Patch #742741: Check for true in different paths, support -pthread.

2 files changed, 343 insertions, 191 deletions

diff --git a/configure b/configure
index d8d5edf..ad33c34 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 1.410 .
+# From configure.in Revision: 1.411 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.53 for python 2.3.
 #
@@ -3949,6 +3949,68 @@ echo "$as_me:$LINENO: result: $ac_cv_kthread" >&5
 echo "${ECHO_T}$ac_cv_kthread" >&6
 fi
 
+if test $ac_cv_kthread = no
+then
+# -pthread, if available, provides the right #defines
+# and linker options to make pthread_create available
+# Some compilers won't report that they do not support -pthread,
+# so we need to run a program to see whether it really made the
+# function available.
+echo "$as_me:$LINENO: checking whether $CC accepts -pthread" >&5
+echo $ECHO_N "checking whether $CC accepts -pthread... $ECHO_C" >&6
+if test "${ac_cv_thread+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_save_cc="$CC"
+CC="$CC -pthread"
+if test "$cross_compiling" = yes; then
+  ac_cv_pthread=no
+else
+  cat >conftest.$ac_ext <<_ACEOF
+#line $LINENO "configure"
+#include "confdefs.h"
+
+#include <pthread.h>
+
+void* routine(void* p){return NULL;}
+
+int main(){
+  pthread_t p;
+  if(pthread_create(&p,NULL,routine,NULL)!=0)
+    return 1;
+  (void)pthread_detach(p);
+  return 0;
+}
+
+_ACEOF
+rm -f conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_pthread=yes
+else
+  echo "$as_me: program exited with status $ac_status" >&5
+echo "$as_me: failed program was:" >&5
+cat conftest.$ac_ext >&5
+( exit $ac_status )
+ac_cv_pthread=no
+fi
+rm -f core core.* *.core conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+fi
+CC="$ac_save_cc"
+fi
+
+echo "$as_me:$LINENO: result: $ac_cv_pthread" >&5
+echo "${ECHO_T}$ac_cv_pthread" >&6
+fi
+
 
 # checks for header files
 echo "$as_me:$LINENO: checking for ANSI C header files" >&5
@@ -9202,6 +9264,8 @@ if test "$ac_cv_kpthread" = "yes"
 then CC="$CC -Kpthread"
 elif test "$ac_cv_kthread" = "yes"
 then CC="$CC -Kthread"
+elif test "$ac_cv_pthread" = "yes"
+then CC="$CC -pthread"
 fi
 echo "$as_me:$LINENO: checking for pthread_t" >&5
 echo $ECHO_N "checking for pthread_t... $ECHO_C" >&6
@@ -10222,6 +10286,15 @@ _ACEOF
 
     posix_threads=yes
     THREADOBJ="Python/thread.o"
+elif test "$ac_cv_pthread" = "yes"
+then
+    CC="$CC -pthread"
+    cat >>confdefs.h <<\_ACEOF
+#define WITH_THREAD 1
+_ACEOF
+
+    posix_threads=yes
+    THREADOBJ="Python/thread.o"
 else
     if test ! -z "$with_threads" -a -d "$with_threads"
     then LDFLAGS="$LDFLAGS -L$with_threads"
@@ -11232,7 +11305,151 @@ fi
 
 
 
