Re: regex no longer needs to depend on malloc-gnu

[Nathan Kennedy]

On 4/18/2014 1:44 AM, Paul Eggert wrote:
> > the MALLOC_0_IS_NONNULL macro attempting to check for
> > malloc(0) failure is not needed.
> It's not needed for correctness, but it helps performance on GNU 
> hosts, no?  It lets them avoid an unnecessary test "size != 0" at 
> runtime.  The MALLOC_0_IS_NONNULL test is done at compile-time, and 
> has no runtime overhead.
If saving that one test is worth the risk that MALLOC_0_IS_NONNULL will 
always be correctly be defined, e.g. that this will never always be true 
for all potential users:

+#ifdef _LIBC
+# define MALLOC_0_IS_NONNULL 1

uClibc defines it too:
libc-symbols.h:#define _LIBC    1

Nathan