Use proper 'ar' program when cross-compiling or when AR is specified.

ChangeLog

@@ -1,3 +1,11 @@
+2016-11-26  Bruno Haible  <bruno@clisp.org>
+
+	Use proper 'ar' program when cross-compiling or when AR is specified.
+	* lib/configure.ac (AR): Determine through AC_CHECK_TOOL.
+	* lib/Makefile.in (AR): Use value determined by 'configure'.
+	Reported by György Andrasek <jurily@gmail.com>
+	at <http://lists.gnu.org/archive/html/bug-gperf/2014-04/msg00000.html>.
+
 2016-11-26  Bruno Haible  <bruno@clisp.org>
 
 	Avoid 'warning: cast from pointer to integer of different size'

lib/Makefile.in

@@ -41,7 +41,7 @@ CXXCPP = @CXXCPP@
 # Both C and C++ compiler
 OBJEXT = @OBJEXT@
 # Other
-AR = ar
+AR = @AR@
 AR_FLAGS = rc
 RANLIB = @RANLIB@
 MV = mv

lib/configure.ac

@@ -1,6 +1,6 @@
 dnl autoconf configuration for gperf/lib
 
-dnl Copyright (C) 1998, 2002, 2005, 2007, 2009 Free Software Foundation, Inc.
+dnl Copyright (C) 1998, 2002, 2005, 2007, 2009, 2016 Free Software Foundation, Inc.
 dnl Written by Douglas C. Schmidt <schmidt@ics.uci.edu>
 dnl and Bruno Haible <bruno@clisp.org>.
 dnl
@@ -33,6 +33,8 @@ AC_PROG_CXX
                       dnl sets variable CXX
 AC_PROG_CXXCPP
                       dnl sets variable CXXCPP
+AC_CHECK_TOOL([AR], [ar])
+                      dnl sets variable AR
 AC_PROG_RANLIB
                       dnl sets variable RANLIB
 CL_PROG_INSTALL