linux-kernel - [PATCH 3/3] selftests/nolibc: also test libc-test through regular selftest framework

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Message-Id: <20260106-nolibc-selftests-v1-3-f82101c2c505@weissschuh.net>
Date: Tue, 06 Jan 2026 12:44:59 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Willy Tarreau <w@....eu>, Shuah Khan <shuah@...nel.org>
Cc: linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 3/3] selftests/nolibc: also test libc-test through regular
 selftest framework

Hook up libc-test to the regular selftest build to make sure
nolibc-test.c stays compatible with a normal libc.

As the pattern rule from lib.mk does not handle compiling a target from
a differently named source file, add an explicit rule definition.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 tools/testing/selftests/nolibc/Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
index 43f0b608c796..0370489d938b 100644
--- a/tools/testing/selftests/nolibc/Makefile
+++ b/tools/testing/selftests/nolibc/Makefile
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 
-TEST_GEN_PROGS := nolibc-test
+TEST_GEN_PROGS := nolibc-test libc-test
 
 include ../lib.mk
 include $(top_srcdir)/scripts/Makefile.compiler
@@ -15,6 +15,10 @@ $(OUTPUT)/nolibc-test: CFLAGS = -nostdlib -nostdinc -static \
 $(OUTPUT)/nolibc-test: LDLIBS = $(if $(LLVM),,-lgcc)
 $(OUTPUT)/nolibc-test: nolibc-test.c nolibc-test-linkage.c | headers
 
+$(OUTPUT)/libc-test: nolibc-test.c nolibc-test-linkage.c
+	$(call msg,CC,,$@)
+	$(Q)$(LINK.c) $^ -o $@
+
 help:
 	@echo "For the custom nolibc testsuite use '$(MAKE) -f Makefile.nolibc'; available targets:"
 	@$(MAKE) -f Makefile.nolibc help

-- 
2.52.0