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Diffstat (limited to 'gcc/doc/options.texi')
| -rw-r--r-- | gcc/doc/options.texi | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/gcc/doc/options.texi b/gcc/doc/options.texi index 1c8f5d9f134..e39d79e1c8f 100644 --- a/gcc/doc/options.texi +++ b/gcc/doc/options.texi @@ -1,4 +1,4 @@ -@c Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 +@c Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 @c Free Software Foundation, Inc. @c This is part of the GCC manual. @c For copying conditions, see the file gcc.texi. @@ -436,4 +436,17 @@ the @option{--help} output. Build the @code{cl_target_option} structure to hold a copy of the option, add the functions @code{cl_target_option_save} and @code{cl_target_option_restore} to save and restore the options. + +@item SetByCombined +The option may also be set by a combined option such as +@option{-ffast-math}. This causes the @code{gcc_options} struct to +have a field @code{frontend_set_@var{name}}, where @code{@var{name}} +is the name of the field holding the value of this option (without the +leading @code{x_}). This gives the front end a way to indicate that +the value has been set explicitly and should not be changed by the +combined option. For example, some front ends use this to prevent +@option{-ffast-math} and @option{-fno-fast-math} from changing the +value of @option{-fmath-errno} for languages that do not use +@code{errno}. + @end table |