git.openwrt.org Git - openwrt/staging/xback.git/blob

   1 From 7b00d4a90af1d7bff50833ffe1216cf59592353a Mon Sep 17 00:00:00 2001
   2 From: Andre Heider <a.heider@gmail.com>
   3 Date: Wed, 18 Jan 2023 22:42:28 +0100
   4 Subject: [PATCH] Add BPF_LDFLAGS to allow overwriting llc's -march argument
   5
   6 The argument to clang's -target isn't necessarily the same as to
   7 llc's -march.
   8
   9 Analogue to BPF_CFLAGS, introduce BPF_LDFLAGS to allow e.g.:
  10 BPF_TARGET="mipsel-linux-gnu" BPF_LDFLAGS="-march=bpfel -mcpu=v3"
  11
  12 Signed-off-by: Andre Heider <a.heider@gmail.com>
  13 ---
  14  configure           | 2 ++
  15  lib/common.mk       | 2 +-
  16  lib/libxdp/Makefile | 2 +-
  17  3 files changed, 4 insertions(+), 2 deletions(-)
  18
  19 --- a/configure
  20 +++ b/configure
  21 @@ -17,10 +17,12 @@ check_opts()
  22      : ${DYNAMIC_LIBXDP:=0}
  23      : ${MAX_DISPATCHER_ACTIONS:=10}
  24      : ${BPF_TARGET:=bpf}
  25 +    : ${BPF_LDFLAGS:=-march=$(BPF_TARGET)}
  26      echo "PRODUCTION:=${PRODUCTION}" >>$CONFIG
  27      echo "DYNAMIC_LIBXDP:=${DYNAMIC_LIBXDP}" >>$CONFIG
  28      echo "MAX_DISPATCHER_ACTIONS:=${MAX_DISPATCHER_ACTIONS}" >>$CONFIG
  29      echo "BPF_TARGET:=${BPF_TARGET}" >>$CONFIG
  30 +    echo "BPF_LDFLAGS:=${BPF_LDFLAGS}" >>$CONFIG
  31  }
  32
  33  find_tool()
  34 --- a/lib/common.mk
  35 +++ b/lib/common.mk
  36 @@ -115,7 +115,7 @@ $(XDP_OBJ): %.o: %.c $(KERN_USER_H) $(EX
  37             -Werror \
  38             $(BPF_CFLAGS) \
  39             -O2 -emit-llvm -c -g -o ${@:.o=.ll} $<
  40 -       $(QUIET_LLC)$(LLC) -march=$(BPF_TARGET) -filetype=obj -o $@ ${@:.o=.ll}
  41 +       $(QUIET_LLC)$(LLC) $(BPF_LDFLAGS) -filetype=obj -o $@ ${@:.o=.ll}
  42
  43  .PHONY: man
  44  ifeq ($(EMACS),)
  45 --- a/lib/libxdp/Makefile
  46 +++ b/lib/libxdp/Makefile
  47 @@ -146,7 +146,7 @@ $(XDP_OBJS): %.o: %.c $(BPF_HEADERS) $(L
  48             -Werror \
  49             $(BPF_CFLAGS) \
  50             -O2 -emit-llvm -c -g -o ${@:.o=.ll} $<
  51 -       $(QUIET_LLC)$(LLC) -march=$(BPF_TARGET) -filetype=obj -o $@ ${@:.o=.ll}
  52 +       $(QUIET_LLC)$(LLC) $(BPF_LDFLAGS) -filetype=obj -o $@ ${@:.o=.ll}
  53
  54  .PHONY: man
  55  ifeq ($(EMACS),)