linux-kernel - [PATCH] perf build: Allow using compiler wrappers with CLANG

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Message-ID: <20250805121143.1224807-1-iii@linux.ibm.com>
Date: Tue,  5 Aug 2025 14:09:34 +0200
From: Ilya Leoshkevich <iii@...ux.ibm.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Ilya Leoshkevich <iii@...ux.ibm.com>
Subject: [PATCH] perf build: Allow using compiler wrappers with CLANG

It is useful to specify CLANG="ccache clang" in order to speed up
builds. Unfortunately perf's compiler detection logic does not like
this:

    Makefile.config:704: Warning: Disabled BPF skeletons as clang (ccache clang) is missing

We don't need to know the full path to $(CLANG), so using
get-executable is not necessary. Fix by trying to run
`$(CLANG) --version` instead.

Signed-off-by: Ilya Leoshkevich <iii@...ux.ibm.com>
---
 tools/perf/Makefile.config | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 5a5832ee7b53..4bc11db5aa4d 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -700,7 +700,7 @@ ifeq ($(BUILD_BPF_SKEL),1)
   else ifeq ($(filter -DHAVE_LIBBPF_SUPPORT, $(CFLAGS)),)
     $(warning Warning: Disabled BPF skeletons as libbpf is required)
     BUILD_BPF_SKEL := 0
-  else ifeq ($(call get-executable,$(CLANG)),)
+  else ifneq ($(shell $(CLANG) --version >/dev/null 2>&1; echo $$?),0)
     $(warning Warning: Disabled BPF skeletons as clang ($(CLANG)) is missing)
     BUILD_BPF_SKEL := 0
   else
-- 
2.50.1