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From: John Hubbard <jhubbard@nvidia.com>
To: Shuah Khan <shuah@kernel.org>
Cc: angquan yu <angquan21@gmail.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Ingo Molnar <mingo@kernel.org>,
	Binbin Wu <binbin.wu@linux.intel.com>,
	Alexey Dobriyan <adobriyan@gmail.com>,
	Rick Edgecombe <rick.p.edgecombe@intel.com>,
	Sohil Mehta <sohil.mehta@intel.com>,
	Yu-cheng Yu <yu-cheng.yu@intel.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Muhammad Usama Anjum <usama.anjum@collabora.com>,
	Valentin Obst <kernel@valentinobst.de>,
	linux-kselftest@vger.kernel.org,
	LKML <linux-kernel@vger.kernel.org>,
	llvm@lists.linux.dev,
	x86@kernel.org,
	John Hubbard <jhubbard@nvidia.com>
Subject: [PATCH v3 5/7] selftests/x86: avoid -no-pie warnings from clang during compilation
Date: Fri, 31 May 2024 12:38:36 -0700
Message-ID: <20240531193838.108454-6-jhubbard@nvidia.com>
In-Reply-To: <20240531193838.108454-1-jhubbard@nvidia.com>
References: <20240531193838.108454-1-jhubbard@nvidia.com>
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When building with clang, via:

    make LLVM=1 -C tools/testing/selftests

...clang warns that -no-pie is "unused during compilation".

This occurs because clang only wants to see -no-pie during linking.
Here, we don't have a separate linking stage, so a compiler warning is
unavoidable without (wastefully) restructuring the Makefile.

Avoid the warning by simply disabling that warning, for clang builds.

Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 tools/testing/selftests/x86/Makefile | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile
index d0bb32bd5538..5c8757a25998 100644
--- a/tools/testing/selftests/x86/Makefile
+++ b/tools/testing/selftests/x86/Makefile
@@ -40,6 +40,13 @@ CFLAGS := -O2 -g -std=gnu99 -pthread -Wall $(KHDR_INCLUDES)
 # call32_from_64 in thunks.S uses absolute addresses.
 ifeq ($(CAN_BUILD_WITH_NOPIE),1)
 CFLAGS += -no-pie
+
+ifneq ($(LLVM),)
+# clang only wants to see -no-pie during linking. Here, we don't have a separate
+# linking stage, so a compiler warning is unavoidable without (wastefully)
+# restructuring the Makefile. Avoid this by simply disabling that warning.
+CFLAGS += -Wno-unused-command-line-argument
+endif
 endif
 
 define gen-target-rule-32
-- 
2.45.1