allow to ignore try to link with staticcpp

CMakeLists.txt

@@ -5,6 +5,7 @@ project(v4l2rtspserver)
 option(COVERAGE "Coverage" OFF)
 
 set(ALSA ON CACHE BOOL "use ALSA if available")
+set(STATICSTDCPP ON CACHE BOOL "use gcc static lib if available")
 set(LOG4CPP OFF CACHE BOOL "use log4cpp if available")
 set(LIVE555URL http://www.live555.com/liveMedia/public/live555-latest.tar.gz CACHE STRING "live555 url")
 set(LIVE555CFLAGS -DBSD=1 -DSOCKLEN_T=socklen_t -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE=1 -DALLOW_RTSP_SERVER_PORT_REUSE=1 CACHE STRING "live555 CFGLAGS")
@@ -118,14 +119,16 @@ include_directories("libv4l2cpp/inc")
 target_link_libraries (${PROJECT_NAME} libv4l2cpp) 
 
 # static link of stdc++ if available
-include(CheckCXXCompilerFlag)
-CHECK_CXX_COMPILER_FLAG("-static-libgcc" CXX_SUPPORTS_STATIC_LIBGCC)
-if (CXX_SUPPORTS_STATIC_LIBGCC) 
-  target_link_libraries (${CMAKE_PROJECT_NAME} -static-libgcc)
-endif()    
-CHECK_CXX_COMPILER_FLAG("-static-libstdc++" CXX_SUPPORTS_STATIC_LIBSTDCPP)
-if (CXX_SUPPORTS_STATIC_LIBSTDCPP) 
-  target_link_libraries (${CMAKE_PROJECT_NAME} -static-libstdc++)
+if (STATICSTDCPP)
+  include(CheckCXXCompilerFlag)
+  CHECK_CXX_COMPILER_FLAG("-static-libgcc" CXX_SUPPORTS_STATIC_LIBGCC)
+  if (CXX_SUPPORTS_STATIC_LIBGCC) 
+    target_link_libraries (${CMAKE_PROJECT_NAME} -static-libgcc)
+  endif()    
+  CHECK_CXX_COMPILER_FLAG("-static-libstdc++" CXX_SUPPORTS_STATIC_LIBSTDCPP)
+  if (CXX_SUPPORTS_STATIC_LIBSTDCPP) 
+    target_link_libraries (${CMAKE_PROJECT_NAME} -static-libstdc++)
+  endif()
 endif()
 
 #testing