Commit b56a9492 authored by Thomas Weißschuh's avatar Thomas Weißschuh
Browse files

tools/nolibc: add stdarg.h header 



This allows nolic to work with `-nostdinc` avoiding any reliance on
system headers.

The implementation has been lifted from musl libc 1.2.4.
There is already an implementation of stdarg.h in include/linux/stdarg.h
but that is GPL licensed and therefore not suitable for nolibc.

The used compiler builtins have been validated to be at least available
since GCC 4.1.2 and clang 3.0.0.

Signed-off-by: default avatarThomas Weißschuh <linux@weissschuh.net>
Signed-off-by: default avatarWilly Tarreau <w@1wt.eu>
parent 92199222

tools/include/nolibc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ all_files := \ 
		signal.h \

		stackprotector.h \

		std.h \

		stdarg.h \

		stdint.h \

		stdlib.h \

		string.h \

tools/include/nolibc/nolibc.h

+2 −2
Original line number Diff line number Diff line
@@ -74,10 +74,10 @@ 
 *            -I../nolibc -o hello hello.c -lgcc

 *

 * The available standard (but limited) include files are:

 *   ctype.h, errno.h, signal.h, stdio.h, stdlib.h, string.h, time.h

 *   ctype.h, errno.h, signal.h, stdarg.h, stdio.h, stdlib.h, string.h, time.h

 *

 * In addition, the following ones are expected to be provided by the compiler:

 *   float.h, stdarg.h, stddef.h

 *   float.h, stddef.h

 *

 * The following ones which are part to the C standard are not provided:

 *   assert.h, locale.h, math.h, setjmp.h, limits.h

tools/include/nolibc/stdarg.h

0 → 100644
+16 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */

/*

 * Variadic argument support for NOLIBC

 * Copyright (C) 2005-2020 Rich Felker, et al.

 */



#ifndef _NOLIBC_STDARG_H

#define _NOLIBC_STDARG_H



typedef __builtin_va_list va_list;

#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)



#endif /* _NOLIBC_STDARG_H */

tools/include/nolibc/stdio.h

+1 −2
Original line number Diff line number Diff line
@@ -7,13 +7,12 @@ 
#ifndef _NOLIBC_STDIO_H

#define _NOLIBC_STDIO_H



#include <stdarg.h>



#include "std.h"

#include "arch.h"

#include "errno.h"

#include "types.h"

#include "sys.h"

#include "stdarg.h"

#include "stdlib.h"

#include "string.h"

tools/include/nolibc/sys.h

+1 −1
Original line number Diff line number Diff line
@@ -7,7 +7,6 @@ 
#ifndef _NOLIBC_SYS_H

#define _NOLIBC_SYS_H



#include <stdarg.h>

#include "std.h"



/* system includes */
@@ -25,6 +24,7 @@ 


#include "arch.h"

#include "errno.h"

#include "stdarg.h"

#include "types.h"