Re: [patch #7320] AX_BLAS: AC_CHECK_FUNC autocaching makes problems

[Steven G. Johnson]

> In AX_BLAS, AC_CHECK_FUNC is used to check for SGEMM. The problem is  
> that
> AC_CHECK_FUNC autocaches its result, but the LIBS are being  
> manipulated, so
> the cache is not valid after the test and can fool subsequent tests.  
> For a
> real occurrence of the problem, see
> https://savannah.gnu.org/bugs/index.php?31046
>
> The attached patch replaces AC_CHECK_FUNC calls by AC_TRY_LINK_FUNC,  
> which
> does not autocache.

Thanks for the patch, in principle this looks good.

As a cosmetic issue, however, it looks like you need to call  
AC_MSG_RESULT to print out a message from the tests: call  
AC_MSG_RESULT(yes) if it succeeds, and ...(no) if it fails.

Steven