From 97f041d6be08f7be317baa5f5b8a61394e511859 Mon Sep 17 00:00:00 2001
From: Simon Choi <13610195+simc@users.noreply.github.com>
Date: Wed, 5 Feb 2025 11:48:33 +0100
Subject: [PATCH] wasm

---
 libsqlite3-sys/Cargo.toml |  4 +++
 libsqlite3-sys/build.rs   | 72 +++++++++++++++++++++++++++++++--------
 2 files changed, 62 insertions(+), 14 deletions(-)

diff --git a/libsqlite3-sys/Cargo.toml b/libsqlite3-sys/Cargo.toml
index e926668..1ec8f50 100644
--- a/libsqlite3-sys/Cargo.toml
+++ b/libsqlite3-sys/Cargo.toml
@@ -43,6 +43,10 @@ winsqlite3 = []
 [dependencies]
 openssl-sys = { version = "0.9", optional = true }
 
+[target.wasm32-unknown-unknown.dependencies]
+compiler-rt-builtins = "0.1"
+wasm32-unknown-unknown-openbsd-libc = "0.2"
+
 [build-dependencies]
 bindgen = { version = "0.66", optional = true, default-features = false, features = ["runtime"] }
 pkg-config = { version = "0.3.19", optional = true }
diff --git a/libsqlite3-sys/build.rs b/libsqlite3-sys/build.rs
index e3aefad..159c2c4 100644
--- a/libsqlite3-sys/build.rs
+++ b/libsqlite3-sys/build.rs
@@ -115,22 +115,15 @@ mod build_bundled {
             .flag("-DSQLITE_CORE")
             .flag("-DSQLITE_DEFAULT_FOREIGN_KEYS=1")
             .flag("-DSQLITE_ENABLE_API_ARMOR")
-            .flag("-DSQLITE_ENABLE_COLUMN_METADATA")
-            .flag("-DSQLITE_ENABLE_DBSTAT_VTAB")
-            .flag("-DSQLITE_ENABLE_FTS3")
-            .flag("-DSQLITE_ENABLE_FTS3_PARENTHESIS")
-            .flag("-DSQLITE_ENABLE_FTS5")
-            .flag("-DSQLITE_ENABLE_JSON1")
-            .flag("-DSQLITE_ENABLE_LOAD_EXTENSION=1")
-            .flag("-DSQLITE_ENABLE_MEMORY_MANAGEMENT")
-            .flag("-DSQLITE_ENABLE_RTREE")
-            .flag("-DSQLITE_ENABLE_STAT2")
-            .flag("-DSQLITE_ENABLE_STAT4")
-            .flag("-DSQLITE_SOUNDEX")
             .flag("-DSQLITE_THREADSAFE=1")
             .flag("-DSQLITE_USE_URI")
-            .flag("-DHAVE_USLEEP=1")
             .flag("-D_POSIX_THREAD_SAFE_FUNCTIONS") // cross compile with MinGW
+            .flag("-DSQLITE_DEFAULT_MEMSTATUS=0")
+            .flag("-DSQLITE_MAX_EXPR_DEPTH=0")
+            .flag("-DSQLITE_OMIT_DECLTYPE")
+            .flag("-DSQLITE_OMIT_DEPRECATED")
+            .flag("-DSQLITE_OMIT_PROGRESS_CALLBACK")
+            .flag("-DSQLITE_LIKE_DOESNT_MATCH_BLOBS")
             .warnings(false);
 
         if cfg!(feature = "bundled-sqlcipher") {
@@ -234,7 +227,7 @@ mod build_bundled {
             if vs_has_nan {
                 cfg.flag("-DHAVE_ISNAN");
             }
-        } else {
+        } else if env::var("TARGET") != Ok("wasm32-unknown-unknown".to_string()) {
             cfg.flag("-DHAVE_ISNAN");
         }
         if !win_target() {
@@ -249,6 +242,57 @@ mod build_bundled {
                 cfg.file("sqlite3/wasm32-wasi-vfs.c");
             }
         }
+        if env::var("TARGET") == Ok("wasm32-unknown-unknown".to_string()) {
+            // Apple clang doesn't support wasm32, so use Homebrew clang by default.
+            if env::var("HOST") == Ok("x86_64-apple-darwin".to_string()) {
+                if env::var("CC").is_err() {
+                    std::env::set_var("CC", "/usr/local/opt/llvm/bin/clang");
+                }
+                if env::var("AR").is_err() {
+                    std::env::set_var("AR", "/usr/local/opt/llvm/bin/llvm-ar");
+                }
+            } else if env::var("HOST") == Ok("aarch64-apple-darwin".to_string()) {
+                if env::var("CC").is_err() {
+                    std::env::set_var("CC", "/opt/homebrew/opt/llvm/bin/clang");
+                }
+                if env::var("AR").is_err() {
+                    std::env::set_var("AR", "/opt/homebrew/opt/llvm/bin/llvm-ar");
+                }
+            }
+
+            cfg.flag("-DSQLITE_OS_OTHER")
+                .flag("-DSQLITE_TEMP_STORE=3")
+                .flag("-DSQLITE_OMIT_LOCALTIME")
+                .flag("-Wno-incompatible-library-redeclaration");
+
+            let supported_features = [
+                "atomics",
+                "bulk-memory",
+                "exception-handling",
+                "multivalue",
+                "mutable-globals",
+                "nontrapping-fptoint",
+                "reference-types",
+                "relaxed-simd",
+                "sign-ext",
+                "simd128",
+            ];
+            for feature in env::var("CARGO_CFG_TARGET_FEATURE")
+                .unwrap_or_default()
+                .split(',')
+            {
+                if supported_features.contains(&feature) {
+                    cfg.flag(&format!("-m{feature}"));
+                }
+            }
+
+            cfg.include(
+                std::env::var_os("DEP_WASM32_UNKNOWN_UNKNOWN_OPENBSD_LIBC_INCLUDE").unwrap(),
+            );
+
+            println!("cargo:rustc-link-lib=compiler-rt-builtins");
+            println!("cargo:rustc-link-lib=wasm32-unknown-unknown-openbsd-libc");
+        }
         if cfg!(feature = "unlock_notify") {
             cfg.flag("-DSQLITE_ENABLE_UNLOCK_NOTIFY");
         }