diff options
Diffstat (limited to 'gcc/doc/options.texi')
| -rw-r--r-- | gcc/doc/options.texi | 27 |
1 files changed, 10 insertions, 17 deletions
diff --git a/gcc/doc/options.texi b/gcc/doc/options.texi index 924ac17..d774b36 100644 --- a/gcc/doc/options.texi +++ b/gcc/doc/options.texi @@ -46,10 +46,10 @@ information. These records have two fields: the string @samp{Variable}, and a declaration of the type and name of the variable, optionally with an initializer (but without any trailing @samp{;}). These records may be used for variables used for many -options where declaring the variable and its initializer by omitting -@code{VarExists} from a single option definition record would be -inappropriate, or for variables set in option handlers rather than -referenced by @code{Var} properties. +options where declaring the initializer in a single option definition +record, or duplicating it in many records, would be inappropriate, or +for variables set in option handlers rather than referenced by +@code{Var} properties. @item An option definition record. These records have the following fields: @@ -177,7 +177,8 @@ compatibility with existing options that are used both directly and via @option{-Wp,}; new options should not have this property. @item Var(@var{var}) -The state of this option should be stored in variable @var{var}. +The state of this option should be stored in variable @var{var} +(actually a macro for @code{global_options.x_@var{var}}). The way that the state is stored depends on the type of option: @itemize @bullet @@ -201,9 +202,8 @@ the argument string. The pointer will be null if the argument is optional and wasn't given. @end itemize -The option-processing script will usually declare @var{var} in -@file{options.c} and leave it to be zero-initialized at start-up time. -You can modify this behavior using @code{VarExists} and @code{Init}. +The option-processing script will usually zero-initialize @var{var}. +You can modify this behavior using @code{Init}. @item Var(@var{var}, @var{set}) The option controls an integer variable @var{var} and is active when @@ -214,17 +214,10 @@ when the ``no-'' form is used. @var{var} is declared in the same way as for the single-argument form described above. -@item VarExists -The variable specified by the @code{Var} property already exists. -No definition should be added to @file{options.c} in response to -this option record. - -You should use this property only if the variable is declared outside -@file{options.c}. - @item Init(@var{value}) The variable specified by the @code{Var} property should be statically -initialized to @var{value}. +initialized to @var{value}. If more than one option using the same +variable specifies @code{Init}, all must specify the same initializer. @item Mask(@var{name}) The option is associated with a bit in the @code{target_flags} |