Warn about format strings that are not literals
Wformat-contains-nul
-C ObjC C++ ObjC++ Var(warn_format_contains_nul)
+C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning
Warn about format strings that contain NUL bytes
Wformat-security
Do not warn about using \"long long\" when -pedantic
Wmain
-C ObjC Warning
+C ObjC C++ ObjC++ Warning
Warn about suspicious declarations of \"main\"
Wmissing-braces
Scope of for-init-statement variables is local to the loop
ffreestanding
-C ObjC
+C ObjC C++ ObjC++
Do not assume that standard C libraries and \"main\" exist
fgnu-keywords