target/linux/generic/backport-5.10/200-v5.18-tools-resolve_btfids-Build-with-host-flags.patch

   1 From cdbc4e3399ed8cdcf234a85f7a2482b622379e82 Mon Sep 17 00:00:00 2001
   2 From: Connor O'Brien <connoro@google.com>
   3 Date: Wed, 12 Jan 2022 00:25:03 +0000
   4 Subject: [PATCH] tools/resolve_btfids: Build with host flags
   5
   6 resolve_btfids is built using $(HOSTCC) and $(HOSTLD) but does not
   7 pick up the corresponding flags. As a result, host-specific settings
   8 (such as a sysroot specified via HOSTCFLAGS=--sysroot=..., or a linker
   9 specified via HOSTLDFLAGS=-fuse-ld=...) will not be respected.
  10
  11 Fix this by setting CFLAGS to KBUILD_HOSTCFLAGS and LDFLAGS to
  12 KBUILD_HOSTLDFLAGS.
  13
  14 Also pass the cflags through to libbpf via EXTRA_CFLAGS to ensure that
  15 the host libbpf is built with flags consistent with resolve_btfids.
  16
  17 Signed-off-by: Connor O'Brien <connoro@google.com>
  18 Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
  19 Acked-by: Song Liu <songliubraving@fb.com>
  20 Link: https://lore.kernel.org/bpf/20220112002503.115968-1-connoro@google.com
  21 (cherry picked from commit 0e3a1c902ffb56e9fe4416f0cd382c97b09ecbf6)
  22 Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
  23 ---
  24  tools/bpf/resolve_btfids/Makefile | 6 ++++--
  25  1 file changed, 4 insertions(+), 2 deletions(-)
  26
  27 --- a/tools/bpf/resolve_btfids/Makefile
  28 +++ b/tools/bpf/resolve_btfids/Makefile
  29 @@ -23,6 +23,8 @@ CC       = $(HOSTCC)
  30  LD       = $(HOSTLD)
  31  ARCH     = $(HOSTARCH)
  32  RM      ?= rm
  33 +CFLAGS  := $(KBUILD_HOSTCFLAGS)
  34 +LDFLAGS := $(KBUILD_HOSTLDFLAGS)
  35
  36  OUTPUT ?= $(srctree)/tools/bpf/resolve_btfids/
  37
  38 @@ -45,9 +47,9 @@ $(SUBCMDOBJ): fixdep FORCE | $(OUTPUT)/l
  39         $(Q)$(MAKE) -C $(SUBCMD_SRC) OUTPUT=$(abspath $(dir $@))/ $(abspath $@)
  40
  41  $(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(OUTPUT)/libbpf
  42 -       $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC)  OUTPUT=$(abspath $(dir $@))/ $(abspath $@)
  43 +       $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC)  OUTPUT=$(abspath $(dir $@))/ EXTRA_CFLAGS="$(CFLAGS)" $(abspath $@)
  44
  45 -CFLAGS := -g \
  46 +CFLAGS += -g \
  47            -I$(srctree)/tools/include \
  48            -I$(srctree)/tools/include/uapi \
  49            -I$(LIBBPF_SRC) \