-    if test "$posix_threads" = "yes"; then
+    echo "$as_me:$LINENO: checking for usconfig in -lmpc" >&5
+echo $ECHO_N "checking for usconfig in -lmpc... $ECHO_C" >&6
+if test "${ac_cv_lib_mpc_usconfig+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lmpc  $LIBS"
+cat >conftest.$ac_ext <<_ACEOF
+#line $LINENO "configure"
+#include "confdefs.h"
+
+/* Override any gcc2 internal prototype to avoid an error.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+/* We use char because int might match the return type of a gcc2
+   builtin and then its argument prototype would still apply.  */
+char usconfig ();
+#ifdef F77_DUMMY_MAIN
+#  ifdef __cplusplus
+     extern "C"
+#  endif
+   int F77_DUMMY_MAIN() { return 1; }
+#endif
+int
+main ()
+{
+usconfig ();
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+         { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_lib_mpc_usconfig=yes
+else
+  echo "$as_me: failed program was:" >&5
+cat conftest.$ac_ext >&5
+ac_cv_lib_mpc_usconfig=no
+fi
+rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+echo "$as_me:$LINENO: result: $ac_cv_lib_mpc_usconfig" >&5
+echo "${ECHO_T}$ac_cv_lib_mpc_usconfig" >&6
+if test $ac_cv_lib_mpc_usconfig = yes; then
+  cat >>confdefs.h <<\_ACEOF
+#define WITH_THREAD 1
+_ACEOF
+
+    LIBS="$LIBS -lmpc"
+    THREADOBJ="Python/thread.o"
+    USE_THREAD_MODULE=""
+fi
+
+
+    if test "$posix_threads" != "yes"; then
+      echo "$as_me:$LINENO: checking for thr_create in -lthread" >&5
+echo $ECHO_N "checking for thr_create in -lthread... $ECHO_C" >&6
+if test "${ac_cv_lib_thread_thr_create+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lthread  $LIBS"
+cat >conftest.$ac_ext <<_ACEOF
+#line $LINENO "configure"
+#include "confdefs.h"
+
+/* Override any gcc2 internal prototype to avoid an error.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+/* We use char because int might match the return type of a gcc2
+   builtin and then its argument prototype would still apply.  */
+char thr_create ();
+#ifdef F77_DUMMY_MAIN
+#  ifdef __cplusplus
+     extern "C"
+#  endif
+   int F77_DUMMY_MAIN() { return 1; }
+#endif
+int
+main ()
+{
+thr_create ();
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+         { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_lib_thread_thr_create=yes
+else
+  echo "$as_me: failed program was:" >&5
+cat conftest.$ac_ext >&5
+ac_cv_lib_thread_thr_create=no
+fi
+rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+echo "$as_me:$LINENO: result: $ac_cv_lib_thread_thr_create" >&5
+echo "${ECHO_T}$ac_cv_lib_thread_thr_create" >&6
+if test $ac_cv_lib_thread_thr_create = yes; then
+  cat >>confdefs.h <<\_ACEOF
+#define WITH_THREAD 1
+_ACEOF
+
+      LIBS="$LIBS -lthread"
+      THREADOBJ="Python/thread.o"
+      USE_THREAD_MODULE=""
+fi
+
+    fi
+
+    if test "$USE_THREAD_MODULE" != "#"
+    then
+        # If the above checks didn't disable threads, (at least) OSF1
+        # needs this '-threads' argument during linking.
+        case $ac_sys_system in
+        OSF1) LDLAST=-threads;;
+        esac
+    fi
+fi
+
+if test "$posix_threads" = "yes"; then
       if test "$unistd_defines_pthreads" = "no"; then
 
 cat >>confdefs.h <<\_ACEOF
@@ -11243,11 +11460,18 @@ _ACEOF
 
       # Bug 662787: Using semaphores causes unexplicable hangs on Solaris 8.
       case  $ac_sys_system/$ac_sys_release in
+  SunOS/5.6)
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_PTHREAD_DESTRUCTOR 1
+_ACEOF
+
+		       ;;
       SunOS/5.8)
 cat >>confdefs.h <<\_ACEOF
 #define HAVE_BROKEN_POSIX_SEMAPHORES 1
 _ACEOF
-;;
+
+		       ;;
       esac
 
       echo "$as_me:$LINENO: checking if PTHREAD_SCOPE_SYSTEM is supported" >&5
@@ -11383,163 +11607,9 @@ _ACEOF
 fi
 done
 
