Merge tag 'nolibc.2023.10.23a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

Pull nolibc updates from Paul McKenney:

 - Add stdarg.h header and a few additional system-call upgrades

 - Add support for constructors and destructors

 - Add tests to verify the ability to link multiple .o files against
   nolibc

 - Numerous string-function optimizations and improvements

 - Prevent redundant kernel relinks by avoiding embedding of initramfs
   into the kernel image

 - Allow building i386 with multiarch compiler and make ppc64le use
   qemu-system-ppc64

 - Miscellaneous fixups, including addition of -nostdinc for
   nolibc-test, avoiding -Wstringop-overflow warnings, and avoiding
   unused parameter warnings for ENOSYS fallbacks

* tag 'nolibc.2023.10.23a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
  selftests/nolibc: add tests for multi-object linkage
  selftests/nolibc: use qemu-system-ppc64 for ppc64le
  tools/nolibc: add support for constructors and destructors
  tools/nolibc: drop test for getauxval(AT_PAGESZ)
  tools/nolibc: automatically detect necessity to use pselect6
  tools/nolibc: don't define new syscall number
  tools/nolibc: avoid unused parameter warnings for ENOSYS fallbacks
  selftests/nolibc: allow building i386 with multiarch compiler
  selftests/nolibc: don't embed initramfs into kernel image
  selftests/nolibc: libc-test: avoid -Wstringop-overflow warnings
  tools/nolibc: string: Remove the `_nolibc_memcpy_up()` function
  tools/nolibc: string: Remove the `_nolibc_memcpy_down()` function
  tools/nolibc: x86-64: Use `rep stosb` for `memset()`
  tools/nolibc: x86-64: Use `rep movsb` for `memcpy()` and `memmove()`
  selftests/nolibc: use -nostdinc for nolibc-test
  tools/nolibc: add stdarg.h header

1 files changed, 16 insertions, 0 deletions

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 */