-# trunc.m4 serial 7
-dnl Copyright (C) 2007, 2010-2011 Free Software Foundation, Inc.
+# trunc.m4 serial 9
+dnl Copyright (C) 2007, 2010-2013 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.
dnl Persuade glibc <math.h> to declare trunc().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether trunc() is declared.
- AC_CHECK_DECLS([trunc], , , [#include <math.h>])
+ AC_CHECK_DECLS([trunc], , , [[#include <math.h>]])
if test "$ac_cv_have_decl_trunc" = yes; then
dnl Test whether trunc() can be used without libm.
TRUNC_LIBM=?
fi
m4_ifdef([gl_FUNC_TRUNC_IEEE], [
if test $gl_trunc_required = ieee && test $REPLACE_TRUNC = 0; then
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether trunc works according to ISO C 99 with IEC 60559],
[gl_cv_func_trunc_ieee],
[
]])],
[gl_cv_func_trunc_ieee=yes],
[gl_cv_func_trunc_ieee=no],
- [gl_cv_func_trunc_ieee="guessing no"])
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_trunc_ieee="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_trunc_ieee="guessing no" ;;
+ esac
+ ])
LIBS="$save_LIBS"
])
case "$gl_cv_func_trunc_ieee" in