On Sun, Sep 27, 2020 at 01:56:06PM -0500, Bob Friesenhahn wrote: > 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 "$ac_cv_have_C__func__" != 'yes' ; then > AC_CACHE_CHECK(for C compiler __func__ support, ac_cv_have_C__func__, > [AC_TRY_COMPILE( > , > changequote(<<, >>)dnl > << > const char *func=__func__; > return (func != 0 ? 0 : 1); > > > , For some reason there is an extra space in your email but I replicated the problem by deleting the space. > changequote([, ])dnl > ac_cv_have_C__func__='yes', > ac_cv_have_C__func__='no')]) > > if test "$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 Maybe it is a problem with changequote being used inside an argument to a macro. Does it work OK when you remove the changequote lines? if test "$ac_cv_have_C__func__" != 'yes' ; then AC_CACHE_CHECK(for C compiler __func__ support, ac_cv_have_C__func__, [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], << const char *func=__func__; return (func != 0 ? 0 : 1); >> ]])], [ac_cv_have_C__func__='yes'], [ac_cv_have_C__func__='no']])]) if test "$ac_cv_have_C__func__" = 'yes' ; then AC_DEFINE(HAS_C__func__,1,Define if C compiler supports __func__) fi fi Perhaps you could revert autoupdate's changes, try removing the changequote lines, check that the script still works, and then try autoupdate again and see if you have better results.
