diff options
Diffstat (limited to 'gcc/doc/options.texi')
| -rw-r--r-- | gcc/doc/options.texi | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/gcc/doc/options.texi b/gcc/doc/options.texi index ccc6c910..d5d1984 100644 --- a/gcc/doc/options.texi +++ b/gcc/doc/options.texi @@ -154,14 +154,20 @@ The variable specified by the @code{Var} property should be statically initialized to @var{value}. @item Mask(@var{name}) -The option is associated with a bit in the @code{target_flags} variable -(@pxref{Run-time Target}) and is active when that bit is set. - -The options-processing script will automatically allocate a unique -bit for the option and set the macro @code{MASK_@var{name}} to the -appropriate bitmask. It will also declare a @code{TARGET_@var{name}} -macro that has the value 1 when the option is active and 0 otherwise. -You can disable this behavior using @code{MaskExists}. +The option is associated with a bit in the @code{target_flags} +variable (@pxref{Run-time Target}) and is active when that bit is set. +You may also specify @code{Var} to select a variable other than +@code{target_flags}. + +The options-processing script will automatically allocate a unique bit +for the option. If the option is attached to @samp{target_flags}, +the script will set the macro @code{MASK_@var{name}} to the appropriate +bitmask. It will also declare a @code{TARGET_@var{name}} macro that has +the value 1 when the option is active and 0 otherwise. If you use @code{Var} +to attach the option to a different variable, the associated macros are +called @code{OPTION_MASK_@var{name}} and @code{OPTION_@var{name}} respectively. + +You can disable automatic bit alloction using @code{MaskExists}. @item InverseMask(@var{othername}) @itemx InverseMask(@var{othername}, @var{thisname}) |