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Enable -Wformat and -Wformat-security by default.
--- a/gcc/c-family/c.opt 2016-03-23 18:51:56.000000000 +0100
+++ b/gcc/c-family/c.opt 2016-04-28 23:45:54.063351272 +0200
@@ -459,7 +459,7 @@ C ObjC C++ ObjC++ Var(warn_format_nonlit
Warn about format strings that are not literals.
Wformat-security
-C ObjC C++ ObjC++ Var(warn_format_security) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
+C ObjC C++ ObjC++ Var(warn_format_security) Init(1) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
Warn about possible security problems with format functions.
Wformat-signedness
@@ -475,7 +475,7 @@ C ObjC C++ ObjC++ Var(warn_format_zero_l
Warn about zero-length formats.
Wformat=
-C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
+C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format) Init(1) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
Warn about printf/scanf/strftime/strfmon format string anomalies.
Wignored-qualifiers
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