When cross-compiling, I also see this wrong guess:
checking whether gettimeofday clobbers localtime buffer... yes
This proposed patch should improve it. OK to apply, Jim & Paul?
2012-05-01 Bruno Haible <br...@clisp.org>
gettimeofday: Avoid bad guess when cross-compiling to glibc systems.
* m4/gettimeofday.m4 (gl_FUNC_GETTIMEOFDAY_CLOBBER): Require
AC_CANONICAL_HOST. When cross-compiling, guess no on glibc platforms.
--- m4/gettimeofday.m4.orig Wed May 2 00:04:14 2012
+++ m4/gettimeofday.m4 Wed May 2 00:04:11 2012
@@ -1,4 +1,4 @@
-# serial 18
+# serial 19
# Copyright (C) 2001-2003, 2005, 2007, 2009-2012 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
@@ -82,6 +82,7 @@
AC_DEFUN([gl_FUNC_GETTIMEOFDAY_CLOBBER],
[
AC_REQUIRE([gl_HEADER_SYS_TIME_H])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer],
[gl_cv_func_gettimeofday_clobber],
@@ -104,15 +105,23 @@
]])],
[gl_cv_func_gettimeofday_clobber=no],
[gl_cv_func_gettimeofday_clobber=yes],
- dnl When crosscompiling, assume it is broken.
- [gl_cv_func_gettimeofday_clobber=yes])])
-
- if test $gl_cv_func_gettimeofday_clobber = yes; then
- REPLACE_GETTIMEOFDAY=1
- gl_GETTIMEOFDAY_REPLACE_LOCALTIME
- AC_DEFINE([GETTIMEOFDAY_CLOBBERS_LOCALTIME], [1],
- [Define if gettimeofday clobbers the localtime buffer.])
- fi
+ [# When cross-compiling:
+ case "$host_os" in
+ # Guess all is fine on glibc systems.
+ *-gnu*) gl_cv_func_gettimeofday_clobber="guessing no" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_gettimeofday_clobber="guessing yes" ;;
+ esac
+ ])])
+
+ case "$gl_cv_func_gettimeofday_clobber" in
+ *yes)
+ REPLACE_GETTIMEOFDAY=1
+ gl_GETTIMEOFDAY_REPLACE_LOCALTIME
+ AC_DEFINE([GETTIMEOFDAY_CLOBBERS_LOCALTIME], [1],
+ [Define if gettimeofday clobbers the localtime buffer.])
+ ;;
+ esac
])
AC_DEFUN([gl_GETTIMEOFDAY_REPLACE_LOCALTIME], [
