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* acconfig.h: added BROKEN_GCSE.

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* configure.in: check for a gcc GCSE optimisation bug.
This commit is contained in:
Gary Houston 2000-08-18 22:44:12 +00:00
parent 005b59783e
commit aec1eb3048
2 changed files with 30 additions and 0 deletions
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3
acconfig.h
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@ -154,3 +154,6 @@
/* Define if the compiler supports long longs. */
#undef HAVE_LONG_LONGS
/* Define if GCC has GCSE optimisation bug. */
#undef BROKEN_GCSE

27
configure.in
View file

@ -129,6 +129,33 @@ if test "$scm_cv_long_longs" = yes; then
AC_DEFINE(HAVE_LONG_LONGS)
fi
dnl check for an optimisation problem which is present in some versions
dnl of gcc, including 2.95.2.
AC_MSG_CHECKING(for broken GCSE optimisation)
AC_CACHE_VAL(guile_cv_broken_gcse,
AC_TRY_RUN([
int main ()
{
long winds = 0;
while (winds != 0)
{
if (*(char *) 0)
break;
}
if (winds == 0 || *(char *) 0)
exit (0);
return 0;
}],
guile_cv_broken_gcse=no, guile_cv_broken_gcse=yes,
guile_cv_broken_gcse=yes))
AC_MSG_RESULT($guile_cv_broken_gcse)
if test $guile_cv_broken_gcse = yes; then
AC_DEFINE(BROKEN_GCSE)
fi
AC_HEADER_STDC
AC_HEADER_DIRENT
AC_HEADER_TIME