[PATCH v3] configure.ac: fix bashisms in configure.ac

[Mike Frysinger]

On 22 Mar 2022 17:33, Sam James via Libc-alpha wrote:
> configure scripts need to be runnable with a POSIX-compliant /bin/sh.
> 
> On many (but not all!) systems, /bin/sh is provided by Bash, so errors
> like this aren't spotted. Notably Debian defaults to /bin/sh provided
> by dash which doesn't tolerate such bashisms as '=='.
> 
> This retains compatibility with bash.
> 
> Fixes configure warnings/errors like:
> ```
> checking if compiler warns about alias for function with incompatible types... yes
> /var/tmp/portage/sys-libs/glibc-2.34-r10/work/glibc-2.34/configure: 4209: test: xyes: unexpected operator
> ```

lgtm, pushed!
-mike
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <https://sourceware.org/pipermail/libc-alpha/attachments/20220322/39e86392/attachment.sig>