run one test

[Szabolcs Nagy]

On 25/09/2019 21:41, DJ Delorie wrote:
> 
> One of the small items that was mentioned at Cauldron was "how do to
> re-run just one test?"
> 
> While it can be done with a suitable command line make invocation,
> this is a lot easier...

looks useful to me.

unfortunately there is currently no easy way to
discover such make targets. (maybe there could be a
make target that prints out usage information for
the most commonly used make targets)

it can be convenient to rerun a set of tests too, e.g.
by providing a list or pattern like 'math/test-double-*',
which can be implemented in a similar way.

same for benchmarks.

for now the proposed patch looks good enough though.

> 
> I'll turn it into a real patch once we bikeshed the target name ;-)
> 
> diff --git a/Makefile b/Makefile
> index 67ddd01bfe..c424d9ee02 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -499,3 +499,11 @@ FORCE:
>  
>  iconvdata/% localedata/% po/%: FORCE
>  	$(MAKE) $(PARALLELMFLAGS) -C $(@D) $(@F)
> +
> +# Convenience target to rerun one test, from the top of the build tree
> +# Example: make onetest t=wcsmbs/test-wcsnlen
> +onetest :
> +	@-rm -f $(objpfx)$t.out
> +	$(MAKE) subdir=$(dir $t) -C $(dir $t) ..=../ $(objpfx)$t.out
> +	@cat $(objpfx)$t.test-result
> +	@cat $(objpfx)$t.out
>