@ endif()
 
 list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/Modules)
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
-set(BUILD_SHARED_LIBS OFF) # to force usrsctp to be built static
 
 if(WIN32)
 	add_definitions(-DWIN32_LEAN_AND_MEAN)
@@ -230,45 +231,14 @@ set(BENCHMARK_UWP_RESOURCES
 	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/benchmark/Windows_TemporaryKey.pfx
 )
 
-set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
-set(THREADS_PREFER_PTHREAD_FLAG TRUE)
-find_package(Threads REQUIRED)
-
-if(USE_SYSTEM_PLOG)
-	find_package(plog REQUIRED)
-else()
-	set(CMAKE_POLICY_DEFAULT_CMP0048 NEW)
-	add_subdirectory(deps/plog EXCLUDE_FROM_ALL)
-endif()
-
-if(SCTP_DEBUG)
-	add_definitions(-DSCTP_DEBUG)
-endif()
-
-if(USE_SYSTEM_USRSCTP)
-	find_package(Usrsctp REQUIRED)
-else()
-	option(sctp_build_shared_lib OFF)
-	option(sctp_build_programs OFF)
-	option(sctp_inet OFF)
-	option(sctp_inet6 OFF)
-	option(sctp_werror OFF)
-	set(CMAKE_POLICY_DEFAULT_CMP0077 NEW)
-	add_subdirectory(deps/usrsctp EXCLUDE_FROM_ALL)
-	if (MSYS OR MINGW)
-		target_compile_definitions(usrsctp PUBLIC -DSCTP_STDINT_INCLUDE=<stdint.h>)
-	endif()
-	add_library(Usrsctp::Usrsctp ALIAS usrsctp)
-endif()
-
 if(RTC_UPDATE_VERSION_HEADER)
 	configure_file (
 		${PROJECT_SOURCE_DIR}/cmake/version.h.in
 		${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/version.h
 	)
 endif()
 
-add_library(datachannel SHARED
+add_library(datachannel
 	${LIBDATACHANNEL_SOURCES}
 	${LIBDATACHANNEL_HEADERS}
 	${LIBDATACHANNEL_IMPL_SOURCES}
@@ -278,15 +248,12 @@ set_target_properties(datachannel PROPERTIES
 	SOVERSION ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
 	CXX_STANDARD 17
 	CXX_VISIBILITY_PRESET default)
-
 if(APPLE)
 	set_target_properties(datachannel PROPERTIES
 		VERSION ${PROJECT_VERSION_MAJOR}
 		SOVERSION ${PROJECT_VERSION_MAJOR})
 endif()
 
-target_compile_definitions(datachannel PRIVATE RTC_EXPORTS)
-
 add_library(datachannel-static STATIC EXCLUDE_FROM_ALL
 	${LIBDATACHANNEL_SOURCES}
 	${LIBDATACHANNEL_HEADERS}
@@ -295,24 +262,84 @@ add_library(datachannel-static STATIC EXCLUDE_FROM_ALL
 set_target_properties(datachannel-static PROPERTIES
 	VERSION ${PROJECT_VERSION}
 	CXX_STANDARD 17)
+
+target_compile_definitions(datachannel PRIVATE RTC_EXPORTS)
+if (NOT BUILD_SHARED_LIBS)
+	target_compile_definitions(datachannel PUBLIC RTC_STATIC)
+endif()
 target_compile_definitions(datachannel-static PRIVATE RTC_EXPORTS)
 target_compile_definitions(datachannel-static PUBLIC RTC_STATIC)
 
