Add build tag to enable OSTRACE() logging

This commit adds the `sqlite_os_trace` build tag which sets the
`SQLITE_FORCE_OS_TRACE` and `SQLITE_DEBUG_OS_TRACE` compilation
flags. This produces verbose debugging output of every operating
system call made by SQLite.

.github/workflows/go.yaml

@@ -44,7 +44,7 @@ jobs:
         run: go-acc . -- -race -v -tags "libsqlite3"
 
       - name: 'Tags: full'
-        run: go-acc . -- -race -v -tags "sqlite_allow_uri_authority sqlite_app_armor sqlite_foreign_keys sqlite_fts5 sqlite_icu sqlite_introspect sqlite_json sqlite_preupdate_hook sqlite_secure_delete sqlite_see sqlite_stat4 sqlite_trace sqlite_userauth sqlite_vacuum_incr sqlite_vtable sqlite_unlock_notify sqlite_column_metadata"
+        run: go-acc . -- -race -v -tags "sqlite_allow_uri_authority sqlite_app_armor sqlite_foreign_keys sqlite_fts5 sqlite_icu sqlite_introspect sqlite_json sqlite_os_trace sqlite_preupdate_hook sqlite_secure_delete sqlite_see sqlite_stat4 sqlite_trace sqlite_userauth sqlite_vacuum_incr sqlite_vtable sqlite_unlock_notify sqlite_column_metadata"
 
       - name: 'Tags: vacuum'
         run: go-acc . -- -race -v -tags "sqlite_vacuum_full"

README.md

@@ -172,6 +172,7 @@ go build --tags "icu json1 fts5 secure_delete"
 |  International Components for Unicode | sqlite_icu | This option causes the International Components for Unicode or "ICU" extension to SQLite to be added to the build |
 | Introspect PRAGMAS | sqlite_introspect | This option adds some extra PRAGMA statements. <ul><li>PRAGMA function_list</li><li>PRAGMA module_list</li><li>PRAGMA pragma_list</li></ul> |
 | JSON SQL Functions | sqlite_json | When this option is defined in the amalgamation, the JSON SQL functions are added to the build automatically |
+| OS Trace | sqlite_os_trace | This option enables OSTRACE() debug logging. This can be verbose and should not be used in production. |
 | Pre Update Hook | sqlite_preupdate_hook | Registers a callback function that is invoked prior to each INSERT, UPDATE, and DELETE operation on a database table. |
 | Secure Delete | sqlite_secure_delete | This compile-time option changes the default setting of the secure_delete pragma.<br><br>When this option is not used, secure_delete defaults to off. When this option is present, secure_delete defaults to on.<br><br>The secure_delete setting causes deleted content to be overwritten with zeros. There is a small performance penalty since additional I/O must occur.<br><br>On the other hand, secure_delete can prevent fragments of sensitive information from lingering in unused parts of the database file after it has been deleted. See the documentation on the secure_delete pragma for additional information |
 | Secure Delete (FAST) | sqlite_secure_delete_fast | For more information see [PRAGMA secure_delete](https://www.sqlite.org/pragma.html#pragma_secure_delete) |

sqlite3_opt_os_trace.go

@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Yasuhiro Matsumoto <mattn.jp@gmail.com>.
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+//go:build sqlite_os_trace
+// +build sqlite_os_trace
+
+package sqlite3
+
+/*
+#cgo CFLAGS: -DSQLITE_FORCE_OS_TRACE=1
+#cgo CFLAGS: -DSQLITE_DEBUG_OS_TRACE=1
+*/
+import "C"