tools: drop bogus and obsolete ptyfuncs.m4

According to openpty(3) it is required to include <pty.h> to get the
prototypes for openpty() and login_tty(). But this is not what the
function AX_CHECK_PTYFUNCS actually does. It makes no attempt to include
the required header.

The two source files which call openpty() and login_tty() already contain
the conditionals to include the required header.

Remove the bogus m4 file to fix build with clang, which complains about
calls to undeclared functions.

Remove usage of INCLUDE_LIBUTIL_H in libxl_bootloader.c, it is already
covered by inclusion of libxl_osdep.h.

Remove usage of PTYFUNCS_LIBS in libxl/Makefile, it is already covered
by UTIL_LIBS from config/StdGNU.mk.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
(cherry picked from commit 42abf5b9c5)

config/Tools.mk.in

@@ -30,8 +30,6 @@ PTHREAD_CFLAGS      := @PTHREAD_CFLAGS@
 PTHREAD_LDFLAGS     := @PTHREAD_LDFLAGS@
 PTHREAD_LIBS        := @PTHREAD_LIBS@
 
-PTYFUNCS_LIBS       := @PTYFUNCS_LIBS@
-
 LIBNL3_LIBS         := @LIBNL3_LIBS@
 LIBNL3_CFLAGS       := @LIBNL3_CFLAGS@
 XEN_TOOLS_RPATH     := @rpath@

m4/ptyfuncs.m4

@@ -1,35 +0,0 @@
-AC_DEFUN([AX_CHECK_PTYFUNCS], [
-    dnl This is a workaround for a bug in Debian package
-    dnl libbsd-dev-0.3.0-1. Once we no longer support that
-    dnl package we can remove the addition of -Werror to
-    dnl CPPFLAGS.
-    AX_SAVEVAR_SAVE(CPPFLAGS)
-    CPPFLAGS="$CPPFLAGS -Werror"
-    AC_CHECK_HEADER([libutil.h],[
-      AC_DEFINE([INCLUDE_LIBUTIL_H],[<libutil.h>],[libutil header file name])
-    ])
-    AX_SAVEVAR_RESTORE(CPPFLAGS)
-    AC_CACHE_CHECK([for openpty et al], [ax_cv_ptyfuncs_libs], [
-        for ax_cv_ptyfuncs_libs in -lutil "" NOT_FOUND; do
-            if test "x$ax_cv_ptyfuncs_libs" = "xNOT_FOUND"; then
-                AC_MSG_FAILURE([Unable to find library for openpty and login_tty])
-            fi
-            AX_SAVEVAR_SAVE(LIBS)
-            LIBS="$LIBS $ax_cv_ptyfuncs_libs"
-            AC_LINK_IFELSE([AC_LANG_SOURCE([
-#ifdef INCLUDE_LIBUTIL_H
-#include INCLUDE_LIBUTIL_H
-#endif
-int main(void) {
-  openpty(0,0,0,0,0);
-  login_tty(0);
-}
-])],[
-                break
-            ],[])
-            AX_SAVEVAR_RESTORE(LIBS)
-        done
-    ])
-    PTYFUNCS_LIBS="$ax_cv_ptyfuncs_libs"
-    AC_SUBST(PTYFUNCS_LIBS)
-])

tools/config.h.in

@@ -90,9 +90,6 @@
 /* Define extfs header to use */
 #undef INCLUDE_EXTFS_H
 
-/* libutil header file name */
-#undef INCLUDE_LIBUTIL_H
-
 /* IPXE path */
 #undef IPXE_PATH
 

tools/configure

@@ -636,7 +636,6 @@ LIBNL3_LIBS
 LIBNL3_CFLAGS
 argp_ldflags
 libiconv
-PTYFUNCS_LIBS
 PTHREAD_LIBS
 PTHREAD_LDFLAGS
 PTHREAD_CFLAGS
@@ -3749,8 +3748,6 @@ esac
 
 
 
