yann@2149: diff -durN gcc-4.4.5.orig/gcc/c-common.c gcc-4.4.5/gcc/c-common.c
yann@2149: --- gcc-4.4.5.orig/gcc/c-common.c	2010-07-27 15:07:28.000000000 +0200
yann@2149: +++ gcc-4.4.5/gcc/c-common.c	2010-10-09 22:59:03.000000000 +0200
yann@2149: @@ -301,7 +301,7 @@
yann@2149:  /* Warn about format/argument anomalies in calls to formatted I/O functions
yann@2149:     (*printf, *scanf, strftime, strfmon, etc.).  */
yann@2149:  
yann@2149: -int warn_format;
yann@2149: +int warn_format = 1;
yann@2149:  
yann@2149:  /* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
yann@2149:     with GCC this doesn't matter as __null is guaranteed to have the right
yann@2149: diff -durN gcc-4.4.5.orig/gcc/c.opt gcc-4.4.5/gcc/c.opt
yann@2149: --- gcc-4.4.5.orig/gcc/c.opt	2009-09-18 23:53:23.000000000 +0200
yann@2149: +++ gcc-4.4.5/gcc/c.opt	2010-10-09 22:59:03.000000000 +0200
yann@2149: @@ -236,7 +236,7 @@
yann@2149:  Warn about format strings that contain NUL bytes
yann@2149:  
yann@2149:  Wformat-security
yann@2149: -C ObjC C++ ObjC++ Var(warn_format_security) Warning
yann@2149: +C ObjC C++ ObjC++ Var(warn_format_security) Init(1) Warning
yann@2149:  Warn about possible security problems with format functions
yann@2149:  
yann@2149:  Wformat-y2k
yann@2149: diff -durN gcc-4.4.5.orig/gcc/doc/invoke.texi gcc-4.4.5/gcc/doc/invoke.texi
yann@2149: --- gcc-4.4.5.orig/gcc/doc/invoke.texi	2010-09-08 20:13:03.000000000 +0200
yann@2149: +++ gcc-4.4.5/gcc/doc/invoke.texi	2010-10-09 22:59:03.000000000 +0200
yann@2149: @@ -2888,6 +2888,9 @@
yann@2149:  @option{-Wformat-nonliteral}, @option{-Wformat-security}, and
yann@2149:  @option{-Wformat=2} are available, but are not included in @option{-Wall}.
yann@2149:  
yann@2149: +NOTE: In Gentoo, this option is enabled by default for C, C++, ObjC, ObjC++.
yann@2149: +To disable, use @option{-Wformat=0}.
yann@2149: +
yann@2149:  @item -Wformat-y2k
yann@2149:  @opindex Wformat-y2k
yann@2149:  @opindex Wno-format-y2k
yann@2149: @@ -2941,6 +2944,11 @@
yann@2149:  in future warnings may be added to @option{-Wformat-security} that are not
yann@2149:  included in @option{-Wformat-nonliteral}.)
yann@2149:  
yann@2149: +NOTE: In Gentoo, this option is enabled by default for C, C++, ObjC, ObjC++.
yann@2149: +To disable, use @option{-Wno-format-security}, or disable all format warnings
yann@2149: +with @option{-Wformat=0}.  To make format security warnings fatal, specify
yann@2149: +@option{-Werror=format-security}.
yann@2149: +
yann@2149:  @item -Wformat=2
yann@2149:  @opindex Wformat=2
yann@2149:  @opindex Wno-format=2