Based on this (http://gcc.gnu.org/ml/gcc-patches/2012-10/msg02505.html) patch, here is an extended one to fix "@itemx must follow @item"-errors:
Code: diff --git a/gcc/doc/cppopts.texi b/gcc/doc/cppopts.texi
index 27b1095..a2eb79d 100644
--- a/gcc/doc/cppopts.texi
+++ b/gcc/doc/cppopts.texi
@@ -1,5 +1,5 @@
@c Copyright (c) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
-@c 2010, Free Software Foundation, Inc.
+@c 2010, 2012, Free Software Foundation, Inc.
@c This is part of the CPP and GCC manuals.
@c For copying conditions, see the file gcc.texi.
@@ -805,7 +805,7 @@ Replacement: [ ] @{ @} # \ ^ | ~
Enable special code to work around file systems which only permit very
short file names, such as MS-DOS@.
-@itemx --help
+@item --help
@itemx --target-help
@opindex help
@opindex target-help
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index fb1becb..5c4f8fd 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -1251,10 +1251,10 @@ The @code{__flash} qualifier will locate data in the
instruction. Pointers to this address space are 16 bits wide.
@item __flash1
-@item __flash2
-@item __flash3
-@item __flash4
-@item __flash5
+@itemx __flash2
+@itemx __flash3
+@itemx __flash4
+@itemx __flash5
@cindex @code{__flash1} AVR Named Address Spaces
@cindex @code{__flash2} AVR Named Address Spaces
@cindex @code{__flash3} AVR Named Address Spaces
diff --git a/gcc/doc/generic.texi b/gcc/doc/generic.texi
index c739731..e878811 100644
--- a/gcc/doc/generic.texi
+++ b/gcc/doc/generic.texi
@@ -1,4 +1,4 @@
-@c Copyright (c) 2004, 2005, 2007, 2008, 2010 Free Software Foundation, Inc.
+@c Copyright (c) 2004, 2005, 2007, 2008, 2010, 2012 Free Software Foundation, Inc.
@c Free Software Foundation, Inc.
@c This is part of the GCC manual.
@c For copying conditions, see the file gcc.texi.
@@ -1417,13 +1417,13 @@ generate these expressions anyhow, if it can tell that strictness does
not matter. The type of the operands and that of the result are
always of @code{BOOLEAN_TYPE} or @code{INTEGER_TYPE}.
-@itemx POINTER_PLUS_EXPR
+@item POINTER_PLUS_EXPR
This node represents pointer arithmetic. The first operand is always
a pointer/reference type. The second operand is always an unsigned
integer type compatible with sizetype. This is the only binary
arithmetic operand that can operate on pointer types.
-@itemx PLUS_EXPR
+@item PLUS_EXPR
@itemx MINUS_EXPR
@itemx MULT_EXPR
These nodes represent various binary arithmetic operations.
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index afb9f21..15ecaf1 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -1617,7 +1617,7 @@ GNU dialect of ISO C99. When ISO C99 is fully implemented in GCC,
this will become the default. The name @samp{gnu9x} is deprecated.
@item gnu11
-@item gnu1x
+@itemx gnu1x
GNU dialect of ISO C11. Support is incomplete and experimental. The
name @samp{gnu1x} is deprecated.
@@ -5310,7 +5310,7 @@ is set by this option.
For example, with @option{-fdbg-cnt=dce:10,tail_call:0},
@code{dbg_cnt(dce)} returns true only for first 10 invocations.
-@itemx -fenable-@var{kind}-@var{pass}
+@item -fenable-@var{kind}-@var{pass}
@itemx -fdisable-@var{kind}-@var{pass}=@var{range-list}
@opindex fdisable-
@opindex fenable-
@@ -5464,11 +5464,11 @@ Dump after duplicating the computed gotos.
@option{-fdump-rtl-ce3} enable dumping after the three
if conversion passes.
-@itemx -fdump-rtl-cprop_hardreg
+@item -fdump-rtl-cprop_hardreg
@opindex fdump-rtl-cprop_hardreg
Dump after hard register copy propagation.
-@itemx -fdump-rtl-csa
+@item -fdump-rtl-csa
@opindex fdump-rtl-csa
Dump after combining stack adjustments.
@@ -5479,11 +5479,11 @@ Dump after combining stack adjustments.
@option{-fdump-rtl-cse1} and @option{-fdump-rtl-cse2} enable dumping after
the two common subexpression elimination passes.
-@itemx -fdump-rtl-dce
+@item -fdump-rtl-dce
@opindex fdump-rtl-dce
Dump after the standalone dead code elimination passes.
