v0_8: disable lxt support if libbzip2 is not found.

Configure was checking for libbzip2, but it was not doing anything with
the result. This patch disables lxt support if libbzip2 is not found.

configure.in

@@ -59,9 +59,12 @@ AC_CHECK_LIB(z, gzwrite, HAVE_LIBZ=yes, HAVE_LIBZ=no)
 AC_SUBST(HAVE_LIBZ)
 if test "$WIN32" = "yes"; then
 AC_CHECK_LIB(bz2, main)
+AC_CHECK_LIB(bz2, main, HAVE_LIBBZ2=yes, HAVE_LIBBZ2=no)
 else
 AC_CHECK_LIB(bz2, BZ2_bzdopen)
+AC_CHECK_LIB(bz2, BZ2_bzdopen, HAVE_LIBBZ2=yes, HAVE_LIBBZ2=no)
 fi
+AC_SUBST(HAVE_LIBBZ2)
 
 AC_MSG_CHECKING(for sys/times)
 AC_TRY_LINK(

vpi/Makefile.in

@@ -69,7 +69,10 @@ sys_readmem.o sys_readmem_lex.o \
 sys_time.o sys_vcd.o sys_vcdoff.o vcd_priv.o mt19937int.o priv.o stringheap.o
 
 ifeq (@HAVE_LIBZ@,yes)
-O += sys_lxt.o lxt_write.o sys_lxt2.o lxt2_write.o
+ifeq (@HAVE_LIBBZ2@,yes)
+O += sys_lxt.o lxt_write.o
+endif
+O += sys_lxt2.o lxt2_write.o
 endif
 
 LIBS = @LIBS@

vpi/configure.in

@@ -35,9 +35,12 @@ AC_CHECK_LIB(z, gzwrite, HAVE_LIBZ=yes, HAVE_LIBZ=no)
 AC_SUBST(HAVE_LIBZ)
 if test "$WIN32" = "yes"; then
 AC_CHECK_LIB(bz2, main)
+AC_CHECK_LIB(bz2, main, HAVE_LIBBZ2=yes, HAVE_LIBBZ2=no)
 else
 AC_CHECK_LIB(bz2, BZ2_bzdopen)
+AC_CHECK_LIB(bz2, BZ2_bzdopen, HAVE_LIBBZ2=yes, HAVE_LIBBZ2=no)
 fi
+AC_SUBST(HAVE_LIBBZ2)
 
 # --
 # Look for a dl library to use. First look for the standard dlopen

vpi/sys_table.c

@@ -40,7 +40,11 @@ extern void sys_vcd_register();
 extern void sys_vcdoff_register();
 
 #ifdef HAVE_LIBZ
+#ifdef HAVE_LIBBZ2
 extern void sys_lxt_register();
+#else
+static void sys_lxt_register() { fputs("LXT support disabled since libbzip2 not available\n",stderr); exit(1); }
+#endif
 extern void sys_lxt2_register();
 #else
 static void sys_lxt_register() { fputs("LXT support disabled since zlib not available\n",stderr); exit(1); }