diff options
| author | Jakub Kicinski | 2019-06-05 16:47:22 -0700 |
|---|---|---|
| committer | Daniel Borkmann | 2019-06-06 02:15:14 +0200 |
| commit | 07c3bbdb1a9b2046631a2a2950a0c16e10cfcab3 (patch) | |
| tree | d00d4c0e183e8d2bec44f7c88e745349f394fc97 /samples/bpf | |
| parent | 6685699e4ef5e9903d5c8bc6c2e6e13b931c98e1 (diff) | |
samples: bpf: print a warning about headers_install
It seems like periodically someone posts patches to "fix"
header includes. The issue is that samples expect the
include path to have the uAPI headers (from usr/) first,
and then tools/ headers, so that locally installed uAPI
headers take precedence. This means that if users didn't
run headers_install they will see all sort of strange
compilation errors, e.g.:
HOSTCC samples/bpf/test_lru_dist
samples/bpf/test_lru_dist.c:39:8: error: redefinition of ‘struct list_head’
struct list_head {
^~~~~~~~~
In file included from samples/bpf/test_lru_dist.c:9:0:
../tools/include/linux/types.h:69:8: note: originally defined here
struct list_head {
^~~~~~~~~
Try to detect this situation, and print a helpful warning.
v2: just use HOSTCC (Jiong).
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'samples/bpf')
| -rw-r--r-- | samples/bpf/Makefile | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index 253e5a2856be..4074a66a70ca 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -206,6 +206,15 @@ HOSTCC = $(CROSS_COMPILE)gcc CLANG_ARCH_ARGS = -target $(ARCH) endif +HDR_PROBE := $(shell echo "\#include <linux/types.h>\n struct list_head { int a; }; int main() { return 0; }" | \ + $(HOSTCC) $(KBUILD_HOSTCFLAGS) -x c - -o /dev/null 2>/dev/null && \ + echo okay) + +ifeq ($(HDR_PROBE),) +$(warning WARNING: Detected possible issues with include path.) +$(warning WARNING: Please install kernel headers locally (make headers_install).) +endif + BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris) BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF) BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm') |