libtool adjust to improve win32 support

[r26057]

configure.ac

@@ -26,6 +26,9 @@ AC_DEFINE([libfirm_VERSION_MAJOR], [firm_major_version], [Firms major version nu
 AC_DEFINE([libfirm_VERSION_MINOR], [firm_minor_version], [Firms minor version number])
 AC_DEFINE([libfirm_VERSION_MICRO], [firm_micro_version], [Firms micro version number])
 
+dnl enable libtool
+LT_INIT([win32-dll])
+
 dnl generate the config header file
 AC_CONFIG_HEADER([config.h])
 
@@ -106,7 +109,6 @@ dnl ====================
 dnl check for a C compiler
 dnl ----------------------
 AC_PROG_CC
-AC_PROG_LIBTOOL
 
 AC_PATH_PROGS(PERL, perl perl5)
 

ir/Makefile.am

@@ -22,6 +22,7 @@ INCLUDES += \
 	-I$(top_srcdir)/ir/tr \
 	-I$(top_srcdir)/ir/tv
 
+libfirm_la_LDFLAGS = -no-undefined
 libfirm_la_SOURCES = \
 	adt/array.c \
 	adt/bipartite.c \