[PATCH v2] configure.ac: fix bashisms in configure.ac

[Sam James]

> On 22 Mar 2022, at 17:30, Adhemerval Zanella <adhemerval.zanella@linaro.org> wrote:
> 
> 
> 
> On 22/03/2022 14:11, 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
>> ```
>> 
>> Signed-off-by: Sam James <sam@gentoo.org>
> 
> I think you need to regenerate the powerpc64le configure as well.
> 

Pff:
Changes to be committed:
  (use "git restore --staged <file>..." to unstage)
	modified:   sysdeps/powerpc/powerpc64/le/configure
	modified:   sysdeps/powerpc/powerpc64/le/fpu/multiarch/configure

Let's fix that...

Best,
sam
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