diff options
Diffstat (limited to 'gcc/ada/gnat_rm.texi')
| -rw-r--r-- | gcc/ada/gnat_rm.texi | 33 |
1 files changed, 23 insertions, 10 deletions
diff --git a/gcc/ada/gnat_rm.texi b/gcc/ada/gnat_rm.texi index 5c1a5475c03..7f3596bdeb5 100644 --- a/gcc/ada/gnat_rm.texi +++ b/gcc/ada/gnat_rm.texi @@ -6520,10 +6520,12 @@ implementation in DEC Ada 83. Syntax: @smallexample @c ada -pragma Warnings (On | Off); -pragma Warnings (On | Off, LOCAL_NAME); -pragma Warnings (static_string_EXPRESSION); -pragma Warnings (On | Off, static_string_EXPRESSION); +pragma Warnings (On | Off [,REASON]); +pragma Warnings (On | Off, LOCAL_NAME [,REASON]); +pragma Warnings (static_string_EXPRESSION [,REASON]); +pragma Warnings (On | Off, static_string_EXPRESSION [,REASON]); + +REASON ::= Reason => static_string_EXPRESSION @end smallexample @noindent @@ -6531,17 +6533,28 @@ Normally warnings are enabled, with the output being controlled by the command line switch. Warnings (@code{Off}) turns off generation of warnings until a Warnings (@code{On}) is encountered or the end of the current unit. If generation of warnings is turned off using this -pragma, then no warning messages are output, regardless of the -setting of the command line switches. +pragma, then some or all of the warning messages are suppressed, +regardless of the setting of the command line switches. + +The @code{Reason} parameter may optionally appear as the last argument +in any of the forms of this pragma. It is intended purely for the +purposes of documenting the reason for the @code{Warnings} pragma. +The compiler will check that the argument is a static string but +otherwise ignore this argument. Other tools may provide specialized +processing for this string. -The form with a single argument may be used as a configuration pragma. +The form with a single argument (or two arguments if Reason present), +where the first argument is @code{ON} or @code{OFF} +may be used as a configuration pragma. If the @var{LOCAL_NAME} parameter is present, warnings are suppressed for the specified entity. This suppression is effective from the point where it occurs till the end of the extended scope of the variable (similar to -the scope of @code{Suppress}). +the scope of @code{Suppress}). This form cannot be used as a configuration +pragma. -The form with a single static_string_EXPRESSION argument provides more precise +The form with a single static_string_EXPRESSION argument (and possible +reason) provides more precise control over which warnings are active. The string is a list of letters specifying which warnings are to be activated and which deactivated. The code for these letters is the same as the string used in the command @@ -6549,7 +6562,7 @@ line switch controlling warnings. For a brief summary, use the gnatmake command with no arguments, which will generate usage information containing the list of warnings switches supported. For full details see @ref{Warning Message Control,,, gnat_ugn, @value{EDITION} -User's Guide}. +User's Guide}. This form can also be used as a configuration pragma. @noindent The warnings controlled by the `-gnatw' switch are generated by the front end |