* data/glr.c (b4_shared_declarations): Put start-header first,

before any #includes that we generate, so that feature-test
macros work.  Problem reported by Michael Deutschmann in
<http://lists.gnu.org/archive/html/bug-bison/2006-09/msg00004.html>.
* data/lalr1.cc: Likewise.
* doc/bison.texinfo (Prologue): Document that feature-test macros
should be defined before any Bison declarations.
* tests/actions.at (_AT_CHECK_PRINTER_AND_DESTRUCTOR): Put defns
that depend on location.hh after, not before, Bison decls, since
we now include location.hh after the first user prologue.

data/glr.cc

@@ -221,6 +221,10 @@ b4_copyright([Skeleton interface for Bison GLR parsers in C++],
 #ifndef PARSER_HEADER_H
 # define PARSER_HEADER_H
 
+]m4_ifdef([b4_start_header],
+[[/* Copy the %start-header blocks.  */
+]b4_user_start_header])[
+
 #include <string>
 #include <iostream>
 
@@ -233,10 +237,6 @@ namespace ]b4_namespace[
   class location;
 }
 
-]m4_ifdef([b4_start_header],
-[[/* Copy the %start-header blocks.  */
-]b4_user_start_header])[
-
 #include "location.hh"
 
 /* Enabling traces.  */