diff --git a/auto.def b/auto.def
index 2a3aa4be4d..d4ee5fee6a 100644
--- a/auto.def
+++ b/auto.def
@@ -70,6 +70,7 @@ options {
   with-tempstore:=no => {Use an in-ram database for temporary tables: never,no,yes,always}
   editline=0           => {BSD editline support}
   readline=0           => {readline support}
+  largefile=1          => {Disable large file support}
   with-readline-lib    => {readline library}
   with-readline-inc    => {readline include paths}
   with-linenoise:DIR   => {}
@@ -194,41 +195,27 @@ if {"" eq [hwaci-bin-define install]} {
 }
 
 #########
-# Enable large file support (if special flags are necessary)
-cc-check-lfs
-
-#########
-# Check for needed/wanted data types
-cc-check-types int8_t int16_t int32_t int64_t intptr_t \
-  uint8_t uint16_t uint32_t uint64_t uintptr_t
-
-#########
-# Figure out whether or not we have these functions
-cc-check-functions fdatasync gmtime_r isnan localtime_r localtime_s \
-  malloc_usable_size strchrnul usleep utime pread pread64 pwrite pwrite64
-
-#########
-# Check for needed/wanted headers
-cc-check-includes sys/types.h stdlib.h stdint.h inttypes.h malloc.h
-if {[cc-check-includes zlib.h] && [cc-check-function-in-lib deflate z]} {
-  define HAVE_ZLIB 1
-  define LDFLAGS_ZLIB -lz
-} else {
-  define HAVE_ZLIB 0
-  define LDFLAGS_ZLIB ""
-}
-
-msg-checking "Debug build? "
-hwaci-if-opt-truthy with-debug {
-  msg-result yes
-} {
-  msg-result "no. Use --with-debug to enable."
-}
+# Locate a compiler for the build machine.  This compiler should
+# generate command-line programs that run on the build machine.
+#
+# XXX if test x"$cross_compiling" = xno; then
+# XXX BUILD_CC=$CC
+# XXX BUILD_CFLAGS=$CFLAGS
+# XXX else
+# XXX if test "${BUILD_CC+set}" != set; then
+# XXX AC_CHECK_PROGS BUILD_CC gcc cc cl
+# XXX fi
+# XXX if test "${BUILD_CFLAGS+set}" != set; then
+# XXX BUILD_CFLAGS="-g"
+# XXX fi
+# XXX fi
+# XXX AC_SUBST BUILD_CC
 
 ##########
 # Handle --with-wasi-sdk=DIR
 #
-# This must be early because it changes the toolchain.
+# This must be early because it may change the toolchain and several
+# config options.
 #
 # It's unclear whether we can actually get away with making these
 # changes to the autosetup environment.
@@ -243,7 +230,7 @@ if {1} {
     if {![file exists $wasiSdkDir/bin/clang]} {
       user-error "--with-wasi-sdk=${wasiSdkDir} directory does not contain bin/clang"
     }
-    msg-result "using wasi-sdk clang, disabling: tcl, CLI shell, DLL"
+    msg-result "using wasi-sdk clang, disabling: tcl, CLI shell, DLL, threading"
     define HAVE_WASI_SDK 1
     define WASI_SDK_DIR $wasiSdkDir
     hwaci-opt-set tcl 0
@@ -271,13 +258,40 @@ if {1} {
     # we disable the DLL build...
     #  set enable_shared no
   }
-#  unset wasiSdkDir
+  unset wasiSdkDir
 }; # --wasi-sdk-dir
 