-    fi
-
-    echo "$as_me:$LINENO: checking for usconfig in -lmpc" >&5
-echo $ECHO_N "checking for usconfig in -lmpc... $ECHO_C" >&6
-if test "${ac_cv_lib_mpc_usconfig+set}" = set; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lmpc  $LIBS"
-cat >conftest.$ac_ext <<_ACEOF
-#line $LINENO "configure"
-#include "confdefs.h"
-
-/* Override any gcc2 internal prototype to avoid an error.  */
-#ifdef __cplusplus
-extern "C"
-#endif
-/* We use char because int might match the return type of a gcc2
-   builtin and then its argument prototype would still apply.  */
-char usconfig ();
-#ifdef F77_DUMMY_MAIN
-#  ifdef __cplusplus
-     extern "C"
-#  endif
-   int F77_DUMMY_MAIN() { return 1; }
-#endif
-int
-main ()
-{
-usconfig ();
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext conftest$ac_exeext
-if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
-  (eval $ac_link) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } &&
-         { ac_try='test -s conftest$ac_exeext'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  ac_cv_lib_mpc_usconfig=yes
-else
-  echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
-ac_cv_lib_mpc_usconfig=no
-fi
-rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-echo "$as_me:$LINENO: result: $ac_cv_lib_mpc_usconfig" >&5
-echo "${ECHO_T}$ac_cv_lib_mpc_usconfig" >&6
-if test $ac_cv_lib_mpc_usconfig = yes; then
-  cat >>confdefs.h <<\_ACEOF
-#define WITH_THREAD 1
-_ACEOF
-
-    LIBS="$LIBS -lmpc"
-    THREADOBJ="Python/thread.o"
-    USE_THREAD_MODULE=""
 fi
 
 
-    if test "$posix_threads" != "yes"; then
-      echo "$as_me:$LINENO: checking for thr_create in -lthread" >&5
-echo $ECHO_N "checking for thr_create in -lthread... $ECHO_C" >&6
-if test "${ac_cv_lib_thread_thr_create+set}" = set; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lthread  $LIBS"
-cat >conftest.$ac_ext <<_ACEOF
-#line $LINENO "configure"
-#include "confdefs.h"
-
-/* Override any gcc2 internal prototype to avoid an error.  */
-#ifdef __cplusplus
-extern "C"
-#endif
-/* We use char because int might match the return type of a gcc2
-   builtin and then its argument prototype would still apply.  */
-char thr_create ();
-#ifdef F77_DUMMY_MAIN
-#  ifdef __cplusplus
-     extern "C"
-#  endif
-   int F77_DUMMY_MAIN() { return 1; }
-#endif
-int
-main ()
-{
-thr_create ();
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext conftest$ac_exeext
-if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
-  (eval $ac_link) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } &&
-         { ac_try='test -s conftest$ac_exeext'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  ac_cv_lib_thread_thr_create=yes
-else
-  echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
-ac_cv_lib_thread_thr_create=no
-fi
-rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-echo "$as_me:$LINENO: result: $ac_cv_lib_thread_thr_create" >&5
-echo "${ECHO_T}$ac_cv_lib_thread_thr_create" >&6
-if test $ac_cv_lib_thread_thr_create = yes; then
-  cat >>confdefs.h <<\_ACEOF
-#define WITH_THREAD 1
-_ACEOF
-
-      LIBS="$LIBS -lthread"
-      THREADOBJ="Python/thread.o"
-      USE_THREAD_MODULE=""
-fi
-
-    fi
-
-    if test "$USE_THREAD_MODULE" != "#"
-    then
-        # If the above checks didn't disable threads, (at least) OSF1
-        # needs this '-threads' argument during linking.
-        case $ac_sys_system in
-        OSF1) LDLAST=-threads;;
-        esac
-    fi
-
-    if test "$posix_threads" = yes -a \
-		"$ac_sys_system" = "SunOS" -a \
-		"$ac_sys_release" = "5.6"; then
-
-cat >>confdefs.h <<\_ACEOF
-#define HAVE_PTHREAD_DESTRUCTOR 1
-_ACEOF
-
-	fi
-
-fi
-
 # Check for enable-ipv6
 
 
@@ -12592,6 +12662,48 @@ echo "${ECHO_T}no" >&6
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
 
