configure: when dlopen() is not found, only fail fatally if --enable-loadable-module is explicitly provided, else warn instead. Based on discussion around [forum:2efe9c33bd9021ca|forum post 2efe9c33bd9021ca]. Update proj-indented-notice to behave like its docs say it should when the -error flag is used.

FossilOrigin-Name: f28e52cbf9e80cb5a1cde7cba099e2c2b6787a77263796e4f9febf3f30bc99dc

autosetup/proj.tcl

@@ -114,11 +114,13 @@ proc proj-bold {str} {
 #
 # If the -notice flag it used then it emits using [user-notice], which
 # means its rendering will (A) go to stderr and (B) be delayed until
-# the next time autosetup goes to output a message. If -notice
-# is not used, it will send the message to stdout without delay.
+# the next time autosetup goes to output a message.
 #
 # If the -error flag is provided then it renders the message
 # immediately to stderr and then exits.
+#
+# If neither -notice nor -error are used, the message will be sent to
+# stdout without delay.
 proc proj-indented-notice {args} {
   set fErr ""
   set outFunc "puts"
@@ -126,6 +128,7 @@ proc proj-indented-notice {args} {
     switch -exact -- [lindex $args 0] {
       -error  {
         set args [lassign $args fErr]
+        set outFunc "user-notice"
       }
       -notice {
         set args [lassign $args -]

autosetup/sqlite-config.tcl

@@ -855,20 +855,53 @@ proc sqlite-handle-icu {} {
 
 
 ########################################################################
-# Handles the --enable-load-extension flag.
+# Handles the --enable-load-extension flag. Returns 1 if the support
+# is enabled, else 0. If support for that feature is not found, a
+# fatal error is triggered if --enable-load-extension is explicitly
+# provided, else a loud warning is instead emited. If
+# --disable-load-extension is used, no check is performed.
+#
+# Makes the following environment changes:
+#
+# - defines LDFLAGS_DLOPEN to any linker flags needed for this
+#   feature.  It may legally be empty on some systems where dlopen()
+#   is in libc.
+#
+# - If the feature is not available, adds
+#   -DSQLITE_OMIT_LOAD_EXTENSION=1 to the feature flags list.
 proc sqlite-handle-load-extension {} {
+  define LDFLAGS_DLOPEN ""
+  set found 0
   proj-if-opt-truthy load-extension {
-    if {[proj-check-function-in-lib dlopen dl]} {
+    set found [proj-check-function-in-lib dlopen dl]
+    if {$found} {
       define LDFLAGS_DLOPEN [get-define lib_dlopen]
       undefine lib_dlopen
     } else {
-      user-error "dlopen() not found. Use --disable-load-extension to bypass this check."
+      if {[proj-opt-was-provided load-extension]} {
+        # Explicit --enable-load-extension: fail if not found
+        proj-indented-notice -error {
+          --enable-load-extension was provided but dlopen()
+          not found. Use --disable-load-extension to bypass this
+          check.
+        }
+      } else {
+        # It was implicitly enabled: warn if not found
+        proj-indented-notice {
+          WARNING: dlopen() not found, so loadable module support will
+          be disabled. Use --disable-load-extension to bypass this
+          check.
+        }
+      }
     }
-  } {
-    define LDFLAGS_DLOPEN ""
-    sqlite-add-feature-flag {-DSQLITE_OMIT_LOAD_EXTENSION=1}
-    msg-result "Disabling loadable extensions."
   }
+  if {$found} {
+    msg-result "Loadable extension support enabled."
+  } else {
+    msg-result "Disabling loadable extension support. Use --enable-load-extensions to enable them."
+    sqlite-add-feature-flag {-DSQLITE_OMIT_LOAD_EXTENSION=1}
+  }
+  return $found
 }
 
 ########################################################################

manifest

@@ -1,5 +1,5 @@
-C Convert\ssome\sexpensive\sNEVER()\sand\sASSERT()\smacros\sinto\sassert()s.
-D 2025-02-10T11:16:37.391
+C configure:\swhen\sdlopen()\sis\snot\sfound,\sonly\sfail\sfatally\sif\s--enable-loadable-module\sis\sexplicitly\sprovided,\selse\swarn\sinstead.\sBased\son\sdiscussion\saround\s[forum:2efe9c33bd9021ca|forum\spost\s2efe9c33bd9021ca].\sUpdate\sproj-indented-notice\sto\sbehave\slike\sits\sdocs\ssay\sit\sshould\swhen\sthe\s-error\sflag\sis\sused.
+D 2025-02-10T15:01:14.412
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md e108e1e69ae8e8a59e93c455654b8ac9356a11720d3345df2a4743e9590fb20d
@@ -49,8 +49,8 @@ F autosetup/cc-shared.tcl 4f024e94a47f427ba61de1739f6381ef0080210f9fae89112d5c1d
 F autosetup/cc.tcl c0fcc50ca91deff8741e449ddad05bcd08268bc31177e613a6343bbd1fd3e45f
 F autosetup/jimsh0.c 6573f6bc6ff204de0139692648d7037ca0b6c067bac83a7b4e087f20a86866a4
 F autosetup/pkg-config.tcl 4e635bf39022ff65e0d5434339dd41503ea48fc53822c9c5bde88b02d3d952ba
-F autosetup/proj.tcl af5290ee128ce82dd178a474a9dcfaa7e503c88f0709d916cc6079d9b8c801f4
-F autosetup/sqlite-config.tcl 6bff327462d34d2d9fe45738b0be70b80cf709de91b8c3b8a921cbdc2f05f6ff
+F autosetup/proj.tcl 42119a2e899e319b92f3159952b7ef7219c82cb45eeb636aaf8d909def8150f8
+F autosetup/sqlite-config.tcl 341c2751f42c6c8eeeae50bec13d2bb28db73ca2c8b9b97598332aed02e0a71b
 F autosetup/system.tcl 51d4be76cd9a9074704b584e5c9cbba616202c8468cf9ba8a4f8294a7ab1dba9
 F configure 9a00b21dfd13757bbfb8d89b30660a89ec1f8f3a79402b8f9f9b6fc475c3303a x
 F contrib/sqlitecon.tcl 210a913ad63f9f991070821e599d600bd913e0ad
@@ -2209,8 +2209,8 @@ F tool/version-info.c 3b36468a90faf1bbd59c65fd0eb66522d9f941eedd364fabccd7227350
 F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee87c1b31a7
 F tool/warnings.sh 49a486c5069de041aedcbde4de178293e0463ae9918ecad7539eedf0ec77a139
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P 3b1dcac2eeaf5f97450919f2a6eed74a4d54fb2b812bdb4a580f79d075e99dfe
-R 47d7be136c4f4c146dd38f56c85a1064
-U drh
-Z 9dd82a4bb1074323ccd62faaa22b0ea3
+P 4aad891802d9d87f1ff3cbbf4bc70fa242c6782088189a2bd5d6f8863f552d29
+R 0e46282cf2ae1fcf5877508517bc3bb3
+U stephan
+Z 8b12a9b798d6d21e89b61eb16ecc7324
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-4aad891802d9d87f1ff3cbbf4bc70fa242c6782088189a2bd5d6f8863f552d29
+f28e52cbf9e80cb5a1cde7cba099e2c2b6787a77263796e4f9febf3f30bc99dc