cmake: build shared libs by default on linux

The change allows to build shared libraries by default on Linux, while
respecting the requested library build type when the standard CMake flag
BUILD_SHARED_LIBS is defined.

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

CMakeLists.txt

@@ -10,6 +10,13 @@ set (LIB_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}" CACHE PATH "Installation path for
 # Set CMAKE_LIB_INSTALL_DIR if not defined
 include(GNUInstallDirs)
 
+# By default, build shared object libraries on linux
+if (UNIX AND NOT APPLE)
+  if (NOT DEFINED BUILD_SHARED_LIBS)
+    set(BUILD_SHARED_LIBS ON)
+  endif()
+endif()
+
 # Appends the cmake/modules path to MAKE_MODULE_PATH variable.
 set (CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules ${CMAKE_MODULE_PATH})
 

src/CMakeLists.txt

@@ -111,7 +111,7 @@ set (mraa_LIB_GLOB_HEADERS
   ${PROJECT_SOURCE_DIR}/api/mraa.hpp
 )
 
-add_library (mraa SHARED ${mraa_LIB_SRCS})
+add_library (mraa ${mraa_LIB_SRCS})
 
 
 target_link_libraries (mraa ${mraa_LIBS})