user: implement mlibc as the libc, finally.

It's finally done..

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

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

@@ -0,0 +1 @@
+void foo() {}

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

@@ -0,0 +1,22 @@
+# Remove the RPATH and set the LD_LIBRARY_PATH environment variable
+# instead when running tests to make sure the library can be found
+# in a directory specified by the user at runtime
+
+test_rpath = '$ORIGIN/'
+
+test_ld_path = meson.global_build_root() / 'tests' / 'rtld' / test_name
+test_env += ['LD_LIBRARY_PATH=' + test_ld_path]
+test_native_env += ['LD_LIBRARY_PATH=' + test_ld_path]
+
+libfoo = shared_library('foo', 'libfoo.c',
+	dependencies: libc_dep,
+	link_args: test_additional_link_args,
+)
+
+test_depends = [libfoo]
+
+libfoo_native = shared_library('native-foo', 'libfoo.c',
+	link_args: ['-ldl'] + test_additional_link_args,
+	native: true
+)
+test_native_depends = [libfoo_native]

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

@@ -0,0 +1,18 @@
+#include <dlfcn.h>
+#include <stdio.h>
+#include <assert.h>
+#include <string.h>
+
+#ifdef USE_HOST_LIBC
+#define LIBFOO "libnative-foo.so"
+#else
+#define LIBFOO "libfoo.so"
+#endif
+
+int main() {
+	void *foo = dlopen(LIBFOO, RTLD_NOW);
+	assert(foo);
+	dlclose(foo);
+
+	return 0;
+}