user: implement mlibc as the libc, finally.

It's finally done..

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

ext2_root/usr/include/assert.h

@@ -0,0 +1,46 @@
+
+#ifndef _ASSERT_H
+#define _ASSERT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef __MLIBC_ABI_ONLY
+
+/* NOTE: This is not ISO C. Declared in LSB */
+__attribute__ ((__noreturn__)) void __assert_fail(const char *assertion, const char *file, unsigned int line,
+		const char *function);
+
+#endif /* !__MLIBC_ABI_ONLY */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ASSERT_H */
+
+#include <mlibc-config.h>
+
+#if __MLIBC_GLIBC_OPTION
+#	include <bits/glibc/glibc_assert.h>
+#endif
+
+/* NOTE: [7.2] requires this be outside the include guard */
+#ifdef NDEBUG
+
+#undef assert
+#define assert(ignore) ((void)0)
+
+#else /* NDEBUG */
+
+#undef assert
+#define assert(assertion) ((void)((assertion) \
+		|| (__assert_fail(#assertion, __FILE__, __LINE__, __func__), 0)))
+
+#endif /* NDEBUG */
+
+#ifndef __cplusplus
+#undef static_assert
+#define static_assert _Static_assert
+#endif