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| -rw-r--r-- | gcc/doc/invoke.texi | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 8dcba6e..39920a8 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -2807,6 +2807,15 @@ two forms, whichever is not the default. For further, language-specific options also refer to @ref{C++ Dialect Options} and @ref{Objective-C and Objective-C++ Dialect Options}. +When an unrecognized warning label is requested, for example +@option{-Wunknwon-warning}, GCC will emit a diagnostic stating +that the option is not recognized. However, if the @samp{-Wno-} form +is used, the behavior is slightly different: No diagnostic will be +produced for @option{-Wno-unknown-warning} unless other diagnostics +are being produced. This allows the use of new @option{-Wno-} options +with old compilers, but if something goes wrong, the compiler will +warn that an unrecognized option was used. + @table @gcctabopt @item -pedantic @opindex pedantic |