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[bpf-next,5/6] tools/runqslower: Enable cross-building with clang

Message ID 20211122192019.1277299-6-jean-philippe@linaro.org (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series tools/bpf: Enable cross-building with clang | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for bpf-next
netdev/apply fail Patch does not apply to bpf-next
bpf/vmtest-bpf-next-PR fail merge-conflict

Commit Message

Jean-Philippe Brucker Nov. 22, 2021, 7:20 p.m. UTC 
Cross-building using clang requires passing the "-target" flag rather
than using the CROSS_COMPILE prefix. Makefile.include transforms
CROSS_COMPILE into CLANG_CROSS_FLAGS. Add them to CFLAGS, and erase
CROSS_COMPILE for the bpftool build, since it needs to be executed on
the host.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
 tools/bpf/runqslower/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/tools/bpf/runqslower/Makefile b/tools/bpf/runqslower/Makefile
index 8791d0e2762b..da6de16a3dfb 100644
--- a/tools/bpf/runqslower/Makefile
+++ b/tools/bpf/runqslower/Makefile
@@ -12,7 +12,7 @@  BPFOBJ := $(BPFOBJ_OUTPUT)libbpf.a
 BPF_DESTDIR := $(BPFOBJ_OUTPUT)
 BPF_INCLUDE := $(BPF_DESTDIR)/include
 INCLUDES := -I$(OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../include/uapi)
-CFLAGS := -g -Wall
+CFLAGS := -g -Wall $(CLANG_CROSS_FLAGS)
 
 # Try to detect best kernel BTF source
 KERNEL_REL := $(shell uname -r)
@@ -88,4 +88,4 @@  $(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(BPFOBJ_OU
 
 $(DEFAULT_BPFTOOL): $(BPFOBJ) | $(BPFTOOL_OUTPUT)
 	$(Q)$(MAKE) $(submake_extras) -C ../bpftool OUTPUT=$(BPFTOOL_OUTPUT)   \
-		    CC=$(HOSTCC) LD=$(HOSTLD)
+		    ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD)