chore: Add the possibility to install dev headers

The library should provide the possibility to install development
headers. This patch adds this option by splitting sources and headers in
the CMakeLists file, allowing to install the headers separately.

Signed-off-by: Robert-André Mauchin <zebob.m@gmail.com>

Author: Robert-André Mauchin

CMakeLists.txt

@@ -11,6 +11,9 @@ MESSAGE(STATUS "FTL DISABLE_FTL_APP: " ${DISABLE_FTL_APP})
 option(FTL_STATIC_COMPILE "Set to TRUE if you want ftl to be compiled as a static lib. If TRUE, the program will want to statically link to the ftl cmake object." FALSE)
 MESSAGE(STATUS "FTL FTL_STATIC_COMPILE: " ${FTL_STATIC_COMPILE})
 
+option(FTL_INSTALL_INCLUDES "Set to TRUE if you want development headers to be installed." FALSE)
+MESSAGE(STATUS "FTL FTL_INSTALL_INCLUDES: " ${FTL_INSTALL_INCLUDES})
+
 find_package(Threads REQUIRED)
 
 set (CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
@@ -57,17 +60,18 @@ if (WIN32)
                           ftl_app/win32/ctrlc_handler.c)
   #set(FTL_PLATFORM_LIBS kernel32 user32 gdi32 advapi32 )
   #set(FTL_PLATFORM_LIBS ws2_32 )
-  set(FTLSDK_PLATFORM_FILES libftl/win32/socket.c
-                            libftl/win32/socket.h
-                            libftl/win32/threads.c
-                            libftl/win32/threads.h)
+  set(FTLSDK_PLATFORM_HEADERS libftl/win32/socket.h
+                              libftl/win32/threads.h)
+  set(FTLSDK_PLATFORM_SOURCES libftl/win32/socket.c
+                              libftl/win32/threads.c)
   include_directories(libftl/win32)
 else()
   set(FTL_PLATFORM_FILES ftl_app/posix/ctrlc_handler.c)
-  set(FTLSDK_PLATFORM_FILES libftl/posix/socket.c
-                            libftl/posix/socket.h
-                            libftl/posix/threads.c
-                            libftl/posix/threads.h)
+
+  set(FTLSDK_PLATFORM_HEADERS libftl/posix/socket.h
+                              libftl/posix/threads.h)
+  set(FTLSDK_PLATFORM_SOURCES libftl/posix/socket.c
+                              libftl/posix/threads.c)
   include_directories(libftl/posix)
 endif()
 
@@ -79,21 +83,33 @@ else(FTL_STATIC_COMPILE)
   set(FTL_LIB_TYPE SHARED)
 endif(FTL_STATIC_COMPILE)
 
-add_library(ftl ${FTL_LIB_TYPE} libftl/hmac/hmac.c
-                       libftl/hmac/hmac.h
-                       libftl/hmac/sha2.c
-                       libftl/hmac/sha2.h
-                       libftl/gettimeofday/gettimeofday.c
-                       libftl/gettimeofday/gettimeofday.h
-                       libftl/ftl-sdk.c
-                       libftl/handshake.c
-                       libftl/ingest.c
-                       libftl/ftl_helpers.c
-                       libftl/media.c
-                       libftl/logging.c
-                       libftl/ftl.h
-                       libftl/ftl_private.h
-                       ${FTLSDK_PLATFORM_FILES})
+set(FTL_HEADERS
+    libftl/ftl.h
+    libftl/ftl_private.h)
+
+set(FTL_HMAC_HEADERS
+    libftl/hmac/hmac.h
+    libftl/hmac/sha2.h)
+
+set(FTL_GETTIMEOFDAY_HEADERS
+    libftl/gettimeofday/gettimeofday.h)
+
+set(FTL_SOURCES
+    libftl/hmac/hmac.c
+    libftl/hmac/sha2.c
+    libftl/gettimeofday/gettimeofday.c
+    libftl/ftl-sdk.c
+    libftl/handshake.c
+    libftl/ingest.c
+    libftl/ftl_helpers.c
+    libftl/media.c
+    libftl/logging.c)
+
+add_library(ftl ${FTL_LIB_TYPE} ${FTL_HEADERS}
+                                ${FTL_HMAC_HEADERS}
+                                ${FTL_GETTIMEOFDAY_HEADERS}
+                                ${FTLSDK_PLATFORM_HEADERS}
+                                ${FTLSDK_PLATFORM_SOURCES})
 include_directories(libftl libftl/gettimeofday)
 
 set_target_properties(ftl PROPERTIES VERSION "0.5.0")
@@ -132,4 +148,19 @@ endif()
 
 # Install rules
 install(TARGETS ftl DESTINATION
-  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
+
+if (FTL_INSTALL_INCLUDES)
+foreach(ITEM ${FTL_HEADERS})
+  install(FILES ${ITEM} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/ftl)
+endforeach()
+foreach(ITEM ${FTL_HMAC_HEADERS})
+  install(FILES ${ITEM} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/ftl/hmac/)
+endforeach()
+foreach(ITEM ${FTL_GETTIMEOFDAY_HEADERS})
+  install(FILES ${ITEM} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/ftl/gettimeofday)
+endforeach()
+foreach(ITEM ${FTLSDK_PLATFORM_HEADERS})
+  install(FILES ${ITEM} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/ftl)
+endforeach()
+endif()