X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fgetusershell.m4;h=8aee912ba531bdb03c9ab1c07e80df52a6042761;hb=bbfcd2f1a92c9bdbb8d7d7d0a8a8c6665c316747;hp=de602d337030e215a9ffda198577d4799ccf9dbb;hpb=4fde4952d5a3db51a122f96a31bfcd6879399fea;p=gnulib.git

diff --git a/m4/getusershell.m4 b/m4/getusershell.m4
index de602d337..8aee912ba 100644
--- a/m4/getusershell.m4
+++ b/m4/getusershell.m4
@@ -1,10 +1,28 @@
-# getusershell.m4 serial 4
-dnl Copyright (C) 2002, 2003, 2006 Free Software Foundation, Inc.
+# getusershell.m4 serial 7
+dnl Copyright (C) 2002-2003, 2006, 2008-2013 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.
 
 AC_DEFUN([gl_FUNC_GETUSERSHELL],
 [
-  AC_REPLACE_FUNCS(getusershell)
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+
+  dnl Persuade glibc <unistd.h> to declare {get,set,end}usershell().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  dnl Check whether the getusershell function exists.
+  AC_CHECK_FUNCS_ONCE([getusershell])
+  if test $ac_cv_func_getusershell = yes; then
+    HAVE_GETUSERSHELL=1
+    dnl Check whether getusershell is declared.
+    AC_CHECK_DECLS([getusershell])
+    if test $ac_cv_have_decl_getusershell = no; then
+      HAVE_DECL_GETUSERSHELL=0
+    fi
+  else
+    HAVE_GETUSERSHELL=0
+    dnl Assume that on platforms which declare it, the function exists.
+    HAVE_DECL_GETUSERSHELL=0
+  fi
 ])