tinycc/tests/tests2/120+_alias.c

extern int printf (const char *, ...);
extern void target(void);
extern void alias_for_target(void);
extern void asm_for_target(void);

void inunit2(void);

void inunit2(void)
{
  target();
  alias_for_target();
  /* This symbol is not supposed to be available in this unit:
     asm_for_target();
   */
}
Reinstate attribute alias handling commit 2a0167a merged alias and asm symbol renaming, but broke semantics of aliases, see testcase. Basically the difference between the two is that an asm rename doesn't generate a new symbol, i.e. with int foo __asm__("bar"); all source reference to 'foo' will be to 'bar', nothing of the name 'foo' will remain in the object file, and for instance reference to 'foo' from other compilation units won't be resolved to this one. Aliases OTOH create an additional symbol. With: void target (void) { return; } void afunc (void) __attribute__((alias("target"))); reference to 'afunc' will remain 'afunc' in the object file. It will generate two symbols, 'afunc' and 'target' referring to the same entity. This difference matters if other compilation units make references to 'afunc'. A side requirement of this is that for alias to work that the target symbol needs to be defined in the same unit. For TCC we even require a stricter variant: it must be defined before the alias is created. Now, with this I merely re-instated the old flow of events before above commit. It didn't seem useful anymore to place both names in the asm_label member of attributes, and the asm_label member of Sym now again only needs the hold the __asm__ rename. It also follows that tcc_predefs.h can't make use of attribute alias to e.g. map __builtin_memcpy to __bound_memcpy (simply because the latter isn't defined in all units), but rather must use __asm__ renaming, which in turn means that the underscore handling needs to be done by hand. 2020-09-30 23:46:01 +08:00			`extern int printf (const char *, ...);`
			`extern void target(void);`
			`extern void alias_for_target(void);`
			`extern void asm_for_target(void);`

			`void inunit2(void);`

			`void inunit2(void)`
			`{`
			`target();`
			`alias_for_target();`
			`/* This symbol is not supposed to be available in this unit:`
			`asm_for_target();`
			`*/`
			`}`