Merge pull request #2204 from skliper/fix2120-clang_support

Fix #2120, Support clang for whole archive flags

cmake/sample_defs/toolchain-i686-linux-clang.cmake

@@ -0,0 +1,23 @@
+# This example toolchain file describes the cross compiler to use for
+# the target architecture indicated in the configuration file.
+
+# Basic cross system configuration
+SET(CMAKE_SYSTEM_NAME           Linux)
+SET(CMAKE_SYSTEM_VERSION        1)
+SET(CMAKE_SYSTEM_PROCESSOR      i686)
+
+# Specify the cross compiler executables
+# Typically these would be installed in a home directory or somewhere
+# in /opt.  However in this example the system compiler is used.
+SET(CMAKE_C_COMPILER            "/usr/bin/clang")
+SET(CMAKE_CXX_COMPILER          "/usr/bin/clang++")
+
+# Configure the find commands
+SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM   NEVER)
+SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY   NEVER)
+SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE   NEVER)
+
+# These variable settings are specific to cFE/OSAL and determines which 
+# abstraction layers are built when using this toolchain
+SET(CFE_SYSTEM_PSPNAME      "pc-linux")
+SET(OSAL_SYSTEM_OSTYPE      "posix")

cmake/target/CMakeLists.txt

@@ -156,7 +156,7 @@ if (${TGTNAME}_APPLIST)
 
   set_target_properties(core-${TGTNAME} PROPERTIES ENABLE_EXPORTS TRUE)
 
-  if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
+  if (("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU") OR ("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang"))
     # The option pair for GNU gcc/ld tools
     set(START_WHOLE_ARCHIVE "--whole-archive")
     set(STOP_WHOLE_ARCHIVE  "--no-whole-archive")
@@ -165,6 +165,7 @@ if (${TGTNAME}_APPLIST)
     set(COMPILER_LINKER_OPTION_PREFIX "-Wl,")
   else()
     # Other toolchain options may be added here
+    message(WARNING "Unmatched compiler id, WHOLE_ARCHIVE flags not automatically set and may need custom config")
   endif()
 
   # Determine if a pass-through prefix is needed for a linker option.