diff --git a/lib/std/io/file.c3 b/lib/std/io/file.c3
index 95da59d23..0e27ca96a 100644
--- a/lib/std/io/file.c3
+++ b/lib/std/io/file.c3
@@ -175,6 +175,8 @@ fn char[]! load_buffer(String filename, char[] buffer)
 
 }
 
+fn char[]! load(Allocator allocator, String filename) => load_new(filename, allocator);
+
 fn char[]! load_new(String filename, Allocator allocator = allocator::heap())
 {
 	File file = open(filename, "rb")!;
diff --git a/releasenotes.md b/releasenotes.md
index 6a1ee0529..6a16195a7 100644
--- a/releasenotes.md
+++ b/releasenotes.md
@@ -7,6 +7,8 @@
 - Add `--enable-new-generics` to enable `Foo{int}` generic syntax.
 - `{| |}` expression blocks deprecated.
 - c3c `--test-leak-report` flag for displaying full memory lead report if any
+- Output into /.build/obj/<platform> by default.
+- Output llvm/asm into llvm/<platform> and asm/<platform> by default.
 
 ### Fixes
 - Bug appearing when `??` was combined with boolean in some cases.
@@ -18,6 +20,8 @@
 - Crash when trying to define a method macro that isn't `@construct` but has no arguments.
 - Regression, `.gitkeep` files were generated incorrectly.
 - Aliases are now correctly handled as if they were variables/functions in regards to namespacing and accept `@builtin`.
+- Correctly handle in/out when interacting with inout.
+- Don't delete .o files not produced by the compiler.
 
 ### Stdlib changes
 
diff --git a/src/build/builder.c b/src/build/builder.c
index 0f0d7d32a..91e2e1dd0 100644
--- a/src/build/builder.c
+++ b/src/build/builder.c
@@ -461,23 +461,54 @@ static void update_build_target_from_options(BuildTarget *target, BuildOptions *
 		default: UNREACHABLE;
 	}
 
+	if (target->arch_os_target == ARCH_OS_TARGET_DEFAULT) target->arch_os_target = default_target;
+
+	if (target->arch_os_target == ARCH_OS_TARGET_DEFAULT)
+	{
+		error_exit("Unable to detect the default target, please set an explicit --target value.");
+	}
+
+	const char *target_name = arch_os_target[target->arch_os_target];
 	if (command_accepts_files(options->command))
 	{
-		target->build_dir = options->build_dir ? options->build_dir : NULL;
-		target->object_file_dir = options->obj_out ? options->obj_out : target->build_dir;
-		target->ir_file_dir = options->llvm_out ? options->llvm_out : target->build_dir;
-		target->asm_file_dir = options->asm_out ? options->asm_out : target->build_dir;
-		target->script_dir = options->script_dir ? options->script_dir : target->script_dir;
+		target->build_dir = options->build_dir ? options->build_dir : ".build";
+		if (!target->script_dir) target->script_dir = target->build_dir;
 	}
 	else
 	{
-		target->build_dir = options->build_dir ? options->build_dir : "build";
-		target->object_file_dir = options->obj_out ? options->obj_out : file_append_path(target->build_dir, "tmp");
-		target->ir_file_dir = options->llvm_out ? options->llvm_out : file_append_path(target->build_dir, "llvm_ir");
-		target->asm_file_dir = options->asm_out ? options->asm_out : file_append_path(target->build_dir, "asm");
-		target->script_dir = options->script_dir ? options->script_dir : target->script_dir;
+		if (!target->build_dir) target->build_dir = "build";
+		if (options->build_dir)
+		{
+			target->build_dir = options->build_dir;
+		}
+		else
+		{
+			options->build_dir = target->build_dir;
+		}
 		if (!target->script_dir) target->script_dir = "scripts";
 	}
+	target->ir_file_dir = options->llvm_out;
+	target->asm_file_dir = options->asm_out;
+	target->object_file_dir = options->obj_out;
+	if (!target->ir_file_dir)
+	{
+		target->ir_file_dir = options->build_dir
+			? file_append_path(file_append_path(options->build_dir, "llvm"), target_name)
+			: file_append_path("llvm", target_name);
+		}
+	if (!target->asm_file_dir)
+	{
+		target->asm_file_dir = options->build_dir
+			? file_append_path(file_append_path(options->build_dir, "asm"), target_name)
+			: file_append_path("asm", target_name);
+	}
+	if (!target->object_file_dir)
+	{
+		target->object_file_dir = options->build_dir
+			? file_append_path(file_append_path(options->build_dir, "obj"), target_name)
+			: file_append_path("obj", target_name);
+	}
+
 	switch (options->compile_option)
 	{
 		case COMPILE_NORMAL:
diff --git a/src/compiler/compiler.c b/src/compiler/compiler.c
index 30cdcdcff..46d5266aa 100644
--- a/src/compiler/compiler.c
+++ b/src/compiler/compiler.c
@@ -391,13 +391,21 @@ void compiler_parse(void)
 
