ENH: no c++ comments in a c file

Tests/Complex/Executable/testcflags.c

@@ -1,12 +1,12 @@
 #include <string.h>
 int TestCFlags(char* m)
 {
-  // TEST_CXX_FLAGS should not be defined in a c file
+  /* TEST_CXX_FLAGS should not be defined in a c file */
 #ifdef TEST_CXX_FLAGS
   strcpy(m, "CMake CMAKE_CXX_FLAGS (TEST_CXX_FLAGS) found in c file.");
   return 0;
 #endif
-  // TEST_C_FLAGS should be defined in a c file
+  /* TEST_C_FLAGS should be defined in a c file */
 #ifndef TEST_C_FLAGS  
   strcpy(m, "CMake CMAKE_C_FLAGS (TEST_C_FLAGS) not found in c file.");
   return 0;

Tests/ComplexOneConfig/Executable/testcflags.c

@@ -1,12 +1,12 @@
 #include <string.h>
 int TestCFlags(char* m)
 {
-  // TEST_CXX_FLAGS should not be defined in a c file
+  /* TEST_CXX_FLAGS should not be defined in a c file */
 #ifdef TEST_CXX_FLAGS
   strcpy(m, "CMake CMAKE_CXX_FLAGS (TEST_CXX_FLAGS) found in c file.");
   return 0;
 #endif
-  // TEST_C_FLAGS should be defined in a c file
+  /* TEST_C_FLAGS should be defined in a c file */
 #ifndef TEST_C_FLAGS  
   strcpy(m, "CMake CMAKE_C_FLAGS (TEST_C_FLAGS) not found in c file.");
   return 0;

Tests/ComplexRelativePaths/Executable/testcflags.c

@@ -1,12 +1,12 @@
 #include <string.h>
 int TestCFlags(char* m)
 {
-  // TEST_CXX_FLAGS should not be defined in a c file
+  /* TEST_CXX_FLAGS should not be defined in a c file */
 #ifdef TEST_CXX_FLAGS
   strcpy(m, "CMake CMAKE_CXX_FLAGS (TEST_CXX_FLAGS) found in c file.");
   return 0;
 #endif
-  // TEST_C_FLAGS should be defined in a c file
+  /* TEST_C_FLAGS should be defined in a c file */
 #ifndef TEST_C_FLAGS  
   strcpy(m, "CMake CMAKE_C_FLAGS (TEST_C_FLAGS) not found in c file.");
   return 0;