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tools/resolve_btfids: Support cross-building the kernel with clang

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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>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20211216163842.829836-3-jean-philippe@linaro.org
This commit is contained in:
Jean-Philippe Brucker 2021-12-16 16:38:39 +00:00 • committed by Andrii Nakryiko
parent cebdb73745
commit bf1be90346
1 changed files with 1 additions and 0 deletions
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tools/bpf/resolve_btfids/Makefile
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@ -19,6 +19,7 @@ CC = $(HOSTCC)
LD = $(HOSTLD)
ARCH = $(HOSTARCH)
RM ?= rm
CROSS_COMPILE =
OUTPUT ?= $(srctree)/tools/bpf/resolve_btfids/