+if(NOT BUILD_SHARED_DEPS_LIBS)
+	set(BUILD_SHARED_LIBS OFF)
+endif()
+
+set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
+set(THREADS_PREFER_PTHREAD_FLAG TRUE)
+find_package(Threads REQUIRED)
+
+if(USE_SYSTEM_PLOG)
+	find_package(plog REQUIRED)
+else()
+	set(CMAKE_POLICY_DEFAULT_CMP0048 NEW)
+	add_subdirectory(deps/plog EXCLUDE_FROM_ALL)
+endif()
+
+if(SCTP_DEBUG)
+	add_definitions(-DSCTP_DEBUG)
+endif()
+
+if(USE_SYSTEM_USRSCTP)
+	find_package(Usrsctp REQUIRED)
+else()
+	option(sctp_build_shared_lib OFF)
+	option(sctp_build_programs OFF)
+	option(sctp_inet OFF)
+	option(sctp_inet6 OFF)
+	option(sctp_werror OFF)
+	set(CMAKE_POLICY_DEFAULT_CMP0077 NEW)
+	add_subdirectory(deps/usrsctp EXCLUDE_FROM_ALL)
+	if (MSYS OR MINGW)
+		target_compile_definitions(usrsctp PUBLIC -DSCTP_STDINT_INCLUDE=<stdint.h>)
+	endif()
+	add_library(Usrsctp::Usrsctp ALIAS usrsctp)
+
+	# usrsctp lacks an export set
+	install(TARGETS usrsctp EXPORT UsrsctpTargets)
+	install(EXPORT UsrsctpTargets
+			FILE UsrsctpTargets.cmake
+			NAMESPACE Usrsctp::
+			DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/usrsctp
+			EXCLUDE_FROM_ALL)
+
+	# Fix directories
+	set_target_properties(usrsctp PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "")
+	target_include_directories(usrsctp INTERFACE
+		$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/deps/usrsctp/usrsctplib>
+		$<INSTALL_INTERFACE:>)
+endif()
+
 target_include_directories(datachannel PUBLIC
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
     $<INSTALL_INTERFACE:include>)
-target_include_directories(datachannel PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include/rtc)
-target_include_directories(datachannel PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
-target_link_libraries(datachannel PRIVATE Threads::Threads)
-target_link_libraries(datachannel PRIVATE Usrsctp::Usrsctp plog::plog)
+target_include_directories(datachannel PRIVATE
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc
+	${CMAKE_CURRENT_SOURCE_DIR}/src)
+target_link_libraries(datachannel PRIVATE
+	Threads::Threads
+	Usrsctp::Usrsctp
+	$<BUILD_INTERFACE:plog::plog>)
 
 target_include_directories(datachannel-static PUBLIC
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
     $<INSTALL_INTERFACE:include>)
-target_include_directories(datachannel-static PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include/rtc)
-target_include_directories(datachannel-static PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
-target_link_libraries(datachannel-static PRIVATE Threads::Threads)
-target_link_libraries(datachannel-static PRIVATE Usrsctp::Usrsctp plog::plog)
+target_include_directories(datachannel-static PRIVATE
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc
+	${CMAKE_CURRENT_SOURCE_DIR}/src)
+target_link_libraries(datachannel-static PRIVATE
+	Threads::Threads
+	Usrsctp::Usrsctp
+	$<BUILD_INTERFACE:plog::plog>)
 
 if(WIN32)
 	target_link_libraries(datachannel PUBLIC ws2_32) # winsock2
@@ -349,6 +376,7 @@ else()
 	else()
 		if(NOT TARGET srtp2)
 			add_subdirectory(deps/libsrtp EXCLUDE_FROM_ALL)
+			install(TARGETS srtp2)
 		endif()
 		target_compile_definitions(datachannel PRIVATE RTC_SYSTEM_SRTP=0)
 		target_compile_definitions(datachannel-static PRIVATE RTC_SYSTEM_SRTP=0)
@@ -426,9 +454,10 @@ else()
 		target_link_libraries(datachannel-static PRIVATE LibJuice::LibJuice)
 	else()
 		add_subdirectory(deps/libjuice EXCLUDE_FROM_ALL)
+		install(TARGETS juice)
 		target_compile_definitions(datachannel PRIVATE RTC_SYSTEM_JUICE=0)
 		target_compile_definitions(datachannel-static PRIVATE RTC_SYSTEM_JUICE=0)
-		target_link_libraries(datachannel PRIVATE LibJuice::LibJuiceStatic)
+		target_link_libraries(datachannel PRIVATE LibJuice::LibJuice)
 		target_link_libraries(datachannel-static PRIVATE LibJuice::LibJuiceStatic)
 	endif()
 endif()