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Ask for IEEE floating point behavior on Alpha and SH.

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* configure.in (CPPFLAGS): Add `-mieee' or `-ieee' on Alpha and SH.

* libguile/numbers.c (guile_ieee_init): Make sure `-mieee' was passed
  when using GCC on Alpha.

* NEWS: Update.
This commit is contained in:
Ludovic Courtès 2009-05-11 22:11:25 +02:00
parent e9c9fd3d99
commit cabfe198fd
3 changed files with 42 additions and 0 deletions
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1
NEWS
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@ -15,6 +15,7 @@ Changes in 1.8.7 (since 1.8.6)
** Fix build problem when scm_t_timespec is different from struct timespec ** Fix build problem when scm_t_timespec is different from struct timespec
** Fix build when compiled with -Wundef -Werror ** Fix build when compiled with -Wundef -Werror
** More build fixes for `alphaev56-dec-osf5.1b' (Tru64) ** More build fixes for `alphaev56-dec-osf5.1b' (Tru64)
** With GCC, always compile with `-mieee' on `alpha*' and `sh*'
** Allow @ macro to work with (ice-9 syncase) ** Allow @ macro to work with (ice-9 syncase)

34
configure.in
View file

@ -222,6 +222,40 @@ case "$use_64_calls" in
;; ;;
esac esac
AC_MSG_CHECKING([whether the compiler defaults to IEEE floating point behavior])
# The following snippet was taken from Gnulib's `fpieee'. See also the definition
# of `guile_NaN' in `numbers.c'.
# IEEE behaviour is the default on all CPUs except Alpha and SH
# (according to the test results of Bruno Haible's ieeefp/fenv_default.m4
# and the GCC 4.1.2 manual).
case "$host_cpu" in
alpha*)
# On Alpha systems, a compiler option provides the behaviour.
# See the ieee(3) manual page, also available at
# <http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/V51B_HTML/MAN/MAN3/0600____.HTM>
AC_MSG_RESULT([no])
if test -n "$GCC"; then
# GCC has the option -mieee.
CPPFLAGS="$CPPFLAGS -mieee"
else
# Compaq (ex-DEC) C has the option -ieee.
CPPFLAGS="$CPPFLAGS -ieee"
fi
;;
sh*)
AC_MSG_RESULT([no])
if test -n "$GCC"; then
# GCC has the option -mieee.
CPPFLAGS="$CPPFLAGS -mieee"
fi
;;
*)
AC_MSG_RESULT([yes])
;;
esac
#-------------------------------------------------------------------- #--------------------------------------------------------------------
dnl Check for dynamic linking dnl Check for dynamic linking

7
libguile/numbers.c
View file

@ -637,6 +637,13 @@ guile_ieee_init (void)
#if defined (HAVE_ISNAN) #if defined (HAVE_ISNAN)
#if defined __GNUC__ && defined __alpha__ && !defined _IEEE_FP
/* On Alpha GCC must be passed `-mieee' to provide proper NaN handling.
See http://lists.gnu.org/archive/html/bug-gnulib/2009-05/msg00010.html
for more details. */
# error NaN handling will not work when compiling without -mieee
#endif
#ifdef NAN #ifdef NAN
/* C99 NAN, when available */ /* C99 NAN, when available */
guile_NaN = NAN; guile_NaN = NAN;