* doc/options.texi: Document the new MaskExists flag.

	* opth-gen.awk: Don't output MASK and TARGET macros for Mask(...)
	if the option has the MaskExists flag.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@97238 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 10 insertions, 0 deletions

diff --git a/gcc/doc/options.texi b/gcc/doc/options.texi
index 138ebdb838d..959f952fc94 100644
--- a/gcc/doc/options.texi
+++ b/gcc/doc/options.texi
@@ -144,6 +144,7 @@ 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}.
 
 @item InverseMask(@var{othername})
 @itemx InverseMask(@var{othername}, @var{thisname})
@@ -152,6 +153,15 @@ The option is the inverse of another option that has the
 the options-processing script will declare a @code{TARGET_@var{thisname}}
 macro that is 1 when the option is active and 0 otherwise.
 
+@item MaskExists
+The mask specified by the @code{Mask} property already exists.
+No @code{MASK} or @code{TARGET} definitions should be added to
+@file{options.h} in response to this option record.
+
+The main purpose of this property is to support synonymous options.
+The first option should use @samp{Mask(@var{name})} and the others
+should use @samp{Mask(@var{name}) MaskExists}.
+
 @item Report
 The state of the option should be printed by @option{-fverbose-asm}.