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Message-Id: <20230319135100.31952-2-w@1wt.eu> Date: Sun, 19 Mar 2023 14:51:00 +0100 From: Willy Tarreau <w@....eu> To: "Paul E. McKenney" <paulmck@...nel.org> Cc: linux@...ssschuh.net, linux-kernel@...r.kernel.org, Willy Tarreau <w@....eu> Subject: [PATCH 1/1] tools/nolibc: always disable stack protector for tests From: Thomas Weißschuh <linux@...ssschuh.net> 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@...ssschuh.net> Signed-off-by: Willy Tarreau <w@....eu> --- 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 8fe61d3e3cce..874d141da8c4 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),) @@ -72,6 +74,7 @@ endif CFLAGS_s390 = -m64 CFLAGS ?= -Os -fno-ident -fno-asynchronous-unwind-tables $(CFLAGS_$(ARCH)) +CFLAGS += $(call cc-option,-fno-stack-protector) LDFLAGS := -s help: -- 2.17.5
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