diff options
Diffstat (limited to 'gcc/doc/options.texi')
| -rw-r--r-- | gcc/doc/options.texi | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/gcc/doc/options.texi b/gcc/doc/options.texi index d552b64d1f4..9387c82cd3d 100644 --- a/gcc/doc/options.texi +++ b/gcc/doc/options.texi @@ -132,6 +132,21 @@ be accepted by the driver. This is used for cases such as @option{-march=native} that are processed by the driver so that @samp{gcc -v} shows how the options chosen depended on the system on which the compiler was run. + +@item Set(@var{number}) +This property is optional, required for enumerations used in +@code{EnumSet} options. @var{number} should be decimal number between +1 and 64 inclusive and divides the enumeration into a set of +sets of mutually exclusive arguments. Arguments with the same +@var{number} can't be specified together in the same option, but +arguments with different @var{number} can. @var{value} needs to be +chosen such that a mask of all @var{value} values from the same set +@var{number} bitwise ored doesn't overlap with masks for other sets. +When @code{-foption=arg_from_set1,arg_from_set4} and +@code{-fno-option=arg_from_set3} are used, the effect is that previous +value of the @code{Var} will get bits from set 1 and 4 masks cleared, +ored @code{Value} of @code{arg_from_set1} and @code{arg_from_set4} +and then will get bits from set 3 mask cleared. @end table @item @@ -396,6 +411,16 @@ with the corresponding @samp{Enum} record. The string is checked and converted to the integer specified in the corresponding @samp{EnumValue} record before being passed to option handlers. +@item EnumSet +Must be used together with the @code{Enum(@var{name})} property. +Corresponding @samp{Enum} record must use @code{Set} properties. +The option's argument is either a string from the set like for +@code{Enum(@var{name})}, but with a slightly different behavior that +the whole @code{Var} isn't overwritten, but only the bits in all the +enumeration values with the same set bitwise ored together. +Or option's argument can be a comma separated list of strings where +each string is from a different @code{Set(@var{number})}. + @item Defer The option should be stored in a vector, specified with @code{Var}, for later processing. |