memchr: detect broken x86_64 and alpha implementations

[gnulib.git] / m4 / sys_select_h.m4

diff --git a/m4/sys_select_h.m4 b/m4/sys_select_h.m4
index 7fe67df..c48be2c 100644 (file)
--- a/m4/sys_select_h.m4
+++ b/m4/sys_select_h.m4
@@ -1,15 +1,18 @@
-# sys_select_h.m4 serial 2
-dnl Copyright (C) 2006-2007 Free Software Foundation, Inc.
+# sys_select_h.m4 serial 7
+dnl Copyright (C) 2006-2009 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_HEADER_SYS_SELECT],
 [
+  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_REQUIRE([gl_SYS_SELECT_H_DEFAULTS])
   AC_CACHE_CHECK([whether <sys/select.h> is self-contained],
     [gl_cv_header_sys_select_h_selfcontained],
     [
-      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/select.h>], [])],
+      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/select.h>]],
+                                        [[struct timeval b;]])],
         [gl_cv_header_sys_select_h_selfcontained=yes],
         [gl_cv_header_sys_select_h_selfcontained=no])
     ])
@@ -17,16 +20,28 @@ AC_DEFUN([gl_HEADER_SYS_SELECT],
     SYS_SELECT_H=''
   else
     SYS_SELECT_H='sys/select.h'
-    AC_CHECK_HEADERS([sys/select.h])
-    gl_ABSOLUTE_HEADER([sys/select.h])
-    ABSOLUTE_SYS_SELECT_H=\"$gl_cv_absolute_sys_select_h\"
-    AC_SUBST([ABSOLUTE_SYS_SELECT_H])
+    gl_CHECK_NEXT_HEADERS([sys/select.h])
     if test $ac_cv_header_sys_select_h = yes; then
       HAVE_SYS_SELECT_H=1
     else
       HAVE_SYS_SELECT_H=0
     fi
     AC_SUBST([HAVE_SYS_SELECT_H])
+    gl_PREREQ_SYS_H_WINSOCK2
   fi
   AC_SUBST([SYS_SELECT_H])
 ])
+
+AC_DEFUN([gl_SYS_SELECT_MODULE_INDICATOR],
+[
+  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
+  AC_REQUIRE([gl_SYS_SELECT_H_DEFAULTS])
+  GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
+])
+
+AC_DEFUN([gl_SYS_SELECT_H_DEFAULTS],
+[
+  GNULIB_SELECT=0; AC_SUBST([GNULIB_SELECT])
+  dnl Assume proper GNU behavior unless another module says otherwise.
+  REPLACE_SELECT=0; AC_SUBST([REPLACE_SELECT])
+])