cmake: check for fallthrough attribute

CMakeLists.txt

@@ -503,13 +503,32 @@ else (NOT CHAMELEON_SIMULATION)
 
 endif(NOT CHAMELEON_SIMULATION)
 
-# getopt
+# Check for getopt
+# ----------------
 unset(CMAKE_REQUIRED_LIBRARIES)
 check_include_files(getopt.h CHAMELEON_HAVE_GETOPT_H)
 if (CHAMELEON_HAVE_GETOPT_H)
   check_function_exists(getopt_long CHAMELEON_HAVE_GETOPT_LONG)
 endif()
 
+# Check for attribute fallthrough
+# -------------------------------
+check_c_source_compiles("
+#include <stdarg.h>
+int main(void) {
+  int a = 2;
+  switch( a ){
+  case 0:
+     __attribute__((fallthrough));
+  default:
+      ;
+  }
+  return 0;
+}
+"
+  HAVE_FALLTHROUGH
+  )
+
 # Add option to exploit cublas API v2
 # -----------------------------------
 cmake_dependent_option(CHAMELEON_USE_CUBLAS_V2

include/chameleon/config.h.in

@@ -70,6 +70,13 @@
 /* chameleon runtime starpu */
 #cmakedefine CHAMELEON_ENABLE_PRUNING_STATS
 
+#cmakedefine HAVE_FALLTHROUGH
+#if defined(HAVE_FALLTHROUGH)
+#define chameleon_attr_fallthrough __attribute__((fallthrough))
+#else
+#define chameleon_attr_fallthrough do {} while(0)
+#endif
+
 #ifdef BEGIN_C_DECLS
 #undef BEGIN_C_DECLS
 #endif