libsql-ffi: Fix sqlite3mc build output directory

Don't build inside the source tree because `cargo clean` won't clean up
after it...

libsql-ffi/build.rs

@@ -24,7 +24,7 @@ fn main() {
 
     if cfg!(feature = "multiple-ciphers") {
         println!(
-            "cargo:rerun-if-changed={BUNDLED_DIR}/SQLite3MultipleCiphers/build/libsqlite3mc_static.a"
+            "cargo:rerun-if-changed={out_dir}/sqlite3mc/libsqlite3mc_static.a"
         );
     }
 
@@ -255,7 +255,7 @@ pub fn build_bundled(out_dir: &str, out_path: &Path) {
 }
 
 fn copy_multiple_ciphers(out_dir: &str, out_path: &Path) {
-    let dylib = format!("{BUNDLED_DIR}/SQLite3MultipleCiphers/build/libsqlite3mc_static.a");
+    let dylib = format!("{out_dir}/sqlite3mc/libsqlite3mc_static.a");
     if !Path::new(&dylib).exists() {
         build_multiple_ciphers(out_path);
     }
@@ -289,11 +289,12 @@ fn build_multiple_ciphers(out_path: &Path) {
     )
     .unwrap();
 
-    let bundled_dir = fs::canonicalize(BUNDLED_DIR).unwrap();
+    let bundled_dir = fs::canonicalize(BUNDLED_DIR).unwrap().join("SQLite3MultipleCiphers");
 
-    let build_dir = bundled_dir.join("SQLite3MultipleCiphers").join("build");
-    let _ = fs::remove_dir_all(build_dir.clone());
-    fs::create_dir_all(build_dir.clone()).unwrap();
+    let out_dir = env::var("OUT_DIR").unwrap();
+    let sqlite3mc_build_dir = fs::canonicalize(out_dir.clone()).unwrap().join("sqlite3mc");
+    let _ = fs::remove_dir_all(sqlite3mc_build_dir.clone());
+    fs::create_dir_all(sqlite3mc_build_dir.clone()).unwrap();
 
     let mut cmake_opts: Vec<&str> = vec![];
 
@@ -304,7 +305,7 @@ fn build_multiple_ciphers(out_path: &Path) {
     let cross_cxx_var_name = format!("CXX_{}", cargo_build_target.replace("-", "_"));
     let cross_cxx = env::var(&cross_cxx_var_name).ok();
 
-    let toolchain_path = build_dir.join("toolchain.cmake");
+    let toolchain_path = sqlite3mc_build_dir.join("toolchain.cmake");
     let cmake_toolchain_opt = format!("-DCMAKE_TOOLCHAIN_FILE=toolchain.cmake");
 
     let mut toolchain_file = OpenOptions::new()
@@ -345,9 +346,9 @@ fn build_multiple_ciphers(out_path: &Path) {
     }
 
     let mut cmake = Command::new("cmake");
-    cmake.current_dir("bundled/SQLite3MultipleCiphers/build");
+    cmake.current_dir(sqlite3mc_build_dir.clone());
     cmake.args(cmake_opts.clone());
-    cmake.arg("..");
+    cmake.arg(bundled_dir.clone());
     if cfg!(feature = "wasmtime-bindings") {
         cmake.arg("-DLIBSQL_ENABLE_WASM_RUNTIME=1");
     }
@@ -362,17 +363,17 @@ fn build_multiple_ciphers(out_path: &Path) {
     }
 
     let mut make = Command::new("cmake");
-    make.current_dir("bundled/SQLite3MultipleCiphers/build");
+    make.current_dir(sqlite3mc_build_dir.clone());
     make.args(&["--build", "."]);
     make.args(&["--config", "Release"]);
     if !make.status().unwrap().success() {
         panic!("Failed to run make");
     }
     // The `msbuild` tool puts the output in a different place so let's move it.
-    if Path::exists(&build_dir.join("Release/sqlite3mc_static.lib")) {
+    if Path::exists(&sqlite3mc_build_dir.join("Release/sqlite3mc_static.lib")) {
         fs::rename(
-            build_dir.join("Release/sqlite3mc_static.lib"),
-            build_dir.join("libsqlite3mc_static.a"),
+            sqlite3mc_build_dir.join("Release/sqlite3mc_static.lib"),
+            sqlite3mc_build_dir.join("libsqlite3mc_static.a"),
         )
         .unwrap();
     }