-# truncl.m4 serial 1
-dnl Copyright (C) 2007 Free Software Foundation, Inc.
+# truncl.m4 serial 2
+dnl Copyright (C) 2007-2008 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_TRUNCL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl Persuade glibc <math.h> to declare truncl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether truncl() is declared.
if test "$TRUNCL_LIBM" = "?"; then
TRUNCL_LIBM=
fi
+ dnl Test whether truncl() works. It crashes on OSF/1 4.0d.
+ AC_CACHE_CHECK([whether truncl works], [gl_cv_func_truncl_works],
+ [
+ AC_TRY_RUN([
+#include <math.h>
+long double x;
+int main()
+{
+ x = truncl (0.0L);
+ return 0;
+}], [gl_cv_func_truncl_works=yes], [gl_cv_func_truncl_works=no],
+ [case "$host_os" in
+ osf4*) gl_cv_func_truncl_works="guessing no";;
+ *) gl_cv_func_truncl_works="guessing yes";;
+ esac
+ ])
+ ])
+ case "$gl_cv_func_truncl_works" in
+ *yes) ;;
+ *) REPLACE_TRUNCL=1 ;;
+ esac
else
- HAVE_DECL_TRUNCL=0
+ REPLACE_TRUNCL=1
+ fi
+ if test $REPLACE_TRUNCL = 1; then
AC_LIBOBJ([truncl])
TRUNCL_LIBM=
fi
- AC_SUBST([HAVE_DECL_TRUNCL])
+ AC_SUBST([REPLACE_TRUNCL])
AC_SUBST([TRUNCL_LIBM])
])