 #########
-# By default, we use the amalgamation (this may be changed below...)
-#
-# XXX USE_AMALGAMATION=1
+# Enable large file support (if special flags are necessary)
+cc-check-lfs
+
+#########
+# Check for needed/wanted data types
+cc-check-types int8_t int16_t int32_t int64_t intptr_t \
+  uint8_t uint16_t uint32_t uint64_t uintptr_t
+
+cc-check-functions gmtime_r isnan localtime_r localtime_s \
+  malloc_usable_size strchrnul usleep utime pread pread64 pwrite pwrite64
+
+cc-check-function-in-lib fdatasync rt
+define LDFLAGS_FDATASYNC [get-define lib_fdatasync]
+undefine lib_fdatasync
+
+#########
+# Check for needed/wanted headers
+cc-check-includes sys/types.h stdlib.h stdint.h inttypes.h malloc.h
+if {[cc-check-includes zlib.h] && [cc-check-function-in-lib deflate z]} {
+  define HAVE_ZLIB 1; # "-DSQLITE_HAVE_ZLIB=1"
+  define LDFLAGS_ZLIB -lz
+} else {
+  define HAVE_ZLIB 0
+  define LDFLAGS_ZLIB ""
+}
+
+hwaci-define-if-opt-truthy with-debug SQLITE_DEBUG "Debug build?"
+hwaci-define-if-opt-truthy amalgamation USE_AMALGAMATION "Use amalgamation for builds?"
+hwaci-define-if-opt-truthy gcov USE_GCOV "Use gcov?"
+hwaci-define-if-opt-truthy test-status TSTRNNR_OPTS "test-runner flags?" {--status} {}
 
 if {0} {
   #########
@@ -400,53 +414,21 @@ if {0} {
   # XXX fi
 }
 
-if {0} {
-  #########
-  # Set up options for running tests.
-  #
-  if {[opt-bool test-status]} {
-    define TSTRNNR_OPTS {--status}
-  } else {
-    define TSTRNNR_OPTS {}
-  }
-  # XXX if test $use_vt100 != no; then
-  # XXX TSTRNNR_OPTS=--status
-  # XXX else
-  # XXX TSTRNNR_OPTS=
-  # XXX fi
-  # XXX AC_SUBST TSTRNNR_OPTS
-}
 
-#########
-# Locate a compiler for the build machine.  This compiler should
-# generate command-line programs that run on the build machine.
-#
-# XXX if test x"$cross_compiling" = xno; then
-# XXX BUILD_CC=$CC
-# XXX BUILD_CFLAGS=$CFLAGS
-# XXX else
-# XXX if test "${BUILD_CC+set}" != set; then
-# XXX AC_CHECK_PROGS BUILD_CC gcc cc cl
-# XXX fi
-# XXX if test "${BUILD_CFLAGS+set}" != set; then
-# XXX BUILD_CFLAGS="-g"
-# XXX fi
-# XXX fi
-# XXX AC_SUBST BUILD_CC
-
-
-##########
-# Do we want to support multithreaded use of sqlite
-#
 msg-checking "Support threadsafe operation? "
 hwaci-if-opt-truthy threadsafe {
   msg-result yes
   add-feature-flag -DSQLITE_THREADSAFE=1
-  cc-check-function-in-lib pthread_create pthread
-  cc-check-function-in-lib pthread_mutexattr_init pthread
+  if {![cc-check-function-in-lib pthread_create pthread]
+      || ![cc-check-function-in-lib pthread_mutexattr_init pthread]} {
+    user-error "Missing required pthread bits"
+  }
+  define LDFLAGS_PTHREAD [get-define lib_pthread_create]
+  undefine lib_pthread_create
 } {
   msg-result no
   add-feature-flag -DSQLITE_THREADSAFE=0
+  define LDFLAGS_PTHREAD ""
 }
 
