Merge tag 'nolibc.2023.02.06a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

Pull nolibc updates from Paul McKenney:

 - Add s390 support

 - Add support for the ARM Thumb1 instruction set

 - Fix O_* flags definitions for open() and fcntl()

 - Make errno a weak symbol instead of a static variable

 - Export environ as a weak symbol

 - Export _auxv as a weak symbol for auxilliary vector retrieval

 - Implement getauxval() and getpagesize()

 - Further improve self tests, including permitting userland testing of
   the nolibc library

* tag 'nolibc.2023.02.06a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: (28 commits)
  selftests/nolibc: Add a "run-user" target to test the program in user land
  selftests/nolibc: Support "x86_64" for arch name
  selftests/nolibc: Add `getpagesize(2)` selftest
  nolibc/sys: Implement `getpagesize(2)` function
  nolibc/stdlib: Implement `getauxval(3)` function
  tools/nolibc: add auxiliary vector retrieval for s390
  tools/nolibc: add auxiliary vector retrieval for mips
  tools/nolibc: add auxiliary vector retrieval for riscv
  tools/nolibc: add auxiliary vector retrieval for arm
  tools/nolibc: add auxiliary vector retrieval for arm64
  tools/nolibc: add auxiliary vector retrieval for x86_64
  tools/nolibc: add auxiliary vector retrieval for i386
  tools/nolibc: export environ as a weak symbol on s390
  tools/nolibc: export environ as a weak symbol on riscv
  tools/nolibc: export environ as a weak symbol on mips
  tools/nolibc: export environ as a weak symbol on arm
  tools/nolibc: export environ as a weak symbol on arm64
  tools/nolibc: export environ as a weak symbol on i386
  tools/nolibc: export environ as a weak symbol on x86_64
  tools/nolibc: make errno a weak symbol instead of a static one
  ...

1 files changed, 1 insertions, 3 deletions

diff --git a/tools/include/nolibc/errno.h b/tools/include/nolibc/errno.h
index 9dc4919c769b..a44486ff0477 100644
--- a/tools/include/nolibc/errno.h
+++ b/tools/include/nolibc/errno.h
@@ -9,11 +9,9 @@
 
 #include <asm/errno.h>
 
-/* this way it will be removed if unused */
-static int errno;
-
 #ifndef NOLIBC_IGNORE_ERRNO
 #define SET_ERRNO(v) do { errno = (v); } while (0)
+int errno __attribute__((weak));
 #else
 #define SET_ERRNO(v) do { } while (0)
 #endif