Merge GDB 7.5.1

gdb/gnulib/import/m4/warn-on-use.m4

-# warn-on-use.m4 serial 2
-dnl Copyright (C) 2010, 2011 Free Software Foundation, Inc.
+# warn-on-use.m4 serial 5
+dnl Copyright (C) 2010-2012 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.
 
 # gl_WARN_ON_USE_PREPARE(INCLUDES, NAMES)
 # ---------------------------------------
 # For each whitespace-separated element in the list of NAMES, define
 # HAVE_RAW_DECL_name if the function has a declaration among INCLUDES
 # even after being undefined as a macro.
 #
 # See warn-on-use.h for some hints on how to poison function names, as
 # well as ideas on poisoning global variables and macros.  NAMES may
 # include global variables, but remember that only functions work with
 # _GL_WARN_ON_USE.  Typically, INCLUDES only needs to list a single
 # header, but if the replacement header pulls in other headers because
 # some systems declare functions in the wrong header, then INCLUDES
 # should do likewise.
 #
-# If you assume C89, then it is generally safe to assume declarations
-# for functions declared in that standard (such as gets) without
+# It is generally safe to assume declarations for functions declared
+# in the intersection of C89 and C11 (such as printf) without
 # needing gl_WARN_ON_USE_PREPARE.
 AC_DEFUN([gl_WARN_ON_USE_PREPARE],
 [
   m4_foreach_w([gl_decl], [$2],
     [AH_TEMPLATE([HAVE_RAW_DECL_]AS_TR_CPP(m4_defn([gl_decl])),
       [Define to 1 if ]m4_defn([gl_decl])[ is declared even after
        undefining macros.])])dnl
+dnl FIXME: gl_Symbol must be used unquoted until we can assume
+dnl autoconf 2.64 or newer.
   for gl_func in m4_flatten([$2]); do
     AS_VAR_PUSHDEF([gl_Symbol], [gl_cv_have_raw_decl_$gl_func])dnl
     AC_CACHE_CHECK([whether $gl_func is declared without a macro],
       gl_Symbol,
       [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$1],
 [@%:@undef $gl_func
   (void) $gl_func;])],
         [AS_VAR_SET(gl_Symbol, [yes])], [AS_VAR_SET(gl_Symbol, [no])])])
-     AS_VAR_IF(gl_Symbol, [yes],
-       [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1])
+    AS_VAR_IF(gl_Symbol, [yes],
+      [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1])
        dnl shortcut - if the raw declaration exists, then set a cache
        dnl variable to allow skipping any later AC_CHECK_DECL efforts
        eval ac_cv_have_decl_$gl_func=yes])
     AS_VAR_POPDEF([gl_Symbol])dnl
   done
 ])