+ m4_ifdef([gl_FUNC_CEILF_IEEE], [
+ if test $gl_ceilf_required = ieee && test $REPLACE_CEILF = 0; then
+ AC_CACHE_CHECK([whether ceilf works according to ISO C 99 with IEC 60559],
+ [gl_cv_func_ceilf_ieee],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $CEILF_LIBM"
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+]gl_FLOAT_MINUS_ZERO_CODE[
+]gl_FLOAT_SIGNBIT_CODE[
+int main()
+{
+ /* Test whether ceilf (-0.0f) is -0.0f. */
+ if (signbitf (minus_zerof) && !signbitf (ceilf (minus_zerof)))
+ return 1;
+ return 0;
+}
+ ]])],
+ [gl_cv_func_ceilf_ieee=yes],
+ [gl_cv_func_ceilf_ieee=no],
+ [gl_cv_func_ceilf_ieee="guessing no"])
+ LIBS="$save_LIBS"
+ ])
+ case "$gl_cv_func_ceilf_ieee" in
+ *yes) ;;
+ *) REPLACE_CEILF=1 ;;
+ esac
+ fi
+ ])