[svn-r8009] Purpose:

    Bug fix

Description:
    Add special-case handling to floating-point conversion tests to avoid
problems with denormalized values on Cray T3E & T90 platforms.  (Still not
working on Cray SV1, but at least it's closer).

Solution:
    Detect denormalized values and don't try to operate on them on the Crays.

Platforms tested:
    FreeBSD 4.9 (sleipnir)
    Cray T3E (hubble.cray.com)
    Cray T90 (gypsy.cray.com)

1 files changed, 18 insertions, 1 deletions

diff --git a/configure.in b/configure.in
index c2e9ef8..df912a1 100644
--- a/configure.in
+++ b/configure.in
@@ -1647,7 +1647,7 @@ AC_MSG_RESULT([no]))
 dnl ----------------------------------------------------------------------
 dnl Check for functions.
 dnl
-AC_CHECK_FUNCS(fork gethostname getpwuid getrusage)
+AC_CHECK_FUNCS(fork frexpf frexpl gethostname getpwuid getrusage)
 AC_CHECK_FUNCS(BSDgettimeofday longjmp setsysinfo sigaction)
 AC_CHECK_FUNCS(signal snprintf vsnprintf strdup system waitpid)
 
@@ -2364,6 +2364,23 @@ if test 1 = 2; then
 fi
 
 dnl ----------------------------------------------------------------------
+dnl Set the flag to indicate that the machine can handle converting
+dnl denormalized floating-point values.
+dnl (This flag should be set for all machines, except for the Crays, where
+dnl the cache value is set in it's config file)
+dnl
+AC_MSG_CHECKING([if converting denormalized floating-point values is possible])
+AC_CACHE_VAL([hdf5_cv_convert_denormal_float], [hdf5_cv_convert_denormal_float=yes])
+
+if test ${hdf5_cv_convert_denormal_float} = "yes"; then
+  AC_DEFINE([CONVERT_DENORMAL_FLOAT], [1],
+            [Define if your system can handle converting denormalized floating-point values.])
+  AC_MSG_RESULT([yes])
+else
+  AC_MSG_RESULT([no])
+fi
+
+dnl ----------------------------------------------------------------------
 dnl Set some variables for general configuration information to be saved
 dnl and installed with the libraries.
 dnl