+ if test $gl_cv_func_remainder_no_libm = yes \
+ || test $gl_cv_func_remainder_in_libm = yes; then
+ :
+ m4_ifdef([gl_FUNC_REMAINDER_IEEE], [
+ if test $gl_remainder_required = ieee && test $REPLACE_REMAINDER = 0; then
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether remainder works according to ISO C 99 with IEC 60559],
+ [gl_cv_func_remainder_ieee],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $REMAINDER_LIBM"
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+/* Compare two numbers with ==.
+ This is a separate function because IRIX 6.5 "cc -O" miscompiles an
+ 'x == x' test. */
+static int
+numeric_equal (double x, double y)
+{
+ return x == y;
+}
+static double dummy (double x, double y) { return 0; }
+int main (int argc, char *argv[])
+{
+ double (*my_remainder) (double, double) = argc ? remainder : dummy;
+ double f;
+ /* Test remainder(...,0.0).
+ This test fails on OSF/1 5.1. */
+ f = my_remainder (2.0, 0.0);
+ if (numeric_equal (f, f))
+ return 1;
+ return 0;
+}
+ ]])],
+ [gl_cv_func_remainder_ieee=yes],
+ [gl_cv_func_remainder_ieee=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_remainder_ieee="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_remainder_ieee="guessing no" ;;
+ esac
+ ])
+ LIBS="$save_LIBS"
+ ])
+ case "$gl_cv_func_remainder_ieee" in
+ *yes) ;;
+ *) REPLACE_REMAINDER=1 ;;
+ esac
+ fi
+ ])
+ else