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diff --git a/gcc/c.opt b/gcc/c.opt
index bdf9531ad80..01d6428ea6a 100644
--- a/gcc/c.opt
+++ b/gcc/c.opt
@@ -1,5 +1,5 @@
 ; Options for the C, ObjC, C++ and ObjC++ front ends.
-; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009
+; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
 ; Free Software Foundation, Inc.
 ;
 ; This file is part of GCC.
@@ -171,6 +171,10 @@ Wconversion
 C ObjC C++ ObjC++ Var(warn_conversion) Warning
 Warn for implicit type conversions that may change a value
 
+Wconversion-null
+C++ ObjC++ Var(warn_conversion_null) Init(1) Warning
+Warn for converting NULL from/to a non-pointer type
+
 Wsign-conversion
 C ObjC C++ ObjC++ Var(warn_sign_conversion) Init(-1)
 Warn for implicit type conversions between signed and unsigned integers
@@ -259,21 +263,22 @@ C ObjC C++ ObjC++ Var(warn_init_self) Warning
 Warn about variables which are initialized to themselves
 
 Wimplicit
-C ObjC C++ ObjC++ Warning
+C ObjC Var(warn_implicit) Init(-1) Warning
+Warn about implicit declarations
 
 Wimplicit-function-declaration
 C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning
 Warn about implicit function declarations
 
 Wimplicit-int
-C ObjC Var(warn_implicit_int) Warning
+C ObjC Var(warn_implicit_int) Init(-1) Warning
 Warn when a declaration does not specify a type
 
 Wimport
 C ObjC C++ ObjC++ Undocumented
 
 Wint-to-pointer-cast
-C ObjC Var(warn_int_to_pointer_cast) Init(1) Warning
+C ObjC C++ ObjC++ Var(warn_int_to_pointer_cast) Init(1) Warning
 Warn when there is a cast to a pointer from an integer of a different size
 
 Winvalid-offsetof
@@ -684,6 +689,10 @@ C++ ObjC++
 fnonnull-objects
 C++ ObjC++
 
+fnothrow-opt
+C++ ObjC++ Optimization Var(flag_nothrow_opt)
+Treat a throw() exception specification as noexcept to improve code size
+
 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
 ; to initialize any non-POD ivars in Objective-C++ classes.
 fobjc-call-cxx-cdtors
@@ -779,6 +788,10 @@ fstats
 C++ ObjC++
 Display statistics accumulated during compilation
 
+fstrict-enums
+C++ ObjC++ Optimization Var(flag_strict_enums)
+Assume that values of enumeration type are always within the minimum range of that type
+
 fstrict-prototype
 C++ ObjC++
 
@@ -787,8 +800,11 @@ C ObjC C++ ObjC++ Joined RejectNegative UInteger
 -ftabstop=<number>	Distance between tab stops for column reporting
 
 ftemplate-depth-
+C++ ObjC++ Joined RejectNegative UInteger Undocumented
+
+ftemplate-depth=
 C++ ObjC++ Joined RejectNegative UInteger
--ftemplate-depth-<number>	Specify maximum template instantiation depth
+-ftemplate-depth=<number>	Specify maximum template instantiation depth
 
 fthis-is-variable
 C++ ObjC++
@@ -875,7 +891,7 @@ C ObjC C++ ObjC++ Joined Separate
 
 imultilib
 C ObjC C++ ObjC++ Joined Separate
--imultilib <dir> Set <dir> to be the multilib include subdirectory
+-imultilib <dir>	Set <dir> to be the multilib include subdirectory
 
 include
 C ObjC C++ ObjC++ Joined Separate
@@ -954,10 +970,18 @@ become a part of the upcoming ISO C++ standard, dubbed C++0x. Note that the
 extensions enabled by this mode are experimental and may be removed in
 future releases of GCC.
 
+std=c1x
+C ObjC
+Conform to the ISO 201X C standard draft (experimental and incomplete support)
+
 std=c89
 C ObjC
 Conform to the ISO 1990 C standard
 
+std=c90
+C ObjC
+Conform to the ISO 1990 C standard
+
 std=c99
 C ObjC
 Conform to the ISO 1999 C standard
@@ -977,10 +1001,18 @@ extensions that are likely to become a part of the upcoming ISO C++
 standard, dubbed C++0x. Note that the extensions enabled by this mode
 are experimental and may be removed in future releases of GCC.
 
+std=gnu1x
+C ObjC
+Conform to the ISO 201X C standard draft with GNU extensions (experimental and incomplete support)
+
 std=gnu89
 C ObjC
 Conform to the ISO 1990 C standard with GNU extensions
 
+std=gnu90
+C ObjC
+Conform to the ISO 1990 C standard with GNU extensions
+
 std=gnu99
 C ObjC
 Conform to the ISO 1999 C standard with GNU extensions