 static void create_output_dir(const char *dir)
 {
-	if (!file_exists(dir))
+	if (!dir) return;
+	if (file_exists(dir))
 	{
-		if (!dir_make(dir)) error_exit("Failed to create output directory %s.", dir);
+		if (!file_is_dir(dir)) error_exit("Output directory is not a directory %s.", dir);
+		return;
+	}
+	scratch_buffer_clear();
+	scratch_buffer_append(dir);
+	if (!dir_make_recursive(scratch_buffer_to_string()))
+	{
+		error_exit("Failed to create directory '%s'.", dir);
 	}
-	if (!file_is_dir(dir)) error_exit("Output directory is not a directory %s.", dir);
 }
 
+
 void compiler_compile(void)
 {
 	if (compiler.build.lsp_output)
@@ -439,31 +447,19 @@ void compiler_compile(void)
 
 	if (compiler.build.asm_file_dir || compiler.build.ir_file_dir || compiler.build.emit_object_files)
 	{
-		if (compiler.build.build_dir && !file_exists(compiler.build.build_dir) && !dir_make(compiler.build.build_dir))
-		{
-			error_exit("Failed to create build directory '%s'.", compiler.build.build_dir);
-		}
+		create_output_dir(compiler.build.build_dir);
 	}
 	if (compiler.build.ir_file_dir && (compiler.build.emit_llvm || compiler.build.test_output || compiler.build.lsp_output))
 	{
-		if (!file_exists(compiler.build.ir_file_dir) && !dir_make(compiler.build.ir_file_dir))
-		{
-			error_exit("Failed to create output directory '%s'.", compiler.build.ir_file_dir);
-		}
+		create_output_dir(compiler.build.ir_file_dir);
 	}
 	if (compiler.build.asm_file_dir && compiler.build.emit_asm)
 	{
-		if (!file_exists(compiler.build.asm_file_dir) && !dir_make(compiler.build.asm_file_dir))
-		{
-			error_exit("Failed to create output directory '%s'.", compiler.build.asm_file_dir);
-		}
+		create_output_dir(compiler.build.asm_file_dir);
 	}
 	if (compiler.build.object_file_dir && compiler.build.emit_object_files)
 	{
-		if (!file_exists(compiler.build.object_file_dir) && !dir_make(compiler.build.object_file_dir))
-		{
-			error_exit("Failed to create output directory '%s'.", compiler.build.object_file_dir);
-		}
+		create_output_dir(compiler.build.object_file_dir);
 	}
 	if (compiler.build.type == TARGET_TYPE_EXECUTABLE && !compiler.context.main && !compiler.build.no_entry)
 	{
@@ -533,14 +529,14 @@ void compiler_compile(void)
 	free_arenas();
 
 	uint32_t output_file_count = vec_size(gen_contexts);
-	unsigned objfiles = vec_size(compiler.build.object_files);
+	unsigned external_objfile_count = vec_size(compiler.build.object_files);
 	unsigned cfiles = vec_size(compiler.build.csources);
 	unsigned cfiles_library = 0;
 	FOREACH(LibraryTarget *, lib, compiler.build.ccompiling_libraries)
 	{
 		cfiles_library += vec_size(lib->csources);
 	}
-	unsigned total_output = output_file_count + cfiles + cfiles_library + objfiles;
+	unsigned total_output = output_file_count + cfiles + cfiles_library + external_objfile_count;
 	if (total_output > MAX_OUTPUT_FILES)
 	{
 		error_exit("Too many output files.");
@@ -575,7 +571,7 @@ void compiler_compile(void)
 		obj_file_next += compile_cfiles(lib->cc ? lib->cc : compiler.build.cc, lib->csources,
 		                                lib->cflags, lib->cinclude_dirs, obj_file_next, lib->parent->provides);
 	}
-	for (unsigned i = 0; i < objfiles; i++)
+	for (unsigned i = 0; i < external_objfile_count; i++)
 	{
 		obj_file_next[0] = compiler.build.object_files[i];
 		obj_file_next++;
@@ -624,7 +620,8 @@ void compiler_compile(void)
 		puts("# output-files-end");
 	}
 
-	output_file_count += cfiles + cfiles_library + objfiles;
+	output_file_count += cfiles + cfiles_library + external_objfile_count;
+	unsigned objfile_delete_count = output_file_count - external_objfile_count;
 	free(compile_data);
 	compiler_codegen_time = bench_mark();
 
