[Bug bootstrap/80677] LIMITS_H_TEST is wrong

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80677

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Mon, 8 May 2017, helmut at subdivi dot de wrote:

> False negatives: Debian is about to further multiarch. That involves moving
> libc headers from /usr/include to /usr/include/$(DEB_HOST_MULTIARCH) as libc
> headers can differ for different libc implementations (glibc/musl/uclibc). Thus
> the test will wrongly fail even for libcs that provide a limits.h.

Well, if headers move then configure (and related) tests that look at them 
will need updating.  See how gcc/configure.ac looks in $target_header_dir 
to identify the glibc version and various other configuration, for 
example.