* invoke.texi: Document the -mvxworks option for rs6000 ELF.

From-SVN: r36124

gcc/ChangeLog

 2000-09-03  Geoff Keating  <geoffk@cygnus.com>
 
+	* invoke.texi: Document the -mvxworks option for rs6000 ELF.
+
 	* config/rs6000/rs6000.h: Update various comments about XER_REGNO.
 	(REGNO_REG_CLASS): Use symbolic register
 	names.

gcc/invoke.texi

@@ -340,7 +340,7 @@ in the following sections.
 -mtoc  -mno-toc -mlittle  -mlittle-endian  -mbig  -mbig-endian
 -mcall-aix  -mcall-sysv  -mprototype  -mno-prototype
 -msim  -mmvme  -mads  -myellowknife  -memb -msdata
--msdata=@var{opt}  -G @var{num}
+-msdata=@var{opt}  -mvxworks -G @var{num}
 
 @emph{RT Options}
 -mcall-lib-mul  -mfp-arg-in-fpregs  -mfp-arg-in-gregs
@@ -5565,6 +5565,10 @@ On embedded PowerPC systems, assume that the startup module is called
 @file{crt0.o} and the standard C libraries are @file{libyk.a} and
 @file{libc.a}.
 
+@item -mvxworks
+On System V.4 and embedded PowerPC systems, specify that you are
+compiling for a VxWorks system.
+
 @item -memb
 On embedded PowerPC systems, set the @var{PPC_EMB} bit in the ELF flags
 header to indicate that @samp{eabi} extended relocations are used.