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| author |   Alexander Lobakin <alexandr.lobakin@intel.com> | 2021-12-03 20:50:03 +0100 |
|---|---|---|
| committer |   Andrii Nakryiko <andrii@kernel.org> | 2021-12-06 19:33:44 -0800 |
| commit | e64fbcaa7a666f16329b1c67af15ea501bc84586 (patch) | |
| tree | f7ba2b48adc924b043079f23f9996b18b9319ff8 /samples | |
| parent | bpf: Silence purge_cand_cache build warning. (diff) | |
| download | linux-dev-e64fbcaa7a666f16329b1c67af15ea501bc84586.tar.xz linux-dev-e64fbcaa7a666f16329b1c67af15ea501bc84586.zip | |
samples: bpf: Fix xdp_sample_user.o linking with Clang
Clang (13) doesn't get the jokes about specifying libraries to link in
cclags of individual .o objects:
clang-13: warning: -lm: 'linker' input unused [-Wunused-command-line-argument]
[ ... ]
LD samples/bpf/xdp_redirect_cpu
LD samples/bpf/xdp_redirect_map_multi
LD samples/bpf/xdp_redirect_map
LD samples/bpf/xdp_redirect
LD samples/bpf/xdp_monitor
/usr/bin/ld: samples/bpf/xdp_sample_user.o: in function `sample_summary_print':
xdp_sample_user.c:(.text+0x84c): undefined reference to `floor'
/usr/bin/ld: xdp_sample_user.c:(.text+0x870): undefined reference to `ceil'
/usr/bin/ld: xdp_sample_user.c:(.text+0x8cf): undefined reference to `floor'
/usr/bin/ld: xdp_sample_user.c:(.text+0x8f3): undefined reference to `ceil'
[ more ]
Specify '-lm' as ldflags for all xdp_sample_user.o users in the main
Makefile and remove it from ccflags of ^ in Makefile.target -- just
like it's done for all other samples. This works with all compilers.
Fixes: 6e1051a54e31 ("samples: bpf: Convert xdp_monitor to XDP samples helper")
Fixes: b926c55d856c ("samples: bpf: Convert xdp_redirect to XDP samples helper")
Fixes: e531a220cc59 ("samples: bpf: Convert xdp_redirect_cpu to XDP samples helper")
Fixes: bbe65865aa05 ("samples: bpf: Convert xdp_redirect_map to XDP samples helper")
Fixes: 594a116b2aa1 ("samples: bpf: Convert xdp_redirect_map_multi to XDP samples helper")
Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/bpf/20211203195004.5803-2-alexandr.lobakin@intel.com
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/bpf/Makefile | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index 6ae62b1dc938..38638845db9d 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -215,6 +215,11 @@ TPROGS_LDFLAGS := -L$(SYSROOT)/usr/lib endif TPROGS_LDLIBS += $(LIBBPF) -lelf -lz +TPROGLDLIBS_xdp_monitor += -lm +TPROGLDLIBS_xdp_redirect += -lm +TPROGLDLIBS_xdp_redirect_cpu += -lm +TPROGLDLIBS_xdp_redirect_map += -lm +TPROGLDLIBS_xdp_redirect_map_multi += -lm TPROGLDLIBS_tracex4 += -lrt TPROGLDLIBS_trace_output += -lrt TPROGLDLIBS_map_perf_test += -lrt @@ -345,7 +350,7 @@ $(obj)/hbm_edt_kern.o: $(src)/hbm.h $(src)/hbm_kern.h # Override includes for xdp_sample_user.o because $(srctree)/usr/include in # TPROGS_CFLAGS causes conflicts -XDP_SAMPLE_CFLAGS += -Wall -O2 -lm \ +XDP_SAMPLE_CFLAGS += -Wall -O2 \ -I$(src)/../../tools/include \ -I$(src)/../../tools/include/uapi \ -I$(LIBBPF_INCLUDE) \ |