 ##########
@@ -619,57 +601,10 @@ if {0} {
   # XXX AC_SUBST TARGET_HAVE_LINENOISE
 }
 
-if {0} {
-  ##########
-  # Figure out what C libraries are required to compile programs
-  # that use "fdatasync()" function.
-  #
-  cc-check-function-in-lib fdatasync rt
-}
-
-if {0} {
-  #########
-  # check for debug enabled
-  if {[opt-bool debug]} {
-  }
-  msg-checking "Checking build type..."
-  # XXX if test "${enable_debug}" = "yes" ; then
-  # XXX TARGET_DEBUG="-DSQLITE_DEBUG=1 -DSQLITE_ENABLE_SELECTTRACE -DSQLITE_ENABLE_WHERETRACE -O0 -Wall"
-  msg-result "debug"
-  # XXX else
-  # XXX TARGET_DEBUG="-DNDEBUG"
-  msg-result "release"
-  # XXX fi
-  # XXX AC_SUBST TARGET_DEBUG
-}
-
-if {0} {
-  #########
-  # See whether we should use the amalgamation to build
-
-  if {![opt-bool amalgamation]} {
-  }
-  # XXX if test "${enable_amalgamation}" = "no" ; then
-  # XXX USE_AMALGAMATION=0
-  # XXX fi
-  # XXX AC_SUBST USE_AMALGAMATION
-}
-
-if {0} {
-  #########
-  # Look for zlib.  Only needed by extensions and by the sqlite3.exe shell
-  cc-check-includes zlib.h
-  if {[cc-check-function-in-lib deflate z]} {
-    define HAVE_ZLIB 1; # "-DSQLITE_HAVE_ZLIB=1"
-  } else {
-    define HAVE_ZLIB 0; # HAVE_ZLIB=""
-  }
-  # XXX AC_SUBST HAVE_ZLIB
-}
-
 hwaci-if-opt-truthy load-extension {
   if {[cc-check-function-in-lib dlopen dl]} {
     define LDFLAGS_DLOPEN [get-define lib_dlopen]
+    undefine lib_dlopen
   } else {
     user-error "dlopen() not found. Use --disable-load-extension to bypass this check."
   }
@@ -699,30 +634,6 @@ hwaci-if-opt-truthy json {
   msg-result "Disabling JSON SQL functions"
 }
 
-if {0} {
-  ##########
-  # Do we want to support memsys3 and/or memsys5
-  #
-  if {[opt-bool memsys5]} {
-  }
-  msg-checking "Checking whether to support MEMSYS5..."
-  # XXX if test "${enable_memsys5}" = "yes"; then
-  # XXX OPT_FEATURE_FLAGS="${OPT_FEATURE_FLAGS} -DSQLITE_ENABLE_MEMSYS5"
-  msg-result "yes"
-  # XXX else
-  msg-result "no"
-  # XXX fi
-  if {[opt-bool memsys3]} {
-  }
-  msg-checking "Checking whether to support MEMSYS3..."
-  # XXX if test "${enable_memsys3}" = "yes" -a "${enable_memsys5}" = "no"; then
-  # XXX OPT_FEATURE_FLAGS="${OPT_FEATURE_FLAGS} -DSQLITE_ENABLE_MEMSYS3"
-  msg-result "yes"
-  # XXX else
-  msg-result "no"
-  # XXX fi
-}
-
 if {0} {
   # is this still relevant?
 
@@ -774,15 +685,6 @@ if {0} {
   # XXX BUILD_CFLAGS=$ac_temp_BUILD_CFLAGS
 }
 
-msg-checking "Enable gcov? "
-hwaci-if-opt-truthy gcov {
-  define USE_GCOV 1
-  msg-result yes
-} {
-  define USE_GCOV 0
-  msg-result no
-}
-
 proc affirm-have-math {} {
   if {![cc-check-function-in-lib log m]} {
     user-error "Missing required math APIs"
@@ -873,7 +775,7 @@ hwaci-if-opt-truthy dump-defines {
   global DUMP_DEFINES_FILE
   msg-result "--dump-defines is creating file: $DUMP_DEFINES_FILE"
   make-config-header $DUMP_DEFINES_FILE \
-    -bare {OPT_FEATURE_FLAGS SQLITE_OS_* LDFLAGS_* USE_*} \
+    -bare {OPT_FEATURE_FLAGS SQLITE_OS* SQLITE_DEBUG LDFLAGS_* USE_*} \
     -auto {*}
   # achtung: ^^^^ whichever SQLITE_OS_foo flag which is set to 0 will
   # get _undefined_ here unless it's part of the -bare set.
diff --git a/autosetup/hwaci-common.tcl b/autosetup/hwaci-common.tcl
index 930580960b..20bdb4b470 100644
--- a/autosetup/hwaci-common.tcl
+++ b/autosetup/hwaci-common.tcl
@@ -144,6 +144,29 @@ proc hwaci-if-opt-truthy {flag then {else {}}} {
   if {[hwaci-opt-truthy $flag]} {eval $then} else {eval $else}
 }
 
