linux-kernel - [PATCH v2 0/3] tools/nolibc: clang LTO compatibility

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Message-Id: <20240812-nolibc-lto-v2-0-736af7bbefa8@weissschuh.net>
Date: Mon, 12 Aug 2024 22:50:16 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Willy Tarreau <w@....eu>
Cc: Ammar Faizi <ammarfaizi2@...weeb.org>, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH v2 0/3] tools/nolibc: clang LTO compatibility

A few tiny bugfixes and refactoring to provide compatibility with
clangs -flto.

$ CFLAGS_EXTRA=-flto ./run-tests.sh -m user -l       
i386:          195 test(s): 193 passed,   2 skipped,   0 failed => status: warning
x86_64:        195 test(s): 193 passed,   2 skipped,   0 failed => status: warning
arm64:         195 test(s): 193 passed,   2 skipped,   0 failed => status: warning
arm:           195 test(s): 193 passed,   2 skipped,   0 failed => status: warning
mips32le:      195 test(s): 192 passed,   3 skipped,   0 failed => status: warning
mips32be:      195 test(s): 192 passed,   3 skipped,   0 failed => status: warning
ppc:           195 test(s): 192 passed,   3 skipped,   0 failed => status: warning
ppc64:         195 test(s): 192 passed,   3 skipped,   0 failed => status: warning
ppc64le:       195 test(s): 192 passed,   3 skipped,   0 failed => status: warning
riscv:         195 test(s): 192 passed,   3 skipped,   0 failed => status: warning
s390:          195 test(s): 192 passed,   3 skipped,   0 failed => status: warning
loongarch:     195 test(s): 192 passed,   3 skipped,   0 failed => status: warning

GCC is not supported, for details read the discussion in v1 of the
series.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
Changes in v2:
- Drop GCC support
- arch-x86_64.h: Don't try to wrap the asm functions in C functions,
  Instead just replace the local symbol with a local label.
- Link to v1: https://lore.kernel.org/r/20240810-nolibc-lto-v1-0-a86e514c7fc1@weissschuh.net

---
Thomas Weißschuh (3):
      tools/nolibc: crt: mark _start_c() as used
      tools/nolibc: stackprotector: mark implicitly used symbols as used
      tools/nolibc: x86_64: use local label in memcpy/memmove

 tools/include/nolibc/arch-x86_64.h    | 4 ++--
 tools/include/nolibc/crt.h            | 2 +-
 tools/include/nolibc/stackprotector.h | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)
---
base-commit: 22ba81c50a49468d80055674d8d6f78afb1c92c4
change-id: 20240728-nolibc-lto-331813b72a0b

Best regards,
-- 
Thomas Weißschuh <linux@...ssschuh.net>