This is enabled by the undocumented option -fformat-extensions.
This option should be named better and/or give more control over
the extensions.
Fixed a message - don't warn about the field width when it's the
precision that has the wrong type. Didn't fix excessive checking
for the precision relative to the type - ANSI requires both to be
ints, but gcc permits the field width to be either int or unsigned
int.
attribute. It is like the existing "printf" archetype, except that
it doesn't complain if the format string is a null pointer. See
the node "Function Attributes" in the GCC info pages if you don't
know what this is all about.
This change will allow us to add format string checking for the
err(3) family of functions.
non-i386, non-unix, and generatable files have been trimmed, but can easily
be added in later if needed.
gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's
handy to have both available for reference for such little cost.
The freebsd-specific changes will then be committed, and once the dust has
settled, the bmakefiles will be committed to use this code.
