boot2

Playing with the boostrap
git clone https://git.ryansepassi.com/git/boot2.git
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features.h (500B)

      1 #ifndef FEATURES_H
      2 #define FEATURES_H
      3 
      4 #include "../../include/features.h"
      5 
      6 #define weak __attribute__((__weak__))
      7 #define hidden __attribute__((__visibility__("hidden")))
      8 /* tcc-build: tcc silently ignores __attribute__((alias(...))), leaving
      9    every weak_alias target undefined. Emit the alias as raw assembly
     10    directives, plus a plain extern decl so callers see a prototype. */
     11 #define weak_alias(old, new) \
     12 	extern __typeof(old) new; \
     13 	__asm__(".weak " #new "\n.set " #new "," #old)
     14 
     15 #endif