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Re: [PATCH] Optimize sprintf(buffer,"foo")


On Mon, 23 Jun 2003, Jakub Jelinek wrote:

> Then, if we have some way to find out at compile time the target platform
> provides stpcpy in libc (dunno whether explicit stpcpy prototype would
> be enough or whether we need some #pragma or whatever),

We'd actually like also to know whether the target provides __stpcpy in
libc since ISO C programs could redefine stpcpy.

I'd like a general mechanism by which a libc header file can be included
at the start of all compilations if it exists (and silently ignored if it
doesn't), to get the definition of __STDC_ISO_10646__ (which describes
libc features but must be available for the whole translation unit) right.
Perhaps such a header could also contain pragmas like "#pragma GCC
libc_provides stpcpy".

(Such a header of course must _only_ have such macros and pragmas - it
can't include any other glibc headers that test feature test macros, as
those may be defined in the source file at any point before it includes
standard headers.)

-- 
Joseph S. Myers
jsm28@cam.ac.uk


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