+########################################################################
+# If [hwaci-opt-truthy $flag] then [define $def $iftrue] else
+# [define $def $iffalse]. Output [msg-checking $msg] and a
+# [msg-results ...] which corresponds to the result. Returns 1
+# if the opt-truthy check passes, else 0.
+proc hwaci-define-if-opt-truthy {flag def msg {iftrue 1} {iffalse 0}} {
+  msg-checking "$msg "
+  set rc 0
+  if {[hwaci-opt-truthy $flag]} {
+    define $def $iftrue
+    set rc 1
+  } else {
+    define $def $iffalse
+  }
+  set msg [get-define $def]
+  switch -- $msg {
+    0 { set msg no }
+    1 { set msg yes }
+  }
+  msg-result $msg
+  return $rc
+}
+
 ########################################################################
 # Args: [-v] optName defName {descr {}}
 #
diff --git a/manifest b/manifest
index 8bdf8719e2..c124584a49 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Improve\scommon\sfeature\sflag\shandling\sa\sbit.
-D 2024-09-25T14:58:09.490
+C Further\sstreamlining\sof\sauto.def.
+D 2024-09-25T18:03:26.242
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -14,7 +14,7 @@ F art/icon-80x90.gif 65509ce3e5f86a9cd64fe7fca2d23954199f31fe44c1e09e208c80fb83d
 F art/sqlite370.eps aa97a671332b432a54e1d74ff5e8775be34200c2
 F art/sqlite370.ico af56c1d00fee7cd4753e8631ed60703ed0fc6e90
 F art/sqlite370.jpg d512473dae7e378a67e28ff96a34da7cb331def2
-F auto.def e90da95aff732435d819c840799ae95743ef1bad622e8178c79fa509a9d34b28
+F auto.def 334d1bcda82fe05ac65baa1485701e05911ce4304175f716bacc33b5ddb1d61c
 F autoconf/INSTALL 83e4a25da9fd053c7b3665eaaaf7919707915903
 F autoconf/Makefile.am adedc1324b6a87fdd1265ddd336d2fb7d4f36a0e77b86ea553ae7cc4ea239347
 F autoconf/Makefile.fallback 22fe523eb36dfce31e0f6349f782eb084e86a5620b2b0b4f84a2d6133f53f5ac
@@ -46,7 +46,7 @@ F autosetup/cc-lib.tcl 493c5935b5dd3bf9bd4eca89b07c8b1b1a9356d61783035144e21795f
 F autosetup/cc-shared.tcl 4f024e94a47f427ba61de1739f6381ef0080210f9fae89112d5c1de1e5460d78
 F autosetup/cc.tcl 1b52de228642c1db5a714d54ca974d723ec8b4092e8c3765d348b625850f7311
 F autosetup/default.auto 5cdf016de2140e50f1db190a02039dc42fb390af1dda4cc4853e3042a9ef0e82
-F autosetup/hwaci-common.tcl c676836141db22751ab9c4e8ff9e66e744546691643f2c2cce459f3af6647f28
+F autosetup/hwaci-common.tcl 6c48b16beb9eb8015f207980095f5f65c55e5238159a9d50791b643e5c295205
 F autosetup/jimsh0.c 1b5fe91fffcddbc29f2b16acb80f1650632ea2edbe8336b8155ef7b4c66f6d8d
 F autosetup/pkg-config.tcl 4e635bf39022ff65e0d5434339dd41503ea48fc53822c9c5bde88b02d3d952ba
 F autosetup/system.tcl 3a39d6e0b3bfba526fd39afe07c1d0d325e5a31925013a1ba7c671e1128e31bb
@@ -2232,8 +2232,8 @@ F vsixtest/vsixtest.tcl 6195aba1f12a5e10efc2b8c0009532167be5e301abe5b31385638080
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 2141527a38ca8170e79b5b5e664378f0d8464055119f5b986e5d7b1be75e919e
-R 6f04bd8bd4e606869da2c4023fe473ea
+P 8716c35eaa168677a10de7b4aa55d35c54035f5e685cc1a5890b940a41cc6ff7
+R 7ae842c7d3995cad59964f0358f0039c
 U stephan
-Z f4464a4d74c89ea0380cf484c98507f9
+Z fd55233750e1823126fedbcf310025fa
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index 9dce95606d..172f049785 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-8716c35eaa168677a10de7b4aa55d35c54035f5e685cc1a5890b940a41cc6ff7
+74d12433599e2f189d8d0a44be834651531ac5a215bf42de386053cd00d29162