Move tst-signal-numbers to Python

[Joseph Myers]

On Mon, 10 Dec 2018, Florian Weimer wrote:

> I would expect something not based on regular expression for those
> filters, and it's odd there are two of them.  I don't think using two
> filters does not include expressiveness here.
> 
>     re_signal_macro = re.compile(r'^SIG[A-Z].*')
>     ignored_macros = set("SIGCLD SIGIOT SIGSWI SIGUNUSED"
>                          " SIGSTKSZ SIGRTMIN SIGRTMAX".split())
>     def signal_macro(name):
>       return re_signal_macro.match(name) and name not in ignored_macros

I don't want to require separate Python code for each such test.  Once 
there are a few more such tests, I think it will become natural to have a 
single Python script that reads text files describing the headers and 
constants to compare - with separate Python code only for more unusual 
cases.

I think having a regular expression to describe macros to include, and one 
to describe those to exclude, naturally matches multiple use cases for 
such tests.  Consider e.g. a test for MAP_* macros, which might compare 
MAP_[A-Z].* but exclude MAP_HUGE_[0-9].* from the comparison, without 
wanting to list all the macros such as MAP_HUGE_256MB individually.  
(That's an example of a case that will also need a kernel version to be 
specified, so that extra macros are allowed on the glibc side if the 
kernel headers are older, and extra macros are allowed on the kernel side 
if the kernel headers are newer.)

-- 
Joseph S. Myers
joseph@codesourcery.com