user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/tests/rtld/tls_align/libbar.c

@@ -0,0 +1 @@
+_Thread_local __attribute__((aligned(8))) char bar_thread_local[8] = "Hello!";

user/include/mlibc/tests/rtld/tls_align/libfoo.c

@@ -0,0 +1 @@
+_Thread_local __attribute__((aligned(16))) char foo_thread_local[8] = "Hello!";

user/include/mlibc/tests/rtld/tls_align/meson.build

@@ -0,0 +1,7 @@
+libfoo = shared_library('foo', 'libfoo.c')
+libbar = shared_library('bar', 'libbar.c')
+test_link_with = [libfoo, libbar]
+
+libfoo_native = shared_library('native-foo', 'libfoo.c', native: true)
+libbar_native = shared_library('native-bar', 'libbar.c', native: true)
+test_native_link_with = [libfoo_native, libbar_native]

user/include/mlibc/tests/rtld/tls_align/test.c

@@ -0,0 +1,12 @@
+#include <assert.h>
+#include <stdint.h>
+
+extern _Thread_local char foo_thread_local[];
+extern _Thread_local char bar_thread_local[];
+
+int main() {
+	assert(!((uintptr_t)foo_thread_local & (16 - 1)));
+	assert(!((uintptr_t)bar_thread_local & (8 - 1)));
+
+	return 0;
+}