linux-kernel - Re: [PATCH v3 bpf-next 12/14] samples: bpf: makefile: provide C/CXX/LD flags to libbpf

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Date:   Tue, 17 Sep 2019 22:20:36 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Yonghong Song <yhs@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        john fastabend <john.fastabend@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        clang-built-linux@...glegroups.com,
        sergei.shtylyov@...entembedded.com
Subject: Re: [PATCH v3 bpf-next 12/14] samples: bpf: makefile: provide
 C/CXX/LD flags to libbpf

On Mon, Sep 16, 2019 at 3:58 AM Ivan Khoronzhuk
<ivan.khoronzhuk@...aro.org> wrote:
>
> In order to build libs using C/CXX/LD flags of target arch,
> provide them to libbpf make.
>
> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
> ---
>  samples/bpf/Makefile | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
> index 18ec22e7b444..133123d4c7d7 100644
> --- a/samples/bpf/Makefile
> +++ b/samples/bpf/Makefile
> @@ -182,8 +182,6 @@ ifdef CROSS_COMPILE
>  TPROGS_CFLAGS += -Wall
>  TPROGS_CFLAGS += -O2
>  TPROGS_CFLAGS += -fomit-frame-pointer
> -TPROGS_CFLAGS += -Wmissing-prototypes
> -TPROGS_CFLAGS += -Wstrict-prototypes
>  else
>  TPROGS_LDLIBS := $(KBUILD_HOSTLDLIBS)
>  TPROGS_CFLAGS += $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS)
> @@ -196,6 +194,14 @@ TPROGS_CFLAGS += -I$(srctree)/tools/lib/
>  TPROGS_CFLAGS += -I$(srctree)/tools/include
>  TPROGS_CFLAGS += -I$(srctree)/tools/perf
>
> +EXTRA_CXXFLAGS := $(TPROGS_CFLAGS)
> +
> +# options not valid for C++
> +ifdef CROSS_COMPILE
> +$(TPROGS_CFLAGS) += -Wmissing-prototypes
> +$(TPROGS_CFLAGS) += -Wstrict-prototypes
> +endif
> +

ugh, let's really get rid of dependency on C++ compiler, as suggested
for previous patch.


>  TPROGCFLAGS_bpf_load.o += -Wno-unused-variable
>
>  TPROGS_LDLIBS                  += $(LIBBPF) -lelf
> @@ -257,7 +263,9 @@ clean:
>
>  $(LIBBPF): FORCE
>  # Fix up variables inherited from Kbuild that tools/ build system won't like
> -       $(MAKE) -C $(dir $@) RM='rm -rf' LDFLAGS= srctree=$(BPF_SAMPLES_PATH)/../../ O=
> +       $(MAKE) -C $(dir $@) RM='rm -rf' EXTRA_CFLAGS="$(TPROGS_CFLAGS)" \
> +               EXTRA_CXXFLAGS="$(EXTRA_CXXFLAGS)" LDFLAGS=$(TPROGS_LDFLAGS) \
> +               srctree=$(BPF_SAMPLES_PATH)/../../ O=
>
>  $(obj)/syscall_nrs.h:  $(obj)/syscall_nrs.s FORCE
>         $(call filechk,offsets,__SYSCALL_NRS_H__)
> --
> 2.17.1
>