Re: gl_CACHE_VAL_SILENT won't work correctly with upcoming autoconf 2.70

[Bruno Haible]

[CCing address@hidden]

Hi Zack,

> Abstractly, the best thing to do about this would be to remove the
> macro and change all of its uses to be AC_CACHE_CHECK, with proper
> messaging, instead.

The point is that we don't want messaging for some tests. Most people
find the 'configure' output already long enough.

The underlying problem in Autoconf is the following: There is a macro
AC_CACHE_CHECK that does messaging, and a macro AC_CACHE_VAL whose
main purpose is to make a cache lookup, not messaging, but it
nevertheless outputs '(cached)' strings occasionally.

Please fix this correctly
  - either by having AC_CACHE_VAL set some shell variable that
    AC_CACHE_CHECK will inspect after executing AC_CACHE_VAL,
  - or by introducing a macro that is like AC_CACHE_VAL but produces
    no spurious output.
Then AC_CACHE_VAL or the other macro is properly silent, and then no
gl_CACHE_VAL_SILENT will be needed any more.

Bruno