From: Jean-Philippe Brucker <jean-philippe@linaro.org>
To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
shuah@kernel.org, nathan@kernel.org, ndesaulniers@google.com
Cc: kafai@fb.com, songliubraving@fb.com, yhs@fb.com,
john.fastabend@gmail.com, kpsingh@kernel.org,
bpf@vger.kernel.org, linux-kselftest@vger.kernel.org,
llvm@lists.linux.dev,
Jean-Philippe Brucker <jean-philippe@linaro.org>
Subject: [PATCH bpf-next 2/6] tools/resolve_btfids: Support cross-building the kernel with clang
Date: Mon, 22 Nov 2021 19:20:16 +0000 [thread overview]
Message-ID: <20211122192019.1277299-3-jean-philippe@linaro.org> (raw)
In-Reply-To: <20211122192019.1277299-1-jean-philippe@linaro.org>
The CROSS_COMPILE variable may be present during resolve_btfids build if
the kernel is being cross-built. Since resolve_btfids is always executed
on the host, we set CC to HOSTCC in order to use the host toolchain when
cross-building with GCC. But instead of a toolchain prefix, cross-build
with clang uses a "-target" parameter, which Makefile.include deduces
from the CROSS_COMPILE variable. In order to avoid cross-building
libbpf, clear CROSS_COMPILE before building resolve_btfids.
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
tools/bpf/resolve_btfids/Makefile | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/bpf/resolve_btfids/Makefile b/tools/bpf/resolve_btfids/Makefile
index 751643f860b2..9ddeca947635 100644
--- a/tools/bpf/resolve_btfids/Makefile
+++ b/tools/bpf/resolve_btfids/Makefile
@@ -19,6 +19,7 @@ CC = $(HOSTCC)
LD = $(HOSTLD)
ARCH = $(HOSTARCH)
RM ?= rm
+CROSS_COMPILE =
OUTPUT ?= $(srctree)/tools/bpf/resolve_btfids/
--
2.33.1
next prev parent reply other threads:[~2021-11-22 19:23 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-22 19:20 [PATCH bpf-next 0/6] tools/bpf: Enable cross-building with clang Jean-Philippe Brucker
2021-11-22 19:20 ` [PATCH bpf-next 1/6] tools: Help " Jean-Philippe Brucker
2021-11-22 19:20 ` Jean-Philippe Brucker [this message]
2021-11-22 19:20 ` [PATCH bpf-next 3/6] tools/libbpf: Enable " Jean-Philippe Brucker
2021-11-29 23:51 ` Andrii Nakryiko
2021-11-22 19:20 ` [PATCH bpf-next 4/6] bpftool: " Jean-Philippe Brucker
2021-11-29 23:53 ` Andrii Nakryiko
2021-11-22 19:20 ` [PATCH bpf-next 5/6] tools/runqslower: " Jean-Philippe Brucker
2021-11-22 19:20 ` [PATCH bpf-next 6/6] selftests/bpf: " Jean-Philippe Brucker
2021-11-26 20:36 ` [PATCH bpf-next 0/6] tools/bpf: " Quentin Monnet
2021-11-26 21:15 ` Daniel Borkmann
2021-11-29 9:42 ` Jean-Philippe Brucker
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