@@ -671,7 +668,7 @@ void compiler_compile(void)
 			platform_linker(output_exe, obj_files, output_file_count);
 			compiler_link_time = bench_mark();
 			compiler_print_bench();
-			delete_object_files(obj_files, output_file_count);
+			delete_object_files(obj_files, objfile_delete_count);
 		}
 		else
 		{
@@ -684,7 +681,7 @@ void compiler_compile(void)
 			}
 			else
 			{
-				delete_object_files(obj_files, output_file_count);
+				delete_object_files(obj_files, objfile_delete_count);
 			}
 		}
 
@@ -750,7 +747,7 @@ void compiler_compile(void)
 		{
 			error_exit("Failed to produce static library '%s'.", output_static);
 		}
-		delete_object_files(obj_files, output_file_count);
+		delete_object_files(obj_files, objfile_delete_count);
 		compiler_link_time = bench_mark();
 		compiler_print_bench();
 		OUTF("Static library '%s' created.\n", output_static);
@@ -770,7 +767,7 @@ void compiler_compile(void)
 		{
 			error_exit("Failed to produce dynamic library '%s'.", output_dynamic);
 		}
-		delete_object_files(obj_files, output_file_count);
+		delete_object_files(obj_files, objfile_delete_count);
 		OUTF("Dynamic library '%s' created.\n", output_dynamic);
 		compiler_link_time = bench_mark();
 		compiler_print_bench();
diff --git a/src/compiler/sema_asm.c b/src/compiler/sema_asm.c
index 0c63283cd..0b0fd24c4 100644
--- a/src/compiler/sema_asm.c
+++ b/src/compiler/sema_asm.c
@@ -459,7 +459,7 @@ static inline bool sema_check_asm_memvar(SemaContext *context, AsmInlineBlock *b
 	if (is_read)
 	{
 		decl->var.is_read = true;
-		if (decl->var.out_param)
+		if (decl->var.out_param && !decl->var.in_param)
 		{
 			RETURN_SEMA_ERROR(expr, "An 'out' variable may not be read from.");
 		}
@@ -468,7 +468,7 @@ static inline bool sema_check_asm_memvar(SemaContext *context, AsmInlineBlock *b
 	if (is_write)
 	{
 		decl->var.is_written = true;
-		if (decl->var.in_param)
+		if (decl->var.in_param && !decl->var.out_param)
 		{
 			RETURN_SEMA_ERROR(expr, "An 'in' variable may not be written to.");
 		}
diff --git a/src/compiler/sema_decls.c b/src/compiler/sema_decls.c
index a897fc288..dfe2c3478 100755
--- a/src/compiler/sema_decls.c
+++ b/src/compiler/sema_decls.c
@@ -3205,6 +3205,8 @@ static inline bool sema_analyse_doc_header(SemaContext *context, AstId doc,
 				param->var.out_param = true;
 				break;
 			case INOUT_INOUT:
+				param->var.out_param = true;
+				param->var.in_param = true;
 				break;
 		}
 		if (!may_be_pointer && type->type_kind != TYPE_SLICE)
diff --git a/src/compiler/sema_expr.c b/src/compiler/sema_expr.c
index 9cd70e0a0..b5eed607d 100644
--- a/src/compiler/sema_expr.c
+++ b/src/compiler/sema_expr.c
@@ -792,7 +792,7 @@ CHECK_INNER:
 	if (inner->expr_kind != EXPR_IDENTIFIER) return true;
 	Decl *decl = inner->ident_expr;
 	if (decl->decl_kind != DECL_VAR) return true;
-	if (!decl->var.in_param) return true;
+	if (!decl->var.in_param || decl->var.out_param) return true;
 	RETURN_SEMA_ERROR(inner, "'in' parameters may not be assigned to.");
 }
 
