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authorAlexander Lobakin <alexandr.lobakin@intel.com>2021-12-03 20:50:03 +0100
committerAndrii Nakryiko <andrii@kernel.org>2021-12-06 19:33:44 -0800
commite64fbcaa7a666f16329b1c67af15ea501bc84586 (patch)
treef7ba2b48adc924b043079f23f9996b18b9319ff8 /samples
parent29f2e5bd9439445fe14ba8570b1c9a7ad682df84 (diff)
downloadlinux-e64fbcaa7a666f16329b1c67af15ea501bc84586.tar.bz2
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/Makefile7
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) \