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invoke.texi (AVR Options): Document __AVR_ARCH__.

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* doc/invoke.texi (AVR Options): Document __AVR_ARCH__.
	Note __AVR_<device>__ is not defined for cores.
	Don't point to --help=target.

From-SVN: r192685
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Georg-Johann Lay 2012-10-22 11:13:54 +00:00 committed by Georg-Johann Lay
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@ -1,3 +1,9 @@
2012-10-22 Georg-Johann Lay <avr@gjlay.de>
* doc/invoke.texi (AVR Options): Document __AVR_ARCH__.
Note __AVR_<device>__ is not defined for cores.
Don't point to --help=target.
2012-10-22 Sameera Deshpande <sameera.deshpande@arm.com>
Greta Yorsh <Greta.Yorsh@arm.com>

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gcc/doc/invoke.texi
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@ -11247,9 +11247,6 @@ These options are defined for AVR implementations:
@opindex mmcu
Specify Atmel AVR instruction set architectures (ISA) or MCU type.
For a complete list of @var{mcu} values that are supported by @command{avr-gcc},
see the compiler output when called with the @option{--help=target}
command line option.
The default for this option is@tie{}@code{avr2}.
GCC supports the following AVR devices and ISAs:
@ -11540,6 +11537,23 @@ For even more AVR-specific built-in macros see
@table @code
@item __AVR_ARCH__
Build-in macro that resolves to a decimal number that identifies the
architecture and depends on the @code{-mmcu=@var{mcu}} option.
Possible values are:
@code{2}, @code{25}, @code{3}, @code{31}, @code{35},
@code{4}, @code{5}, @code{51}, @code{6}, @code{102}, @code{104},
@code{105}, @code{106}, @code{107}
for @var{mcu}=@code{avr2}, @code{avr25}, @code{avr3},
@code{avr31}, @code{avr35}, @code{avr4}, @code{avr5}, @code{avr51},
@code{avr6}, @code{avrxmega2}, @code{avrxmega4}, @code{avrxmega5},
@code{avrxmega6}, @code{avrxmega7}, respectively.
If @var{mcu} specifies a device, this built-in macro is set
accordingly. For example, with @code{-mmcu=atmega8} the macro will be
defined to @code{4}.
@item __AVR_@var{Device}__
Setting @code{-mmcu=@var{device}} defines this built-in macro which reflects
the device's name. For example, @code{-mmcu=atmega8} defines the
@ -11552,6 +11566,9 @@ the device name as from the AVR user manual. The difference between
@var{Device} in the built-in macro and @var{device} in
@code{-mmcu=@var{device}} is that the latter is always lowercase.
If @var{device} is not a device but only a core architecture like
@code{avr51}, this macro will not be defined.
@item __AVR_HAVE_ELPM__
The device has the the @code{ELPM} instruction.