what's up with _COMPILING_NEWLIB

Corinna Vinschen vinschen@redhat.com
Mon Nov 8 10:05:30 GMT 2021

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


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