+for ac_prog in true
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+echo "$as_me:$LINENO: checking for $ac_word" >&5
+echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6
+if test "${ac_cv_prog_TRUE+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  if test -n "$TRUE"; then
+  ac_cv_prog_TRUE="$TRUE" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+  for ac_exec_ext in '' $ac_executable_extensions; do
+  if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_TRUE="$ac_prog"
+    echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+done
+
+fi
+fi
+TRUE=$ac_cv_prog_TRUE
+if test -n "$TRUE"; then
+  echo "$as_me:$LINENO: result: $TRUE" >&5
+echo "${ECHO_T}$TRUE" >&6
+else
+  echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6
+fi
+
+  test -n "$TRUE" && break
+done
+test -n "$TRUE" || TRUE="/bin/true"
+
+
 echo "$as_me:$LINENO: checking for inet_aton in -lc" >&5
 echo $ECHO_N "checking for inet_aton in -lc... $ECHO_C" >&6
 if test "${ac_cv_lib_c_inet_aton+set}" = set; then
@@ -12648,7 +12760,7 @@ fi
 echo "$as_me:$LINENO: result: $ac_cv_lib_c_inet_aton" >&5
 echo "${ECHO_T}$ac_cv_lib_c_inet_aton" >&6
 if test $ac_cv_lib_c_inet_aton = yes; then
-  /bin/true
+  $ac_cv_prog_TRUE
 else
 
 echo "$as_me:$LINENO: checking for inet_aton in -lresolv" >&5
@@ -18074,6 +18186,7 @@ s,@THREADOBJ@,$THREADOBJ,;t t
 s,@DLINCLDIR@,$DLINCLDIR,;t t
 s,@DYNLOADFILE@,$DYNLOADFILE,;t t
 s,@MACHDEP_OBJS@,$MACHDEP_OBJS,;t t
+s,@TRUE@,$TRUE,;t t
 s,@LIBOBJS@,$LIBOBJS,;t t
 s,@HAVE_GETHOSTBYNAME_R_6_ARG@,$HAVE_GETHOSTBYNAME_R_6_ARG,;t t
 s,@HAVE_GETHOSTBYNAME_R_5_ARG@,$HAVE_GETHOSTBYNAME_R_5_ARG,;t t
diff --git a/configure.in b/configure.in
index 51b35a9..aae3eca 100644
--- a/configure.in
+++ b/configure.in
@@ -792,6 +792,37 @@ CC="$ac_save_cc"])
 AC_MSG_RESULT($ac_cv_kthread)
 fi
 
+if test $ac_cv_kthread = no
+then
+# -pthread, if available, provides the right #defines
+# and linker options to make pthread_create available
+# Some compilers won't report that they do not support -pthread,
+# so we need to run a program to see whether it really made the
+# function available.
+AC_MSG_CHECKING(whether $CC accepts -pthread)
+AC_CACHE_VAL(ac_cv_thread,
+[ac_save_cc="$CC"
+CC="$CC -pthread"
+AC_TRY_RUN([
+#include <pthread.h>
+
+void* routine(void* p){return NULL;}
+
+int main(){
+  pthread_t p;
+  if(pthread_create(&p,NULL,routine,NULL)!=0)
+    return 1;
+  (void)pthread_detach(p);
+  return 0;
+}
+],
+  ac_cv_pthread=yes,
+  ac_cv_pthread=no,
+  ac_cv_pthread=no)
+CC="$ac_save_cc"])
+AC_MSG_RESULT($ac_cv_pthread)
+fi
+
 dnl # check for ANSI or K&R ("traditional") preprocessor
 dnl AC_MSG_CHECKING(for C preprocessor type)
 dnl AC_TRY_COMPILE([
@@ -982,6 +1013,8 @@ if test "$ac_cv_kpthread" = "yes"
 then CC="$CC -Kpthread"
 elif test "$ac_cv_kthread" = "yes"
 then CC="$CC -Kthread"
+elif test "$ac_cv_pthread" = "yes"
+then CC="$CC -pthread"
 fi
 AC_MSG_CHECKING(for pthread_t)
 have_pthread_t=no
@@ -1415,6 +1448,12 @@ then
     AC_DEFINE(WITH_THREAD)
     posix_threads=yes
     THREADOBJ="Python/thread.o"
+elif test "$ac_cv_pthread" = "yes"
+then
+    CC="$CC -pthread"
+    AC_DEFINE(WITH_THREAD)
+    posix_threads=yes
+    THREADOBJ="Python/thread.o"
 else
     if test ! -z "$with_threads" -a -d "$with_threads"
     then LDFLAGS="$LDFLAGS -L$with_threads"
@@ -1510,7 +1549,29 @@ pthread_create (NULL, NULL, start_routine, NULL)], [
     USE_THREAD_MODULE="#"])
     ])])])])])])])])])])])
 
