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# DP: Turn on -Wformat -Wformat-security by default for C, C++, ObjC, ObjC++.
Index: b/src/gcc/doc/invoke.texi
===================================================================
--- a/src/gcc/doc/invoke.texi
+++ b/src/gcc/doc/invoke.texi
@@ -3351,6 +3351,11 @@
in future warnings may be added to @option{-Wformat-security} that are not
included in @option{-Wformat-nonliteral}.)
+NOTE: In Ubuntu 8.10 and later versions this option is enabled by default
+for C, C++, ObjC, ObjC++. To disable, use @option{-Wno-format-security},
+or disable all format warnings with @option{-Wformat=0}. To make format
+security warnings fatal, specify @option{-Werror=format-security}.
+
@item -Wformat-y2k
@opindex Wformat-y2k
@opindex Wno-format-y2k
--- a/src/gcc/gcc.c
+++ b/src/gcc/gcc.c
@@ -654,11 +654,14 @@
#define LINK_GCC_C_SEQUENCE_SPEC "%G %L %G"
#endif
+/* no separate spec, just shove it into the ssp default spec */
+#define FORMAT_SECURITY_SPEC "%{!Wformat:%{!Wformat=2:%{!Wformat=0:%{!Wall:-Wformat} %{!Wno-format-security:-Wformat-security}}}}"
+
#ifndef SSP_DEFAULT_SPEC
#ifdef TARGET_LIBC_PROVIDES_SSP
-#define SSP_DEFAULT_SPEC "%{!fno-stack-protector:%{!fstack-protector-all:%{!ffreestanding:%{!nostdlib:-fstack-protector}}}}"
+#define SSP_DEFAULT_SPEC "%{!fno-stack-protector:%{!fstack-protector-all:%{!ffreestanding:%{!nostdlib:-fstack-protector}}}} " FORMAT_SECURITY_SPEC
#else
-#define SSP_DEFAULT_SPEC ""
+#define SSP_DEFAULT_SPEC FORMAT_SECURITY_SPEC
#endif
#endif
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