Fix build issues for musl libc (#267)

Change-Id: Ia31330b0f96669966712b58986abeca754c2cbb9

runtime/hsa-ext-finalize/CMakeLists.txt

@@ -101,6 +101,18 @@ if( NOT DEFINED OPEN_SOURCE_DIR )
   set ( OPEN_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/.." )
 endif()
 
+## Check for _GNU_SOURCE pthread extensions
+set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
+CHECK_SYMBOL_EXISTS ( "pthread_attr_setaffinity_np" "pthread.h" HAVE_PTHREAD_ATTR_SETAFFINITY_NP )
+CHECK_SYMBOL_EXISTS ( "pthread_rwlockattr_setkind_np" "pthread.h" HAVE_PTHREAD_RWLOCKATTR_SETKIND_NP )
+unset(CMAKE_REQUIRED_DEFINITIONS)
+if ( HAVE_PTHREAD_ATTR_SETAFFINITY_NP )
+  target_compile_definitions(${CORE_RUNTIME_TARGET} PRIVATE HAVE_PTHREAD_ATTR_SETAFFINITY_NP )
+endif()
+if ( HAVE_PTHREAD_RWLOCKATTR_SETKIND_NP )
+  target_compile_definitions(${CORE_RUNTIME_TARGET} PRIVATE HAVE_PTHREAD_RWLOCKATTR_SETKIND_NP )
+endif()
+
 ## ------------------------- Linux Compiler and Linker options -------------------------
 set ( CMAKE_CXX_FLAGS "-std=c++11 " )