partly revert detection of broken float in configure
commit 80fbaac4cd1930e9545a5d36bf46ae49011d2ce8 broke all soft-float
archs, where gcc defines __GCC_IEC_559==0 because rounding modes and
exception flags are not supported. for now, just check for
__FAST_MATH__ as an indication of broken float. this won't detect all
possible misconfigurations but it probably catches the most common
one.
diff --git a/configure b/configure
index 779a3ef..0e36585 100755
--- a/configure
+++ b/configure
@@ -660,7 +660,7 @@
# for all packages. On recent GCC we can detect this and error out
# early rather than producing a seriously-broken math library.
#
-if trycppif "__FAST_MATH__ || (defined(__GCC_IEC_559) && __GCC_IEC_559==0)" \
+if trycppif "__FAST_MATH__" \
"$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
fail "$0: error: compiler has broken floating point; check CFLAGS"
fi