Hi Guys,
noted trying to rebuild guile 1.8.8.
The following piece of code in the past
was setting SCM_I_GSC_STACK_GROWS_UP=0
and now produces SCM_I_GSC_STACK_GROWS_UP=1
I assume some change in the gcc compiler is causing the issue.
I presume most of the programs and libraries do not care,
but some special one like guile crashes during build for this issue,
so be aware.
Regards
Marco
#--------------------------------------------------------------------
#
# Which way does the stack grow?
#
# Following code comes from Autoconf 2.61's internal _AC_LIBOBJ_ALLOCA
# macro (/usr/share/autoconf/autoconf/functions.m4). Gnulib has
# very similar code, so in future we could look at using that.
#
# An important detail is that the code involves find_stack_direction
# calling _itself_ - which means that find_stack_direction (or at
# least the second find_stack_direction() call) cannot be inlined.
# If the code could be inlined, that might cause the test to give
# an incorrect answer.
#--------------------------------------------------------------------
SCM_I_GSC_STACK_GROWS_UP=0
AC_RUN_IFELSE([AC_LANG_SOURCE(
[AC_INCLUDES_DEFAULT
int
find_stack_direction ()
{
static char *addr = 0;
auto char dummy;
if (addr == 0)
{
addr = &dummy;
return find_stack_direction ();
}
else
return (&dummy > addr) ? 1 : -1;
}
int
main ()
{
return find_stack_direction () < 0;
}])],
[SCM_I_GSC_STACK_GROWS_UP=1],
[],
[AC_MSG_WARN(Guessing that stack grows down -- see
scmconfig.h)])
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