-
-
 # Fetched from http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_compare_version.m4
 # Commit ID: 27948f49ca30e4222bb7cdd55182bd7341ac50c5
 # ===========================================================================
@@ -8944,71 +8941,6 @@ $as_echo "$ax_cv_pthread_flags" >&6; }
 
 
 
-
-
-    saved_CPPFLAGS="$CPPFLAGS"
-
-    CPPFLAGS="$CPPFLAGS -Werror"
-    ac_fn_c_check_header_mongrel "$LINENO" "libutil.h" "ac_cv_header_libutil_h" "$ac_includes_default"
-if test "x$ac_cv_header_libutil_h" = xyes; then :
-
-
-$as_echo "#define INCLUDE_LIBUTIL_H <libutil.h>" >>confdefs.h
-
-
-fi
-
-
-
-    CPPFLAGS="$saved_CPPFLAGS"
-
-    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for openpty et al" >&5
-$as_echo_n "checking for openpty et al... " >&6; }
-if ${ax_cv_ptyfuncs_libs+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-
-        for ax_cv_ptyfuncs_libs in -lutil "" NOT_FOUND; do
-            if test "x$ax_cv_ptyfuncs_libs" = "xNOT_FOUND"; then
-                { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
-$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
-as_fn_error $? "Unable to find library for openpty and login_tty
-See \`config.log' for more details" "$LINENO" 5; }
-            fi
-
-    saved_LIBS="$LIBS"
-
-            LIBS="$LIBS $ax_cv_ptyfuncs_libs"
-            cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-#ifdef INCLUDE_LIBUTIL_H
-#include INCLUDE_LIBUTIL_H
-#endif
-int main(void) {
-  openpty(0,0,0,0,0);
-  login_tty(0);
-}
-
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-
-                break
-
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-
-    LIBS="$saved_LIBS"
-
-        done
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_ptyfuncs_libs" >&5
-$as_echo "$ax_cv_ptyfuncs_libs" >&6; }
-    PTYFUNCS_LIBS="$ax_cv_ptyfuncs_libs"
-
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for yajl_alloc in -lyajl" >&5
 $as_echo_n "checking for yajl_alloc in -lyajl... " >&6; }
 if ${ac_cv_lib_yajl_yajl_alloc+:} false; then :

tools/configure.ac

@@ -67,7 +67,6 @@ m4_include([../m4/uuid.m4])
 m4_include([../m4/pkg.m4])
 m4_include([../m4/curses.m4])
 m4_include([../m4/pthread.m4])
-m4_include([../m4/ptyfuncs.m4])
 m4_include([../m4/extfs.m4])
 m4_include([../m4/fetcher.m4])
 m4_include([../m4/ax_compare_version.m4])
@@ -405,7 +404,6 @@ AC_SUBST(zlib)
 AC_SUBST(system_aio)
 AX_CHECK_EXTFS
 AX_CHECK_PTHREAD
-AX_CHECK_PTYFUNCS
 AC_CHECK_LIB([yajl], [yajl_alloc], [],
     [AC_MSG_ERROR([Could not find yajl])])
 AC_CHECK_LIB([z], [deflateCopy], [], [AC_MSG_ERROR([Could not find zlib])])

tools/libs/light/Makefile

@@ -167,7 +167,7 @@ NO_HEADERS_CHK := y
 
 include $(XEN_ROOT)/tools/libs/libs.mk
 
-LDUSELIBS-y += $(PTYFUNCS_LIBS)
+LDUSELIBS-y += $(UTIL_LIBS)
 LDUSELIBS-$(CONFIG_LIBNL) += $(LIBNL3_LIBS)
 LDUSELIBS-$(CONFIG_Linux) += -luuid
 LDUSELIBS-$(CONFIG_Linux) += -lrt

tools/libs/light/libxl_bootloader.c

@@ -19,10 +19,6 @@
 #include <utmp.h>
 #endif
 
-#ifdef INCLUDE_LIBUTIL_H
-#include INCLUDE_LIBUTIL_H
-#endif
-
 #include "libxl_internal.h"
 
 #define BOOTLOADER_BUF_OUT 65536