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Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index bf05c075bfd..21b785324ed 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -1849,6 +1849,14 @@ If @option{-Wformat} is specified, do not warn about excess arguments to a @code{printf} or @code{scanf} format function. The C standard specifies that such arguments are ignored. +Where the unused arguments lie between used arguments that are +specified with @samp{$} operand number specifications, normally +warnings are still given, since the implementation could not know what +type to pass to @code{va_arg} to skip the unused arguments. However, +in the case of @code{scanf} formats, this option will suppress the +warning if the unused arguments are all pointers, since the Single +Unix Specification says that such unused arguments are allowed. + @item -Wformat-nonliteral @opindex Wformat-nonliteral If @option{-Wformat} is specified, also warn if the format string is not a |