Begin documenting the nvptx backend.

	gcc/
	* doc/install.texi (nvptx-*-none): New section.
	* doc/invoke.texi (Nvidia PTX Options): Likewise.
	* config/nvptx/nvptx.opt: Update.

From-SVN: r220783

gcc/ChangeLog

 2015-02-18  Thomas Schwinge  <thomas@codesourcery.com>
 
+	* doc/install.texi (nvptx-*-none): New section.
+	* doc/invoke.texi (Nvidia PTX Options): Likewise.
+	* config/nvptx/nvptx.opt: Update.
+
 	* config/nvptx/mkoffload.c (parse_env_var, free_array_of_ptrs)
 	(access_check): New functions, copied from
 	config/i386/intelmic-mkoffload.c.

gcc/config/nvptx/nvptx.opt

@@ -17,13 +17,13 @@
 ; along with GCC; see the file COPYING3.  If not see
 ; <http://www.gnu.org/licenses/>.
 
-m64
-Target Report RejectNegative Mask(ABI64)
-Generate code for a 64 bit ABI
-
 m32
 Target Report RejectNegative InverseMask(ABI64)
-Generate code for a 32 bit ABI
+Generate code for a 32-bit ABI
+
+m64
+Target Report RejectNegative Mask(ABI64)
+Generate code for a 64-bit ABI
 
 mmainkernel
 Target Report RejectNegative

gcc/doc/install.texi

@@ -3304,6 +3304,8 @@ information have to.
 @item
 @uref{#nds32be-x-elf,,nds32be-*-elf}
 @item
+@uref{#nvptx-x-none,,nvptx-*-none}
+@item
 @uref{#powerpc-x-x,,powerpc*-*-*}
 @item
 @uref{#powerpc-x-darwin,,powerpc-*-darwin*}
@@ -4271,6 +4273,27 @@ Andes NDS32 target in big endian mode.
 @html
 <hr />
 @end html
+@anchor{nvptx-x-none}
+@heading nvptx-*-none
+Nvidia PTX target.
+
+Instead of GNU binutils, you will need to install
+@uref{https://github.com/MentorEmbedded/nvptx-tools/,,nvptx-tools}.
+Tell GCC where to find it:
+@option{--with-build-time-tools=[install-nvptx-tools]/nvptx-none/bin}.
+
+A nvptx port of newlib is available at
+@uref{https://github.com/MentorEmbedded/nvptx-newlib/,,nvptx-newlib}.
+It can be automatically built together with GCC@.  For this, add a
+symbolic link to nvptx-newlib's @file{newlib} directory to the
+directory containing the GCC sources.
+
+Use the @option{--disable-sjlj-exceptions} and
+@option{--enable-newlib-io-long-long} options when configuring.
+
+@html
+<hr />
+@end html
 @anchor{powerpc-x-x}
 @heading powerpc-*-*
 You can specify a default version for the @option{-mcpu=@var{cpu_type}}

gcc/doc/invoke.texi

@@ -840,6 +840,9 @@ Objective-C and Objective-C++ Dialects}.
 -mcustom-fpu-cfg=@var{name} @gol
 -mhal -msmallc -msys-crt0=@var{name} -msys-lib=@var{name}}
 
+@emph{Nvidia PTX Options}
+@gccoptlist{-m32 -m64 -mmainkernel}
+
 @emph{PDP-11 Options}
 @gccoptlist{-mfpu  -msoft-float  -mac0  -mno-ac0  -m40  -m45  -m10 @gol
 -mbcopy  -mbcopy-builtin  -mint32  -mno-int16 @gol
@@ -11989,6 +11992,7 @@ platform.
 * MSP430 Options::
 * NDS32 Options::
 * Nios II Options::
+* Nvidia PTX Options::
 * PDP-11 Options::
 * picoChip Options::
 * PowerPC Options::
@@ -18301,6 +18305,28 @@ This option is typically used to link with a library provided by a HAL BSP.
 
 @end table
 
+@node Nvidia PTX Options
+@subsection Nvidia PTX Options
+@cindex Nvidia PTX options
+@cindex nvptx options
+
+These options are defined for Nvidia PTX:
+
+@table @gcctabopt
+
+@item -m32
+@itemx -m64
+@opindex m32
+@opindex m64
+Generate code for 32-bit or 64-bit ABI.
+
+@item -mmainkernel
+@opindex mmainkernel
+Link in code for a __main kernel.  This is for stand-alone instead of
+offloading execution.
+
+@end table
+
 @node PDP-11 Options
 @subsection PDP-11 Options
 @cindex PDP-11 Options