linux-kernel - Re: [PATCH v1] tools/resolve_btfids: Install subcmd headers

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Message-ID: <Y8Uzet0cNtDo8kHe@krava>
Date:   Mon, 16 Jan 2023 12:22:34 +0100
From:   Jiri Olsa <olsajiri@...il.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>,
        Connor OBrien <connoro@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] tools/resolve_btfids: Install subcmd headers

On Wed, Jan 11, 2023 at 04:40:24PM -0800, Ian Rogers wrote:
> Previously tools/lib/subcmd was added to the include path, switch to
> installing the headers and then including from that directory. This
> avoids dependencies on headers internal to tools/lib/subcmd. Add the
> missing subcmd directory to the affected #include.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/bpf/resolve_btfids/Makefile | 19 ++++++++++++++-----
>  tools/bpf/resolve_btfids/main.c   |  2 +-
>  2 files changed, 15 insertions(+), 6 deletions(-)

this depends on changes that went to Arnaldo's tree right?
I can't apply this on bpf-next/master

> 
> diff --git a/tools/bpf/resolve_btfids/Makefile b/tools/bpf/resolve_btfids/Makefile
> index 19a3112e271a..de7d29cf43d6 100644
> --- a/tools/bpf/resolve_btfids/Makefile
> +++ b/tools/bpf/resolve_btfids/Makefile
> @@ -35,21 +35,29 @@ SUBCMD_SRC := $(srctree)/tools/lib/subcmd/
>  BPFOBJ     := $(OUTPUT)/libbpf/libbpf.a
>  LIBBPF_OUT := $(abspath $(dir $(BPFOBJ)))/
>  SUBCMDOBJ  := $(OUTPUT)/libsubcmd/libsubcmd.a
> +SUBCMD_OUT := $(abspath $(dir $(SUBCMDOBJ)))/
>  
>  LIBBPF_DESTDIR := $(LIBBPF_OUT)
>  LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)include
>  
> +SUBCMD_DESTDIR := $(SUBCMD_OUT)
> +SUBCMD_INCLUDE := $(SUBCMD_DESTDIR)include
> +
>  BINARY     := $(OUTPUT)/resolve_btfids
>  BINARY_IN  := $(BINARY)-in.o
>  
>  all: $(BINARY)
>  
> +prepare: $(SUBCMDOBJ)

do we need special target for that? we already have BPFOBJ dependency
placed in the BINARY_IN as prereq

why not place both as BINARY_IN prereq, or is there some other reason
for new 'prepare' target?

jirka

> +
>  $(OUTPUT) $(OUTPUT)/libsubcmd $(LIBBPF_OUT):
>  	$(call msg,MKDIR,,$@)
>  	$(Q)mkdir -p $(@)
>  
>  $(SUBCMDOBJ): fixdep FORCE | $(OUTPUT)/libsubcmd
> -	$(Q)$(MAKE) -C $(SUBCMD_SRC) OUTPUT=$(abspath $(dir $@))/ $(abspath $@)
> +	$(Q)$(MAKE) -C $(SUBCMD_SRC) OUTPUT=$(SUBCMD_OUT) \
> +		    DESTDIR=$(SUBCMD_DESTDIR) prefix= \
> +		    $(abspath $@) install_headers
>  
>  $(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUT)
>  	$(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) OUTPUT=$(LIBBPF_OUT)    \
> @@ -60,14 +68,14 @@ CFLAGS += -g \
>            -I$(srctree)/tools/include \
>            -I$(srctree)/tools/include/uapi \
>            -I$(LIBBPF_INCLUDE) \
> -          -I$(SUBCMD_SRC)
> +          -I$(SUBCMD_INCLUDE)
>  
>  LIBS = -lelf -lz
>  
>  export srctree OUTPUT CFLAGS Q
>  include $(srctree)/tools/build/Makefile.include
>  
> -$(BINARY_IN): $(BPFOBJ) fixdep FORCE | $(OUTPUT)
> +$(BINARY_IN): $(BPFOBJ) fixdep FORCE prepare | $(OUTPUT)
>  	$(Q)$(MAKE) $(build)=resolve_btfids
>  
>  $(BINARY): $(BPFOBJ) $(SUBCMDOBJ) $(BINARY_IN)
> @@ -79,7 +87,8 @@ clean_objects := $(wildcard $(OUTPUT)/*.o                \
>                              $(OUTPUT)/.*.o.d             \
>                              $(LIBBPF_OUT)                \
>                              $(LIBBPF_DESTDIR)            \
> -                            $(OUTPUT)/libsubcmd          \
> +                            $(SUBCMD_OUT)                \
> +                            $(SUBCMD_DESTDIR)            \
>                              $(OUTPUT)/resolve_btfids)
>  
>  ifneq ($(clean_objects),)
> @@ -96,4 +105,4 @@ tags:
>  
>  FORCE:
>  
> -.PHONY: all FORCE clean tags
> +.PHONY: all FORCE clean tags prepare
> diff --git a/tools/bpf/resolve_btfids/main.c b/tools/bpf/resolve_btfids/main.c
> index 80cd7843c677..77058174082d 100644
> --- a/tools/bpf/resolve_btfids/main.c
> +++ b/tools/bpf/resolve_btfids/main.c
> @@ -75,7 +75,7 @@
>  #include <linux/err.h>
>  #include <bpf/btf.h>
>  #include <bpf/libbpf.h>
> -#include <parse-options.h>
> +#include <subcmd/parse-options.h>
>  
>  #define BTF_IDS_SECTION	".BTF_ids"
>  #define BTF_ID		"__BTF_ID__"
> -- 
> 2.39.0.314.g84b9a713c41-goog
>