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remove legacy i386 fallback stdarg implementation and framework

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this has been slated for removal for a long time. there is
fundamentally no way to implement stdarg without compiler assistance;
any attempt to do so has serious undefined behavior; its working
depends not just (as a common misconception goes) on ABI, but also on
assumptions about compiler code generation internal to a translation
unit, which is not subject to external ABI constraints.
This commit is contained in:
Rich Felker 2016-12-15 12:18:24 -05:00
parent 6f1866768a
commit ffaaa6d230
3 changed files with 0 additions and 17 deletions
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4
arch/generic/bits/stdarg.h
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@ -1,4 +0,0 @@
#define va_start(v,l) __builtin_va_start(v,l)
#define va_end(v) __builtin_va_end(v)
#define va_arg(v,l) __builtin_va_arg(v,l)
#define va_copy(d,s) __builtin_va_copy(d,s)

9
arch/i386/bits/stdarg.h
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@ -1,9 +0,0 @@
#define __VA_ALIGNED_SIZE(x) ((sizeof(x) + sizeof(int) - 1) & ~(sizeof(int) - 1))
#define va_start(ap, last) ((ap) = (void *)(((char *)&(last)) + __VA_ALIGNED_SIZE(last)))
#define va_end(ap) ((void)0)
#define va_copy(dest, src) ((dest) = (src))
#define va_arg(ap, type) \
( ((ap) = (va_list)((char *)(ap) + __VA_ALIGNED_SIZE(type))), \
*(type *)(void *)((char *)(ap) - __VA_ALIGNED_SIZE(type)) )

4
include/stdarg.h
View File

@ -9,14 +9,10 @@ extern "C" {
#include <bits/alltypes.h>
#if __GNUC__ >= 3
#define va_start(v,l) __builtin_va_start(v,l)
#define va_end(v) __builtin_va_end(v)
#define va_arg(v,l) __builtin_va_arg(v,l)
#define va_copy(d,s) __builtin_va_copy(d,s)
#else
#include <bits/stdarg.h>
#endif
#ifdef __cplusplus
}