-    if test "$posix_threads" = "yes"; then
+    AC_CHECK_LIB(mpc, usconfig, [AC_DEFINE(WITH_THREAD)
+    LIBS="$LIBS -lmpc"
+    THREADOBJ="Python/thread.o"
+    USE_THREAD_MODULE=""])
+
+    if test "$posix_threads" != "yes"; then     
+      AC_CHECK_LIB(thread, thr_create, [AC_DEFINE(WITH_THREAD)
+      LIBS="$LIBS -lthread"
+      THREADOBJ="Python/thread.o"
+      USE_THREAD_MODULE=""])
+    fi
+
+    if test "$USE_THREAD_MODULE" != "#"
+    then
+        # If the above checks didn't disable threads, (at least) OSF1
+        # needs this '-threads' argument during linking.
+        case $ac_sys_system in
+        OSF1) LDLAST=-threads;;
+        esac
+    fi
+fi
+
+if test "$posix_threads" = "yes"; then
       if test "$unistd_defines_pthreads" = "no"; then
          AC_DEFINE(_POSIX_THREADS, 1,
          [Define if you have POSIX threads, 
@@ -1519,8 +1580,12 @@ pthread_create (NULL, NULL, start_routine, NULL)], [
 
       # Bug 662787: Using semaphores causes unexplicable hangs on Solaris 8.
       case  $ac_sys_system/$ac_sys_release in
+  SunOS/5.6) AC_DEFINE(HAVE_PTHREAD_DESTRUCTOR, 1,
+                       Defined for Solaris 2.6 bug in pthread header.)
+		       ;;
       SunOS/5.8) AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,
-                           Define if the Posix semaphores do not work on your system);;
+		       Define if the Posix semaphores do not work on your system)
+		       ;;
       esac
 
       AC_MSG_CHECKING(if PTHREAD_SCOPE_SYSTEM is supported)
@@ -1546,38 +1611,9 @@ pthread_create (NULL, NULL, start_routine, NULL)], [
         AC_DEFINE(PTHREAD_SYSTEM_SCHED_SUPPORTED, 1, [Defined if PTHREAD_SCOPE_SYSTEM supported.])
       fi
       AC_CHECK_FUNCS(pthread_sigmask)
-    fi
-
-    AC_CHECK_LIB(mpc, usconfig, [AC_DEFINE(WITH_THREAD)
-    LIBS="$LIBS -lmpc"
-    THREADOBJ="Python/thread.o"
-    USE_THREAD_MODULE=""])
-
-    if test "$posix_threads" != "yes"; then     
-      AC_CHECK_LIB(thread, thr_create, [AC_DEFINE(WITH_THREAD)
-      LIBS="$LIBS -lthread"
-      THREADOBJ="Python/thread.o"
-      USE_THREAD_MODULE=""])
-    fi
-
-    if test "$USE_THREAD_MODULE" != "#"
-    then
-        # If the above checks didn't disable threads, (at least) OSF1
-        # needs this '-threads' argument during linking.
-        case $ac_sys_system in
-        OSF1) LDLAST=-threads;;
-        esac
-    fi
-
-    if test "$posix_threads" = yes -a \
-		"$ac_sys_system" = "SunOS" -a \
-		"$ac_sys_release" = "5.6"; then
-		AC_DEFINE(HAVE_PTHREAD_DESTRUCTOR, 1,
-		[Defined for Solaris 2.6 bug in pthread header.])
-	fi
-
 fi
 
+
 # Check for enable-ipv6
 AH_TEMPLATE(ENABLE_IPV6, [Define if --enable-ipv6 is specified])
 AC_MSG_CHECKING([if --enable-ipv6 is specified])
@@ -1977,9 +2013,12 @@ AC_TRY_COMPILE([
   AC_MSG_RESULT(no)
 )
 
+dnl check for true
+AC_CHECK_PROGS(TRUE, true, /bin/true)
+
 dnl On some systems (e.g. Solaris 9), hstrerror and inet_aton are in -lresolv
 dnl On others, they are in the C library, so we to take no action
-AC_CHECK_LIB(c, inet_aton, [/bin/true],
+AC_CHECK_LIB(c, inet_aton, [$ac_cv_prog_TRUE],
   AC_CHECK_LIB(resolv, inet_aton)
 )