Autoconf configure script updates: (1) remove the long-obsolete

--enable-cross-thread-connections option.  (2) remove the --with-hints= options.
(3) Extension loading is enabled by default.  (4) Check for strchrnull()
(5) Update the --help text.

Makefile.in

@@ -41,7 +41,7 @@ TCC += -D_HAVE_SQLITE_CONFIG_H -DBUILD_sqlite
 # Omitting the define will cause extra debugging code to be inserted and
 # includes extra comments when "EXPLAIN stmt" is used.
 #
-TCC += @TARGET_DEBUG@ @XTHREADCONNECT@
+TCC += @TARGET_DEBUG@
 
 # Compiler options needed for programs that use the TCL library.
 #

config.h.in

@@ -48,6 +48,9 @@
 /* Define to 1 if you have the <stdlib.h> header file. */
 #undef HAVE_STDLIB_H
 
+/* Define to 1 if you have the strchrnul() function */
+#undef HAVE_STRCHRNUL
+
 /* Define to 1 if you have the <strings.h> header file. */
 #undef HAVE_STRINGS_H
 

configure

@@ -868,7 +868,6 @@ RELEASE
 VERSION_NUMBER
 BUILD_CC
 SQLITE_THREADSAFE
-XTHREADCONNECT
 ALLOWRELEASE
 TEMP_STORE
 BUILD_EXEEXT
@@ -906,9 +905,7 @@ enable_fast_install
 with_gnu_ld
 enable_libtool_lock
 enable_largefile
-with_hints
 enable_threadsafe
-enable_cross_thread_connections
 enable_releasemode
 enable_tempstore
 enable_tcl
@@ -1562,9 +1559,7 @@ Optional Features:
                           optimize for fast installation [default=yes]
   --disable-libtool-lock  avoid locking (might break parallel builds)
   --disable-largefile     omit support for large files
-  --enable-threadsafe     Support threadsafe operation
-  --enable-cross-thread-connections
-                          Allow connection sharing across threads
+  --disable-threadsafe    Disable mutexing
   --enable-releasemode    Support libtool link to release mode
   --enable-tempstore      Use an in-ram database for temporary tables
                           (never,no,yes,always)
@@ -1573,7 +1568,8 @@ Optional Features:
   --enable-debug          enable debugging & verbose explain
   --disable-amalgamation  Disable the amalgamation and instead build all files
                           separately
-  --enable-load-extension Enable loading of external extensions
+  --disable-load-extension
+                          Disable loading of external extensions
   --enable-gcov           Enable coverage testing using gcov
 
 Optional Packages:
@@ -1582,7 +1578,6 @@ Optional Packages:
   --with-pic              try to use only PIC/non-PIC objects [default=use
                           both]
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
-  --with-hints=FILE       Read configuration options from FILE
   --with-tcl=DIR          directory containing tcl configuration
                           (tclConfig.sh)
   --with-readline-lib     specify readline library
@@ -2058,9 +2053,6 @@ please regen with autoconf" >&2;}
    { (exit 1); exit 1; }; }
 fi
 
-# The following RCS revision string applies to configure.in
-# $Revision: 1.56 $
-
 #########
 # Programs needed
 #
@@ -3732,13 +3724,13 @@ if test "${lt_cv_nm_interface+set}" = set; then
 else
   lt_cv_nm_interface="BSD nm"
   echo "int some_variable = 0;" > conftest.$ac_ext
-  (eval echo "\"\$as_me:3735: $ac_compile\"" >&5)
+  (eval echo "\"\$as_me:3727: $ac_compile\"" >&5)
   (eval "$ac_compile" 2>conftest.err)
   cat conftest.err >&5
-  (eval echo "\"\$as_me:3738: $NM \\\"conftest.$ac_objext\\\"\"" >&5)
+  (eval echo "\"\$as_me:3730: $NM \\\"conftest.$ac_objext\\\"\"" >&5)
   (eval "$NM \"conftest.$ac_objext\"" 2>conftest.err > conftest.out)
   cat conftest.err >&5
-  (eval echo "\"\$as_me:3741: output\"" >&5)
+  (eval echo "\"\$as_me:3733: output\"" >&5)
   cat conftest.out >&5
   if $GREP 'External.*some_variable' conftest.out > /dev/null; then
     lt_cv_nm_interface="MS dumpbin"
@@ -4960,7 +4952,7 @@ ia64-*-hpux*)
   ;;
 *-*-irix6*)
   # Find out which ABI we are using.
-  echo '#line 4963 "configure"' > conftest.$ac_ext
+  echo '#line 4955 "configure"' > conftest.$ac_ext
   if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   (eval $ac_compile) 2>&5
   ac_status=$?
@@ -6829,11 +6821,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:6832: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:6824: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:6836: \$? = $ac_status" >&5
+   echo "$as_me:6828: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings other than the usual output.
@@ -7168,11 +7160,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:7171: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:7163: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:7175: \$? = $ac_status" >&5
+   echo "$as_me:7167: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings other than the usual output.
@@ -7273,11 +7265,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:7276: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:7268: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:7280: \$? = $ac_status" >&5
+   echo "$as_me:7272: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -7328,11 +7320,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:7331: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:7323: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:7335: \$? = $ac_status" >&5
+   echo "$as_me:7327: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -10141,7 +10133,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10144 "configure"
+#line 10136 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -10237,7 +10229,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10240 "configure"
+#line 10232 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12146,7 +12138,8 @@ done
 
