Fix cross link using autoconf detected AR

If building on 32bit host and creating 64bit libraries, the target
package builds should not invoke the 32bit hosts's ar.  Specifically
you will get an error message like:

x86_64-linux-gcc    -m64 --sysroot=/opt/qemux86-64/tmp/sysroots/qemux86-64 -g -o test test.o libnewt.a -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -lslang
libnewt.a: could not read symbols: Archive has no index; run ranlib to add one
collect2: error: ld returned 1 exit status

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>

Upstream-Status: Pending

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
---
 Makefile.in  | 3 ++-
 configure.ac | 4 ++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Makefile.in b/Makefile.in
--- a/Makefile.in
+++ b/Makefile.in
@@ -7,6 +7,7 @@ CFLAGS = @CFLAGS@
 LDFLAGS = @LDFLAGS@
 CPPFLAGS = -D_GNU_SOURCE @CPPFLAGS@ 
 GNU_LD = @GNU_LD@
+AR = @AR@
 
 VERSION = @VERSION@
 TAG = r$(subst .,-,$(VERSION))
@@ -109,7 +110,7 @@ whiptcl.$(SOEXT): $(WHIPTCLOBJS) $(LIBNEWTSH)
 	$(CC) -shared $(SHCFLAGS) $(LDFLAGS) -o whiptcl.$(SOEXT) $(WHIPTCLOBJS) -L. -lnewt  $(LIBTCL) -lpopt $(LIBS)
 
 $(LIBNEWT): $(LIBOBJS)
-	ar rv $@ $^
+	$(AR) rv $@ $^
 
 newt.o $(SHAREDDIR)/newt.o: newt.c Makefile
 
diff --git a/configure.ac b/configure.ac
index 92e6da8..cd83d57 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,6 +15,10 @@ AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_GREP
 AC_SYS_LARGEFILE
+AN_MAKEVAR([AR], [AC_PROG_AR])
+AN_PROGRAM([ar], [AC_PROG_AR])
+AC_DEFUN([AC_PROG_AR], [AC_CHECK_TOOL(AR, ar, :)])
+AC_PROG_AR
 
 # Are we using GNU ld?
 AC_MSG_CHECKING([for GNU ld])
-- 
1.8.1.2