Revert "perf build: Warn for BPF skeletons if endian mismatches"

This reverts commit 51924ae6.

We need to better polish building with BPF skels, so revert back to
making it an experimental feature that has to be explicitely enabled
using BUILD_BPF_SKEL=1.
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
上级 6c73f819
......@@ -663,17 +663,14 @@ ifndef NO_BPF_SKEL
$(call feature_check,clang-bpf-co-re)
ifeq ($(feature-clang-bpf-co-re), 0)
dummy := $(error: ERROR: BPF skeletons unsupported. clang too old/not installed or build with NO_BPF_SKEL=1.)
else
ifeq ($(filter -DHAVE_LIBBPF_SUPPORT, $(CFLAGS)),)
dummy := $(error: ERROR: BPF skeletons unsupported. BPF skeleton support requires libbpf or build with NO_BPF_SKEL=1.)
else
$(call detected,CONFIG_PERF_BPF_SKEL)
CFLAGS += -DHAVE_BPF_SKEL
endif
endif
ifeq ($(filter -DHAVE_LIBBPF_SUPPORT, $(CFLAGS)),)
dummy := $(error: ERROR: BPF skeletons unsupported. BPF skeleton support requires libbpf or build with NO_BPF_SKEL=1.)
endif
host_byte_order=$(echo ""|$(HOSTCC) -dM -E -|grep __BYTE_ORDER__)
target_byte_order=$(echo ""|$(CC) -dM -E -|grep __BYTE_ORDER__)
ifneq ($(host_byte_order), $(target_byte_order))
$(warning Possibly mismatched host and target endianness may break BPF skeletons)
endif
$(call detected,CONFIG_PERF_BPF_SKEL)
CFLAGS += -DHAVE_BPF_SKEL
endif
dwarf-post-unwind := 1
......
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