 
 
-for ac_func in usleep fdatasync localtime_r gmtime_r localtime_s utime malloc_usable_size
+
+for ac_func in usleep fdatasync localtime_r gmtime_r localtime_s utime malloc_usable_size strchrnul
 do
 as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 { $as_echo "$as_me:$LINENO: checking for $ac_func" >&5
@@ -12342,45 +12335,6 @@ VERSION_NUMBER=`cat $srcdir/VERSION \
 $as_echo "$as_me: Version number set to $VERSION_NUMBER" >&6;}
 
 
-#########
-# Check to see if the --with-hints=FILE option is used.  If there is none,
-# then check for a files named "$host.hints" and ../$hosts.hints where
-# $host is the hostname of the build system.  If still no hints are
-# found, try looking in $system.hints and ../$system.hints where
-# $system is the result of uname -s.
-#
-
-# Check whether --with-hints was given.
-if test "${with_hints+set}" = set; then
-  withval=$with_hints; hints=$withval
-fi
-
-if test "$hints" = ""; then
-  host=`hostname | sed 's/\..*//'`
-  if test -r $host.hints; then
-    hints=$host.hints
-  else
-     if test -r ../$host.hints; then
-       hints=../$host.hints
-     fi
-  fi
-fi
-if test "$hints" = ""; then
-  sys=`uname -s`
-  if test -r $sys.hints; then
-    hints=$sys.hints
-  else
-     if test -r ../$sys.hints; then
-       hints=../$sys.hints
-     fi
-  fi
-fi
-if test "$hints" != ""; then
-  { $as_echo "$as_me:$LINENO: result: reading hints from $hints" >&5
-$as_echo "reading hints from $hints" >&6; }
-  . $hints
-fi
-
 #########
 # Locate a compiler for the build machine.  This compiler should
 # generate command-line programs that run on the build machine.
@@ -12552,31 +12506,6 @@ fi
 
 fi
 
-##########
-# Do we want to allow a connection created in one thread to be used
-# in another thread.  This does not work on many Linux systems (ex: RedHat 9)
-# due to bugs in the threading implementations.  This is thus off by default.
-#
-# Check whether --enable-cross-thread-connections was given.
-if test "${enable_cross_thread_connections+set}" = set; then
-  enableval=$enable_cross_thread_connections;
-else
-  enable_xthreadconnect=no
-fi
-
-{ $as_echo "$as_me:$LINENO: checking whether to allow connections to be shared across threads" >&5
-$as_echo_n "checking whether to allow connections to be shared across threads... " >&6; }
-if test "$enable_xthreadconnect" = "no"; then
-  XTHREADCONNECT=''
-  { $as_echo "$as_me:$LINENO: result: no" >&5
-$as_echo "no" >&6; }
-else
-  XTHREADCONNECT='-DSQLITE_ALLOW_XTHREAD_CONNECT=1'
-  { $as_echo "$as_me:$LINENO: result: yes" >&5
-$as_echo "yes" >&6; }
-fi
-
-
 ##########
 # Do we want to support release
 #
@@ -13427,7 +13356,7 @@ fi
 if test "${enable_load_extension+set}" = set; then
   enableval=$enable_load_extension; use_loadextension=$enableval
 else
-  use_loadextension=no
+  use_loadextension=yes
 fi
 
 if test "${use_loadextension}" = "yes" ; then