Re: regex.m4 test too strict?

[Sam Steingold]

> * Paul Eggert <address@hidden> [2007-10-31 16:47:06 -0700]:
>
> Sam Steingold <address@hidden> writes:
>
>> incidentally, why isn't ac_use_included_regex cached?
>
> Typically we don't cache things that can be computed cheaply.  Can't
> it be computed cheaply, assuming gl_cv_func_re_compile_pattern_working
> is cached?

here is what I have in the subordinate configure.in

# ac_use_included_regex is NOT cached, so we have to duplicate the
# logic of src/glm4/regex.m4!
case $with_included_regex in
  yes|no) ac_use_included_regex=$with_included_regex ;;
  '') case $gl_cv_func_re_compile_pattern_working in
    yes) ac_use_included_regex=no;;
    no) ac_use_included_regex=yes;;
  esac ;;
esac

is this cheap?
and, more importantly, is this correct?!

note also that gl_cv_func_re_compile_pattern_working is not found by
"grep -i regex" ;-(

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