Re: pgsql: Fix compiler warning for ppoll() on Cygwin

I think the config.cache of lorikeet needs to be cleaned, because the 
return type of strerror_r() has changed as a result of this commit, but 
the build farm logs still show the old test result being used from the 
cache.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
On 2019-12-25 07:17, Tom Lane wrote:
> Peter Eisentraut <peter@eisentraut.org> writes:
>> Fix compiler warning for ppoll() on Cygwin
>> _GNU_SOURCE is required to get the prototype, so just define that
>> globally, as was already done in the linux template.
> 
> This seems to have broken lorikeet:
> 
> https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=lorikeet&dt=2019-12-23%2006%3A38%3A29
> 
> ================== pgsql.build/src/test/regress/regression.diffs ===================
> diff -U3 /home/andrew/bf64/root/HEAD/pgsql.build/src/test/regress/expected/create_function_1.out
/home/andrew/bf64/root/HEAD/pgsql.build/src/test/regress/results/create_function_1.out
> --- /home/andrew/bf64/root/HEAD/pgsql.build/src/test/regress/expected/create_function_1.out    2019-12-23
01:54:52.899453200-0500
 
> +++ /home/andrew/bf64/root/HEAD/pgsql.build/src/test/regress/results/create_function_1.out    2019-12-23
01:55:58.318974000-0500
 
> @@ -90,7 +90,7 @@
>   ERROR:  only one AS item needed for language "sql"
>   CREATE FUNCTION test1 (int) RETURNS int LANGUAGE C
>       AS 'nosuchfile';
> -ERROR:  could not access file "nosuchfile": No such file or directory
> +ERROR:  could not access file "nosuchfile": ENOENT
>   CREATE FUNCTION test1 (int) RETURNS int LANGUAGE C
>       AS '/home/andrew/bf64/root/HEAD/pgsql.build/src/test/regress/regress.dll', 'nosuchsymbol';
>   ERROR:  could not find function "nosuchsymbol" in file
"/home/andrew/bf64/root/HEAD/pgsql.build/src/test/regress/regress.dll"
> 
> I'm guessing that this broke something in the #ifdef nest in
> gnuish_strerror_r(), causing it to fail, causing pg_strerror_r()
> to fall back to using get_errno_symbol().
> 
>             regards, tom lane
>