--- gcc/gcc/c-family/c.opt

+++ gcc/gcc/c-family/c.opt

@@ -459,7 +459,7 @@ C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning LangEnabledBy(C ObjC C++ O

 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

@@ -571,7 +571,7 @@

 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) IntegerRange(0, 2)

+C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format) Init(1) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0) IntegerRange(0, 2)

 Warn about printf/scanf/strftime/strfmon format string anomalies.

 Wformat-overflow=

--- gcc/gcc/doc/invoke.texi

+++ gcc/gcc/doc/invoke.texi

@@ -3739,6 +3739,9 @@ options: @option{-Wno-format-contains-nul},

 @option{-Wno-format-extra-args}, and @option{-Wno-format-zero-length}.

 @option{-Wformat} is enabled by @option{-Wall}.

+NOTE: In ALT Linux gcc 4.4.0-alt1 and later versions this option is enabled

+by default for C, C++, ObjC, ObjC++.  To disable, use @option{-Wformat=0}.

+

 @item -Wno-format-contains-nul

 @opindex Wno-format-contains-nul

 @opindex Wformat-contains-nul

@@ -3793,6 +3796,12 @@ currently a subset of what @option{-Wformat-nonliteral} warns about, but

 in future warnings may be added to @option{-Wformat-security} that are not

 included in @option{-Wformat-nonliteral}.)

+NOTE: In ALT Linux gcc 4.4.0-alt1 and later versions this option is enabled

+by default for C, C++, ObjC, ObjC++.

+To disable, use @option{-Wno-format-security}.

+To make format security warnings fatal, specify

+@option{-Werror=format-security}.

+

 @item -Wformat-signedness

 @opindex Wformat-signedness

 @opindex Wno-format-signedness