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[bpf-next,v2,2/6] tools/resolve_btfids: Support cross-building the kernel with clang

Message ID 20211216163842.829836-3-jean-philippe@linaro.org (mailing list archive)
State Accepted
Commit bf1be903461a404a9d1c720b0872501ca35abc89
Headers show
Series tools/bpf: Enable cross-building with clang | expand

Commit Message

Jean-Philippe Brucker Dec. 16, 2021, 4:38 p.m. UTC 
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.

Acked-by: Quentin Monnet <quentin@isovalent.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
 tools/bpf/resolve_btfids/Makefile | 1 +
 1 file changed, 1 insertion(+)
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Patch

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/