linux-kernel - [PATCH v3 05/16] kbuild: introduce CONFIG_ARCH_HAS

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Message-Id: <20250611-kunit-kselftests-v3-5-55e3d148cbc6@linutronix.de>
Date: Wed, 11 Jun 2025 09:38:11 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Masahiro Yamada <masahiroy@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, 
 Andrew Morton <akpm@...ux-foundation.org>, Willy Tarreau <w@....eu>, 
 Thomas Weißschuh <linux@...ssschuh.net>, 
 Brendan Higgins <brendan.higgins@...ux.dev>, 
 David Gow <davidgow@...gle.com>, Rae Moar <rmoar@...gle.com>, 
 Shuah Khan <shuah@...nel.org>, Jonathan Corbet <corbet@....net>, 
 Nicolas Schier <nicolas.schier@...ux.dev>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>, Nicolas Schier <nicolas.schier@...ux.dev>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>, 
 linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com, 
 linux-doc@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 workflows@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>, 
 Nicolas Schier <nicolas.schier@...ux.dev>
Subject: [PATCH v3 05/16] kbuild: introduce CONFIG_ARCH_HAS_NOLIBC

Nolibc does not support all architectures.
Add a kconfig option, so users can know where it is available.

The new option is maintained inside tools/include/nolibc/ as only that
directory is responsible for nolibc's availability.

Reviewed-by: Nicolas Schier <n.schier@....de>
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 init/Kconfig                        |  2 ++
 tools/include/nolibc/Kconfig.nolibc | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/init/Kconfig b/init/Kconfig
index 26cafbad4f1560fb56b4bef31ae29baf54175661..6d10f2816e453d1d28e4b8249cbbd95c28baa0f1 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -92,6 +92,8 @@ config CC_CAN_LINK_STATIC
 	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAGS) $(m64-flag) -static) if 64BIT
 	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAGS) $(m32-flag) -static)
 
+source "tools/include/nolibc/Kconfig.nolibc"
+
 # Fixed in GCC 14, 13.3, 12.4 and 11.5
 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113921
 config GCC_ASM_GOTO_OUTPUT_BROKEN
diff --git a/tools/include/nolibc/Kconfig.nolibc b/tools/include/nolibc/Kconfig.nolibc
new file mode 100644
index 0000000000000000000000000000000000000000..29cbc5437e70cbc5e256f00b74d0ab4801b40de7
--- /dev/null
+++ b/tools/include/nolibc/Kconfig.nolibc
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config ARCH_HAS_NOLIBC
+	bool
+	default y if ARM
+	default y if ARM64
+	default y if LOONGARCH
+	default y if M68K
+	default y if MIPS
+	default y if PPC
+	default y if RISCV
+	default y if S390
+	default y if SPARC
+	default y if UML_X86
+	default y if X86

-- 
2.49.0