compat: add a few more attribute macros

meson.build

@@ -297,6 +297,18 @@ endif
 
 config.set('TAISEI_BUILDCONF_HAVE_ZIP_COMPRESSION_METHOD_SUPPORTED', have_zip_compression_method_supported)
 
+config.set('TAISEI_BUILDCONF_HAVE_ATTR_DESIGNATED_INIT', cc.compiles(
+    'struct { int dummy; } __attribute__((designated_init)) x;',
+    name : '__attribute__((designated_init))',
+    args : ['-Wattributes', '-Werror']
+))
+
+config.set('TAISEI_BUILDCONF_HAVE_ATTR_MALLOC_WITH_ARGS', cc.compiles(
+    'void myfree(void *p); void *myalloc() __attribute__((malloc(myfree, 1)));',
+    name : '__attribute__((malloc(deallocator, index)))',
+    args : ['-Wattributes', '-Werror']
+))
+
 prefer_relpath_systems = [
     'windows',
 ]

src/util/compat.h

@@ -272,7 +272,7 @@ typedef _Complex double cmplx;
 	attr_returns_nonnull attr_returns_max_aligned attr_nodiscard
 
 // Structure must not be initialized with an implicit (non-designated) initializer.
-#if __has_attribute(designated_init) && defined(TAISEI_BUILDCONF_USE_DESIGNATED_INIT)
+#if __has_attribute(designated_init) && defined(TAISEI_BUILDCONF_HAVE_ATTR_DESIGNATED_INIT)
 	#define attr_designated_init \
 		__attribute__ ((designated_init))
 #else
@@ -284,9 +284,25 @@ typedef _Complex double cmplx;
 #define attr_malloc \
 	__attribute__ ((malloc))
 
-// Function returns a pointer to object whose size is specified by the 'size_arg_index'th function argument.
-#define attr_alloc_size(size_arg_index) \
-	__attribute__ ((alloc_size(size_arg_index)))
+// Function returns a pointer that must be 'freed' with the specified deallocator function
+#ifdef TAISEI_BUILDCONF_HAVE_ATTR_MALLOC_WITH_ARGS
+	#define attr_dealloc(deallocator, arg_index) \
+		__attribute__ ((malloc(deallocator, arg_index)))
+#else
+	#define attr_dealloc(deallocator, arg_index)
+#endif
+
+// With one argument n: function returns a pointer to object whose size is specified by the
+// nth argument.
+// With two arguments n, m: function returns a pointer to object whose size is specified by the
+// product of nth and mth arguments.
+#define attr_alloc_size(...) \
+	__attribute__ ((alloc_size(__VA_ARGS__)))
+
+// Function returns a pointer aligned to a byte boundary specified by nth argument
+#define attr_alloc_align(arg_index) \
+	__attribute__ ((alloc_align(arg_index)))
+
 
 #define INLINE static inline attr_must_inline __attribute__((gnu_inline))
 

src/util/meson.build

@@ -23,12 +23,6 @@ if is_developer_build
     util_src += files('debug.c')
 endif
 
-config.set('TAISEI_BUILDCONF_USE_DESIGNATED_INIT', cc.compiles(
-    'struct { int dummy; } __attribute__((designated_init)) x;',
-    name : '__attribute__((designated_init)) with -Werror',
-    args : ['-Wattributes', '-Werror']
-))
-
 if dep_crypto.found()
     util_src += files('sha256_openssl.c')
 else