The kernel headers are reused from samples bpf, and autoconf.h is not enough to reflect complete configuration for clang. One of such configurations is __LINUX_ARM_ARCH__ min version used as instruction set selector. In another case an error like "SMP is not supported" for arm and others errors are issued and final object is not correct. --- samples/bpf/Makefile | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index cdd742c05200..9232efa2b1b3 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -186,6 +186,13 @@ HOSTLDLIBS_map_perf_test += -lrt HOSTLDLIBS_test_overhead += -lrt HOSTLDLIBS_xdpsock += -pthread +# Strip all expet -D options needed to handle linux headers +# for arm it's __LINUX_ARM_ARCH__ and potentially others fork vars +D_OPTIONS = $(shell echo "$(KBUILD_CFLAGS) " | sed 's/[[:blank:]]/\n/g' | \ + sed '/^-D/!d' | tr '\n' ' ') + +CLANG_EXTRA_CFLAGS += $(D_OPTIONS) + # 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
