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 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,
-AC_DEFUN([gl_SIGNBIT_TEST_PROGRAM], [
+AC_DEFUN([gl_SIGNBIT_TEST_PROGRAM], [[
+/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
+ So we use -p0f and -p0d instead. */