more [shadow] problems.
Fri May 26 17:39:00 GMT 2000
On Fri, May 26, 2000 at 10:46:55AM -0700, Steven King wrote:
> using the name.h form doesn't expose the non-standard names in the global
> namespace. ie
> #include <math.h>
> main ()
> // this doesnt work
> __exception e;
> matherr (&e);
> // this does
> _C_legacy::__exception e;
> _C_legacy::matherr (&e);
Feature, not bug. In fact, design goal.
When you #include a standard header, it's not supposed to stomp
all over the namespace and break your program. The vendors have
routinely ignored this, except Glibc. (It's also not supposed to
sub-include other standard headers -- at least C headers aren't.)
I might want to define my own "matherr()" function, and an ISO
standard conforming <math.h> has no authority to break it. In
fact, Glibc does protect matherr with __USE_SVID, and our shadow
header needs the same thing. This is not to say the declarations
shouldn't be there; it just means we have more work to do.
That's why we were talking about adding declarations of extensions,
girded about with "#ifdef __USE_GROTTY_EXTENSION".
ncm at cantrip dot org
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