@@ -1902,21 +1902,21 @@ static inline bool sema_call_check_contract_param_match(SemaContext *context, De
 	{
 		if (expr->unary_expr.expr->ident_expr->var.kind == VARDECL_CONST && param->var.out_param)
 		{
-			SEMA_ERROR(expr, "A const parameter may not be passed into a function or macro as an 'out' argument.");
+			SEMA_ERROR(expr, "A const parameter may not be passed into a function or macro as an 'out' or 'inout' argument.");
 			return false;
 		}
 	}
 	if (expr->expr_kind != EXPR_IDENTIFIER) return true;
 	Decl *ident = expr->ident_expr;
 	if (ident->decl_kind != DECL_VAR) return true;
-	if (ident->var.out_param && param->var.in_param)
+	if (ident->var.out_param && !ident->var.in_param && param->var.in_param)
 	{
-		SEMA_ERROR(expr, "An 'out' parameter may not be passed into a function or macro as an 'in' argument.");
+		SEMA_ERROR(expr, "An 'out' parameter may not be passed into a function or macro as an 'in' or 'inout' argument.");
 		return false;
 	}
-	if (ident->var.in_param && param->var.out_param)
+	if (ident->var.in_param && !ident->var.out_param && param->var.out_param)
 	{
-		SEMA_ERROR(expr, "An 'in' parameter may not be passed into a function or macro as an 'out' argument.");
+		SEMA_ERROR(expr, "An 'in' parameter may not be passed into a function or macro as an 'out' or 'inout' argument.");
 		return false;
 	}
 	return true;
@@ -10170,7 +10170,7 @@ static inline bool sema_cast_rvalue(SemaContext *context, Expr *expr, bool mutat
 			if (inner->expr_kind != EXPR_IDENTIFIER) break;
 			Decl *decl = inner->ident_expr;
 			if (decl->decl_kind != DECL_VAR) break;
-			if (!decl->var.out_param) break;
+			if (!decl->var.out_param || decl->var.in_param) break;
 			RETURN_SEMA_ERROR(expr, "'out' parameters may not be read.");
 		}
 		case EXPR_UNARY:
@@ -10180,7 +10180,7 @@ static inline bool sema_cast_rvalue(SemaContext *context, Expr *expr, bool mutat
 			if (inner->expr_kind != EXPR_IDENTIFIER) break;
 			Decl *decl = inner->ident_expr;
 			if (decl->decl_kind != DECL_VAR) break;
-			if (!decl->var.out_param) break;
+			if (!decl->var.out_param || decl->var.in_param) break;
 			RETURN_SEMA_ERROR(expr, "'out' parameters may not be read.");
 		}
 		default:
diff --git a/src/compiler/target.c b/src/compiler/target.c
index 0546c0128..7d241b55a 100644
--- a/src/compiler/target.c
+++ b/src/compiler/target.c
@@ -1887,13 +1887,6 @@ void target_setup(BuildTarget *target)
 		error_exit("Failed to find Windows def file: '%s' in path.", target->win.def);
 	}
 
-	if (target->arch_os_target == ARCH_OS_TARGET_DEFAULT) target->arch_os_target = default_target;
-
-	if (target->arch_os_target == ARCH_OS_TARGET_DEFAULT)
-	{
-		error_exit("Unable to detect the default target, please set an explicit --target value.");
-	}
-
 	if (target->arch_os_target == ELF_XTENSA && !XTENSA_AVAILABLE)
 	{
 		error_exit("Xtensa support is not available with this LLVM version.");
diff --git a/test/src/test_suite_runner.c3 b/test/src/test_suite_runner.c3
index 80db7501f..00454be8d 100644
--- a/test/src/test_suite_runner.c3
+++ b/test/src/test_suite_runner.c3
@@ -393,6 +393,8 @@ fn void test_file(Path file_path)
 	cmdline.push(compiler_path.str_view());
 	cmdline.push("compile-only");
 	cmdline.push("--test");
+	cmdline.push("--llvm-out");
+	cmdline.push(".");
 	foreach (file : settings.input_files)
 	{
 		cmdline.push(file.name);
diff --git a/test/test_suite/contracts/in_out.c3 b/test/test_suite/contracts/in_out.c3
index 52c12af4c..03f81503d 100644
--- a/test/test_suite/contracts/in_out.c3
+++ b/test/test_suite/contracts/in_out.c3
@@ -8,7 +8,7 @@ fn void bar(Foo* f)
 <* @param [in] f *>
 fn void foo(Foo* f)
 {
-  bar(f); // #error: macro as an 'out' argument
+  bar(f); // #error: An 'in' parameter may not be passed i
 }
 
 <* @param [in] f *>
diff --git a/test/test_suite/contracts/inout_in.c3 b/test/test_suite/contracts/inout_in.c3
new file mode 100644
index 000000000..36ba05aa2
--- /dev/null
+++ b/test/test_suite/contracts/inout_in.c3
@@ -0,0 +1,21 @@
+<*
+ @param [in] foo
+*>
+fn void test(int* foo)
+{
+	test2(foo); // #error: An 'in' parameter may not be passed into
+}
+
+<*
+ @param [out] foo
+*>
+fn void test3(int* foo)
+{
+	test2(foo); // #error: An 'out' parameter may not be passed into
+}
+<*
+ @param [inout] foo
+*>
+fn void test2(int* foo)
+{
+}