what's up with _COMPILING_NEWLIB

[Mike Frysinger]

On 08 Nov 2021 11:05, Corinna Vinschen wrote:
> On Nov  6 20:21, Mike Frysinger wrote:
> > i stumbled across _COMPILING_NEWLIB and it seems to be what i want: a symbol
> > that indicates the code currently being compiled is newlib itself so that the
> > header can change behavior for that environment specifically.  is that what
> > it's meant for ?
> > 
> > if so, why does it seem to be inconsistently defined ?  newlib/configure.host
> > will add it for a few random targets, as does the mips-specific
> > newlib/libc/machine/mips/Makefile.am, as do a few specific winsup/cygwin/
> > files.  it feels like the patch below is what we should have.
> > 
> > if that's not what this is for, is there a define that has this meaning ?
> > in the glibc & gnulib world, the plain _LIBC define indicates this.
> 
> _COMPILING_NEWLIB might be older than that.  In Cygwin we certainly need
> it during build.  Your patch looks good to me, did you test it for some
> targets?

yes, i tested it for bfin-elf and with a change that needed it in ctype.h.
the ctype.h change didn't work until i updated the build this way.
-mike
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