-@itemx -fdump-rtl-dbr
+@item -fdump-rtl-dbr
@opindex fdump-rtl-dbr
Dump after delayed branch scheduling.
@@ -5528,7 +5528,7 @@ Dump after the initialization of the registers.
@opindex fdump-rtl-initvals
Dump after the computation of the initial value sets.
-@itemx -fdump-rtl-into_cfglayout
+@item -fdump-rtl-into_cfglayout
@opindex fdump-rtl-into_cfglayout
Dump after converting to cfglayout mode.
@@ -5558,7 +5558,7 @@ Dump after removing redundant mode switches.
@opindex fdump-rtl-rnreg
Dump after register renumbering.
-@itemx -fdump-rtl-outof_cfglayout
+@item -fdump-rtl-outof_cfglayout
@opindex fdump-rtl-outof_cfglayout
Dump after converting from cfglayout mode.
@@ -10815,10 +10815,10 @@ integer multiply, or integer multiply-and-accumulate.
The default is @option{-mfp-mode=caller}
@item -mnosplit-lohi
+@itemx -mno-postinc
+@itemx -mno-postmodify
@opindex mnosplit-lohi
-@item -mno-postinc
@opindex mno-postinc
-@item -mno-postmodify
@opindex mno-postmodify
Code generation tweaks that disable, respectively, splitting of 32-bit
loads, generation of post-increment addresses, and generation of
@@ -10901,7 +10901,7 @@ statically linked only.
Do not assume that unaligned memory references will be handled by the system.
@item -momit-leaf-frame-pointer
-@item -mno-omit-leaf-frame-pointer
+@itemx -mno-omit-leaf-frame-pointer
@opindex momit-leaf-frame-pointer
@opindex mno-omit-leaf-frame-pointer
Omit or keep the frame pointer in leaf functions. The former behaviour is the
@@ -11739,7 +11739,7 @@ This is the case for devices with at least 16@tie{}KiB of program
memory.
@item __AVR_HAVE_EIJMP_EICALL__
-@item __AVR_3_BYTE_PC__
+@itemx __AVR_3_BYTE_PC__
The device has the @code{EIJMP} and @code{EICALL} instructions.
This is the case for devices with more than 128@tie{}KiB of program memory.
This also means that the program counter
@@ -11750,13 +11750,13 @@ The program counter (PC) is 2@tie{}bytes wide. This is the case for devices
with up to 128@tie{}KiB of program memory.
@item __AVR_HAVE_8BIT_SP__
-@item __AVR_HAVE_16BIT_SP__
+@itemx __AVR_HAVE_16BIT_SP__
The stack pointer (SP) register is treated as 8-bit respectively
16-bit register by the compiler.
The definition of these macros is affected by @code{-mtiny-stack}.
@item __AVR_HAVE_SPH__
-@item __AVR_SP8__
+@itemx __AVR_SP8__
The device has the SPH (high part of stack pointer) special function
register or has an 8-bit stack pointer, respectively.
The definition of these macros is affected by @code{-mmcu=} and
@@ -11764,9 +11764,9 @@ in the cases of @code{-mmcu=avr2} and @code{-mmcu=avr25} also
by @code{-msp8}.
@item __AVR_HAVE_RAMPD__
-@item __AVR_HAVE_RAMPX__
-@item __AVR_HAVE_RAMPY__
-@item __AVR_HAVE_RAMPZ__
+@itemx __AVR_HAVE_RAMPX__
+@itemx __AVR_HAVE_RAMPY__
+@itemx __AVR_HAVE_RAMPZ__
The device has the @code{RAMPD}, @code{RAMPX}, @code{RAMPY},
@code{RAMPZ} special function register, respectively.
@@ -11774,7 +11774,7 @@ The device has the @code{RAMPD}, @code{RAMPX}, @code{RAMPY},
This macro reflects the @code{-mno-interrupts} command line option.
@item __AVR_ERRATA_SKIP__
-@item __AVR_ERRATA_SKIP_JMP_CALL__
+@itemx __AVR_ERRATA_SKIP_JMP_CALL__
Some AVR devices (AT90S8515, ATmega103) must not skip 32-bit
instructions because of a hardware erratum. Skip instructions are
@code{SBRS}, @code{SBRC}, @code{SBIS}, @code{SBIC} and @code{CPSE}.
@@ -18457,7 +18457,7 @@ Mark the @code{MAC} register as call-clobbered, even if
@option{-mhitachi} is given.
