user: implement mlibc as the libc, finally.

It's finally done..

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

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

@@ -0,0 +1 @@
+char foo_global[] = "";

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

@@ -0,0 +1,5 @@
+libfoo = shared_library('foo', 'libfoo.c')
+test_depends = [libfoo]
+
+libfoo_native = shared_library('native-foo', 'libfoo.c', native: true)
+test_native_depends = [libfoo_native]

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

@@ -0,0 +1,23 @@
+#include <dlfcn.h>
+#include <assert.h>
+
+#ifdef USE_HOST_LIBC
+#define LIBFOO "libnative-foo.so"
+#else
+#define LIBFOO "libfoo.so"
+#endif
+
+int main() {
+	void *foo_handle = dlopen(LIBFOO, RTLD_LOCAL | RTLD_NOW);
+	assert(foo_handle);
+	
+	char *foo_global = (char *)dlsym(foo_handle, "foo_global");
+	assert(foo_global);
+	
+	Dl_info info;
+	assert(dladdr((const void *)foo_global, &info) != 0);
+	
+	assert(dlclose(foo_handle) == 0);
+
+	return 0;
+}