[PATCH v4 bpf-next 05/15] samples/bpf: use __LINUX_ARM_ARCH__ selector for arm
From: Ivan Khoronzhuk <hidden>
Date: 2019-10-09 20:42:50
Also in:
lkml, netdev
Subsystem:
bpf [general] (safe dynamic programs and tools), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
For arm, -D__LINUX_ARM_ARCH__=X is min version used as instruction set selector and is absolutely required while parsing some parts of headers. It's present in KBUILD_CFLAGS but not in autoconf.h, so let's retrieve it from and add to programs cflags. In another case errors like "SMP is not supported" for armv7 and bunch of other errors are issued resulting to incorrect final object. --- samples/bpf/Makefile | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index cf882e43648a..9b33e7395eac 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile@@ -185,6 +185,14 @@ HOSTLDLIBS_map_perf_test += -lrt HOSTLDLIBS_test_overhead += -lrt HOSTLDLIBS_xdpsock += -pthread +ifeq ($(ARCH), arm) +# Strip all except -D__LINUX_ARM_ARCH__ option needed to handle linux +# headers when arm instruction set identification is requested. +ARM_ARCH_SELECTOR := $(filter -D__LINUX_ARM_ARCH__%, $(KBUILD_CFLAGS)) +BPF_EXTRA_CFLAGS := $(ARM_ARCH_SELECTOR) +KBUILD_HOSTCFLAGS += $(ARM_ARCH_SELECTOR) +endif + # Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline: # make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang LLC ?= llc
--
2.17.1