[PATCH] configure.ac: fix bashism in configure.ac

[Sam James]

> On 22 Mar 2022, at 12:46, Adhemerval Zanella <adhemerval.zanella@linaro.org> wrote:
> 
> 
> 
> On 21/03/2022 20:03, 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>
> 
> There are other occurrences of this bashism as on other configure.ac:
> 
> sysdeps/powerpc/powerpc64/le/configure.ac:66:AS_IF([test "$libc_cv_compiler_powerpc64le_ldbl128_mabi" == "no"],
> sysdeps/powerpc/powerpc64/le/fpu/multiarch/configure.ac:12:AS_IF([[test "$libc_cv_mcpu_power10" == "yes"]],[
> 
> Should we fix it them as well?
> 

Thanks, I goofed up the grep. Fixed!

> Beside LGTM, thanks.
> 
> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

I forgot to add your tag on sending v2, but I didn't want to send a v3 for it (unless I should?)

Best,
sam
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