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| author | Georg-Johann Lay <avr@gjlay.de> | 2012-10-22 11:13:54 +0000 |
|---|---|---|
| committer | Georg-Johann Lay <gjl@gcc.gnu.org> | 2012-10-22 11:13:54 +0000 |
| commit | 09246494b3591c1ad5170170945bdb3a89ad7d70 (patch) | |
| tree | dda37c000070f0b1fd354d95acd3c8fa99fde270 /gcc/doc | |
| parent | a0e917106a747657b2022a1a07af409a94d2062f (diff) | |
| download | gcc-09246494b3591c1ad5170170945bdb3a89ad7d70.zip gcc-09246494b3591c1ad5170170945bdb3a89ad7d70.tar.gz gcc-09246494b3591c1ad5170170945bdb3a89ad7d70.tar.bz2 | |
invoke.texi (AVR Options): Document __AVR_ARCH__.
* 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
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index a66dff1..20c4e73 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -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. |