+ dnl Test whether truncl() works. It crashes on OSF/1 4.0d.
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $TRUNCL_LIBM"
+ AC_CACHE_CHECK([whether truncl works], [gl_cv_func_truncl_works],
+ [
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <math.h>
+long double x;
+int main()
+{
+ x = truncl (0.0L);
+ return 0;
+}]])],
+ [gl_cv_func_truncl_works=yes],
+ [gl_cv_func_truncl_works=no],
+ [case "$host_os" in
+ osf4*) gl_cv_func_truncl_works="guessing no";;
+ *) gl_cv_func_truncl_works="guessing yes";;
+ esac
+ ])
+ ])
+ LIBS="$save_LIBS"
+ case "$gl_cv_func_truncl_works" in
+ *yes) ;;
+ *) REPLACE_TRUNCL=1 ;;
+ esac
+ m4_ifdef([gl_FUNC_TRUNCL_IEEE], [
+ if test $gl_truncl_required = ieee && test $REPLACE_TRUNCL = 0; then
+ AC_CACHE_CHECK([whether truncl works according to ISO C 99 with IEC 60559],
+ [gl_cv_func_truncl_ieee],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $TRUNCL_LIBM"
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+]gl_LONG_DOUBLE_MINUS_ZERO_CODE[
+]gl_LONG_DOUBLE_SIGNBIT_CODE[
+int main()
+{
+ /* Test whether truncl (-0.3L) is -0.0L. */
+ if (signbitl (minus_zerol) && !signbitl (truncl (-0.3L)))
+ return 1;
+ return 0;
+}
+ ]])],
+ [gl_cv_func_truncl_ieee=yes],
+ [gl_cv_func_truncl_ieee=no],
+ [gl_cv_func_truncl_ieee="guessing no"])
+ LIBS="$save_LIBS"
+ ])
+ case "$gl_cv_func_truncl_ieee" in
+ *yes) ;;
+ *) REPLACE_TRUNCL=1 ;;
+ esac
+ fi
+ ])