@item -mieee
-@item -mno-ieee
+@itemx -mno-ieee
@opindex mieee
@opindex mnoieee
Control the IEEE compliance of floating-point comparisons, which affects the
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
index dfbdc4c..bca0d8f 100644
--- a/gcc/doc/md.texi
+++ b/gcc/doc/md.texi
@@ -4483,8 +4483,8 @@ means of constraints requiring operands 1 and 0 to be the same location.
@cindex @code{ior@var{m}3} instruction pattern
@cindex @code{xor@var{m}3} instruction pattern
@item @samp{ssadd@var{m}3}, @samp{usadd@var{m}3}
-@item @samp{sub@var{m}3}, @samp{sssub@var{m}3}, @samp{ussub@var{m}3}
-@item @samp{mul@var{m}3}, @samp{ssmul@var{m}3}, @samp{usmul@var{m}3}
+@itemx @samp{sub@var{m}3}, @samp{sssub@var{m}3}, @samp{ussub@var{m}3}
+@itemx @samp{mul@var{m}3}, @samp{ssmul@var{m}3}, @samp{usmul@var{m}3}
@itemx @samp{div@var{m}3}, @samp{ssdiv@var{m}3}
@itemx @samp{udiv@var{m}3}, @samp{usdiv@var{m}3}
@itemx @samp{mod@var{m}3}, @samp{umod@var{m}3}
diff --git a/gcc/doc/sourcebuild.texi b/gcc/doc/sourcebuild.texi
index 89e7712..ec8263f 100644
--- a/gcc/doc/sourcebuild.texi
+++ b/gcc/doc/sourcebuild.texi
@@ -691,7 +691,7 @@ standard rule in @file{gcc/Makefile.in} to the variable
@code{lang_checks}.
@table @code
-@itemx all.cross
+@item all.cross
@itemx start.encap
@itemx rest.encap
FIXME: exactly what goes in each of these targets?
--- invoke.texi 2014-03-08 12:25:19.000000000 +0100
+++ invoke.texi.orig 2012-01-03 17:43:38.000000000 +0100
@@ -165,7 +165,7 @@
-pipe -pass-exit-codes @gol
-x @var{language} -v -### --help@r{[}=@var{class}@r{[},@dots{}@r{]]} --target-help @gol
--version -wrapper @@@var{file} -fplugin=@var{file} -fplugin-arg-@var{name}=@var{arg} @gol
--fdump-ada-spec@r{[}-slim@r{]}}
+-fdump-ada-spec@r{[}-slim@r{]}} -fdump-go-spec=@var{file}
@item C Language Options
@xref{C Dialect Options,,Options Controlling C Dialect}.
@@ -5085,11 +5085,11 @@
@option{-fdump-rtl-ce3} enable dumping after the three
if conversion passes.
-@item -fdump-rtl-cprop_hardreg
+@itemx -fdump-rtl-cprop_hardreg
@opindex fdump-rtl-cprop_hardreg
Dump after hard register copy propagation.
-@item -fdump-rtl-csa
+@itemx -fdump-rtl-csa
@opindex fdump-rtl-csa
Dump after combining stack adjustments.
@@ -5100,11 +5100,11 @@
@option{-fdump-rtl-cse1} and @option{-fdump-rtl-cse2} enable dumping after
the two common sub-expression elimination passes.
-@item -fdump-rtl-dce
+@itemx -fdump-rtl-dce
@opindex fdump-rtl-dce
Dump after the standalone dead code elimination passes.
-@item -fdump-rtl-dbr
+@itemx -fdump-rtl-dbr
@opindex fdump-rtl-dbr
Dump after delayed branch scheduling.
@@ -5149,7 +5149,7 @@
@opindex fdump-rtl-initvals
Dump after the computation of the initial value sets.
-@item -fdump-rtl-into_cfglayout
+@itemx -fdump-rtl-into_cfglayout
@opindex fdump-rtl-into_cfglayout
Dump after converting to cfglayout mode.
@@ -5179,7 +5179,7 @@
@opindex fdump-rtl-rnreg
Dump after register renumbering.
-@item -fdump-rtl-outof_cfglayout
+@itemx -fdump-rtl-outof_cfglayout
@opindex fdump-rtl-outof_cfglayout
Dump after converting from cfglayout mode.
@@ -5191,7 +5191,7 @@
@opindex fdump-rtl-postreload
Dump after post-reload optimizations.
-@item -fdump-rtl-pro_and_epilogue
+@itemx -fdump-rtl-pro_and_epilogue
@opindex fdump-rtl-pro_and_epilogue
Dump after generating the function pro and epilogues.
