From cdbc4e3399ed8cdcf234a85f7a2482b622379e82 Mon Sep 17 00:00:00 2001 From: Connor O'Brien Date: Wed, 12 Jan 2022 00:25:03 +0000 Subject: [PATCH] tools/resolve_btfids: Build with host flags resolve_btfids is built using $(HOSTCC) and $(HOSTLD) but does not pick up the corresponding flags. As a result, host-specific settings (such as a sysroot specified via HOSTCFLAGS=--sysroot=..., or a linker specified via HOSTLDFLAGS=-fuse-ld=...) will not be respected. Fix this by setting CFLAGS to KBUILD_HOSTCFLAGS and LDFLAGS to KBUILD_HOSTLDFLAGS. Also pass the cflags through to libbpf via EXTRA_CFLAGS to ensure that the host libbpf is built with flags consistent with resolve_btfids. Signed-off-by: Connor O'Brien Signed-off-by: Andrii Nakryiko Acked-by: Song Liu Link: https://lore.kernel.org/bpf/20220112002503.115968-1-connoro@google.com (cherry picked from commit 0e3a1c902ffb56e9fe4416f0cd382c97b09ecbf6) Signed-off-by: Stijn Tintel --- tools/bpf/resolve_btfids/Makefile | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/tools/bpf/resolve_btfids/Makefile +++ b/tools/bpf/resolve_btfids/Makefile @@ -23,6 +23,8 @@ CC = $(HOSTCC) LD = $(HOSTLD) ARCH = $(HOSTARCH) RM ?= rm +CFLAGS := $(KBUILD_HOSTCFLAGS) +LDFLAGS := $(KBUILD_HOSTLDFLAGS) OUTPUT ?= $(srctree)/tools/bpf/resolve_btfids/ @@ -45,9 +47,9 @@ $(SUBCMDOBJ): fixdep FORCE | $(OUTPUT)/l $(Q)$(MAKE) -C $(SUBCMD_SRC) OUTPUT=$(abspath $(dir $@))/ $(abspath $@) $(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(OUTPUT)/libbpf - $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) OUTPUT=$(abspath $(dir $@))/ $(abspath $@) + $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) OUTPUT=$(abspath $(dir $@))/ EXTRA_CFLAGS="$(CFLAGS)" $(abspath $@) -CFLAGS := -g \ +CFLAGS += -g \ -I$(srctree)/tools/include \ -I$(srctree)/tools/include/uapi \ -I$(LIBBPF_SRC) \