Stack protectors need support from libc. This support is not provided by nolibc which leads to compiler errors when stack protectors are enabled by default in a compiler:

CC nolibc-test /usr/bin/ld: /tmp/ccqbHEPk.o: in function `stat': nolibc-test.c:(.text+0x1d1): undefined reference to `__stack_chk_fail' /usr/bin/ld: /tmp/ccqbHEPk.o: in function `poll.constprop.0': nolibc-test.c:(.text+0x37b): undefined reference to `__stack_chk_fail' /usr/bin/ld: /tmp/ccqbHEPk.o: in function `vfprintf.constprop.0': nolibc-test.c:(.text+0x712): undefined reference to `__stack_chk_fail' /usr/bin/ld: /tmp/ccqbHEPk.o: in function `pad_spc.constprop.0': nolibc-test.c:(.text+0x80d): undefined reference to `__stack_chk_fail' /usr/bin/ld: /tmp/ccqbHEPk.o: in function `printf': nolibc-test.c:(.text+0x8c4): undefined reference to `__stack_chk_fail' /usr/bin/ld: /tmp/ccqbHEPk.o:nolibc-test.c:(.text+0x12d4): more undefined references to `__stack_chk_fail' follow collect2: error: ld returned 1 exit status

Signed-off-by: Thomas Weißschuh linux@weissschuh.net --- tools/testing/selftests/nolibc/Makefile | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile index 22f1e1d73fa8..ec724e445b5a 100644 --- a/tools/testing/selftests/nolibc/Makefile +++ b/tools/testing/selftests/nolibc/Makefile @@ -1,6 +1,8 @@ # SPDX-License-Identifier: GPL-2.0 # Makefile for nolibc tests include ../../../scripts/Makefile.include +# We need this for the "cc-option" macro. +include ../../../build/Build.include

# we're in ".../tools/testing/selftests/nolibc" ifeq ($(srctree),) @@ -63,6 +65,7 @@ Q=@ endif

CFLAGS ?= -Os -fno-ident -fno-asynchronous-unwind-tables +CFLAGS += $(call cc-option,-fno-stack-protector) LDFLAGS := -s

help:

--- base-commit: 3f0b0903fde584a7398f82fc00bf4f8138610b87 change-id: 20230221-nolibc-no-stack-protector-5b54d2be4c61

Best regards,