Greetings,
Here's a little m4 snippet you can stick into configure.in or .ac (from
my PETSc package's math-blaslapack.m4):
AC_DEFUN([ALPHA_MIEEE_CHECK],[
AC_CHECKING([whether -mieee is needed to avoid SIGFPE on divide by
zero])
case $build/$CC in
alpha*/gcc* )
MIEEE_CFLAGS="-mieee"
AC_MSG_RESULT([yes])
;;
* )
MIEEE_CFLAGS=""
AC_MSG_RESULT([not needed])
;;
esac
AC_SUBST(MIEEE_CFLAGS)
])
Then you just add MIEEE_CFLAGS to CFLAGS, CXXFLAGS etc.
On Mon, 2004-02-09 at 12:18, Dominique Devriese wrote:
package konqueror
reopen 203722
thanks
Steve Langasek writes:
>> I'm currently looking at the following bug report
>> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=203722 about a
>> frequent SIGFPE on an alpha machine. I guess we all know the cause
>> of this bug, namely the non-standard alpha FPU semantics.
> Even if gcc will soon adopt a patch to make -mieee the default,
> there will be older versions of gcc around for a while. This is a
> bug *now*, and there's no reason not to add the -mieee explicitly to
> the compiler flags for the time being: it will just become a no-op
> later once this is the gcc default.
I guess I'm in the minority (based on prior discussions on
debian-alpha), but IMHO the above is a better way to work around this
issue than making slower performance the default... :-)
Cheers,
--
-Adam P.
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