On Sun, Aug 27, 2023 at 10:00:15AM +0200, Thomas Weißschuh wrote:
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: Thomas Weißschuh linux@weissschuh.net
tools/include/nolibc/Makefile | 1 + tools/include/nolibc/stdarg.h | 16 ++++++++++++++++ 2 files changed, 17 insertions(+)
diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile index 909b6eb500fe..e69c26abe1ea 100644 --- a/tools/include/nolibc/Makefile +++ b/tools/include/nolibc/Makefile @@ -34,6 +34,7 @@ all_files := \ signal.h \ stackprotector.h \ std.h \
stdint.h \ stdlib.h \ string.h \stdarg.h \
diff --git a/tools/include/nolibc/stdarg.h b/tools/include/nolibc/stdarg.h new file mode 100644 index 000000000000..c628b5783da6 --- /dev/null +++ b/tools/include/nolibc/stdarg.h @@ -0,0 +1,16 @@ +/* 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 */
Now with your other explanation I agree, however we need to change:
#include <stdarg.h>
to
#include "stdarg.h"
in stdio.h and sys.h so that we always use ours from now on.
Willy