re PR target/47930 (-marm is undocumented; driver accepts -mno-thumb)

2011-05-06  Ramana Radhakrishnan  <ramana.radhakrishnan@linaro.org>

      PR target/47930
      * config/arm/arm.opt (marm): Document it.
      (mthumb): Reject negative variant.

From-SVN: r173481

gcc/ChangeLog

+2011-05-06  Ramana Radhakrishnan  <ramana.radhakrishnan@linaro.org>
+
+      PR target/47930
+      * config/arm/arm.opt (marm): Document it.
+      (mthumb): Reject negative variant.
+
 2011-05-06  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/48898

gcc/config/arm/arm.opt

@@ -52,7 +52,8 @@ Target RejectNegative Joined Enum(arm_arch) Var(arm_arch_option)
 Specify the name of the target architecture
 
 marm
-Target RejectNegative InverseMask(THUMB) Undocumented
+Target Report RejectNegative InverseMask(THUMB)
+Generate code in 32 bit ARM state.
 
 mbig-endian
 Target Report RejectNegative Mask(BIG_END)
@@ -131,8 +132,8 @@ Target RejectNegative Joined Var(structure_size_string)
 Specify the minimum bit alignment of structures
 
 mthumb
-Target Report Mask(THUMB)
-Compile for the Thumb not the ARM
+Target Report RejectNegative Mask(THUMB)
+Generate code for Thumb state
 
 mthumb-interwork
 Target Report Mask(INTERWORK)

gcc/doc/invoke.texi

@@ -10282,15 +10282,15 @@ there is a function name embedded immediately preceding this location
 and has length @code{((pc[-3]) & 0xff000000)}.
 
 @item -mthumb
+@itemx -marm
+@opindex marm
 @opindex mthumb
-Generate code for the Thumb instruction set.  The default is to
-use the 32-bit ARM instruction set.
-This option automatically enables either 16-bit Thumb-1 or
-mixed 16/32-bit Thumb-2 instructions based on the @option{-mcpu=@var{name}}
-and @option{-march=@var{name}} options.  This option is not passed to the
-assembler. If you want to force assembler files to be interpreted as Thumb code,
-either add a @samp{.thumb} directive to the source or pass the @option{-mthumb}
-option directly to the assembler by prefixing it with @option{-Wa}.
+
+Select between generating code that executes in ARM and Thumb
+states.  The default for most configurations is to generate code
+that executes in ARM state, but the default can be changed by
+configuring GCC with the @option{--with-mode=}@var{state}
+configure option.
 
 @item -mtpcs-frame
 @opindex mtpcs-frame