Re: autoconf-2.69c released [beta]

[Bob Friesenhahn]

On Sun, 27 Sep 2020, Gavin Smith wrote:
> It might help if you could post what the AC_TRY_COMPILE statements were
> changed into.  If I understand correctly the definition in
> autoconf/general.m4

That would certainly help and it is perhaps likely that there is some 
syntax weakness in the original.  See below.

Since the problem also occurs with Autoconf 2.69 autoupdate, that is 
what I use for the test case.

Input:

# Test for C compiler __func__ support
if test "$ac_cv_have_C__func__" != 'yes' ; then
AC_CACHE_CHECK(for C compiler __func__ support, ac_cv_have_C__func__,
[AC_TRY_COMPILE(
,
changequote(<<, >>)dnl
<<
const char *func=__func__;
return (func != 0 ? 0 : 1);
> > ,
changequote([, ])dnl
ac_cv_have_C__func__='yes',
ac_cv_have_C__func__='no')])

if test "$ac_cv_have_C__func__" = 'yes' ; then
 AC_DEFINE(HAS_C__func__,1,Define if C compiler supports __func__)
fi
fi

After Autoconf 2.69 autoupdate:

# Test for C compiler __func__ support
if test "$ac_cv_have_C__func__" != 'yes' ; then
AC_CACHE_CHECK(for C compiler __func__ support, ac_cv_have_C__func__,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[changequote(<<, >>)dnl
<<
const char *func=__func__;
return (func != 0 ? 0 : 1);
> > ]])],[changequote(, )dnl
ac_cv_have_C__func__='yes'],[ac_cv_have_C__func__='no'])])

if test "$ac_cv_have_C__func__" = 'yes' ; then
 AC_DEFINE(HAS_C__func__,1,Define if C compiler supports __func__)
fi
fi

Bob
--
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
Public Key,     http://www.simplesystems.org/users/bfriesen/public-key.txt