linux-kernel - Re: [PATCH] perf: Don't hardcode host include path for libslang

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Date:   Sun, 16 Jun 2019 11:46:05 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: Re: [PATCH] perf: Don't hardcode host include path for libslang

On Fri, Jun 14, 2019 at 11:39:47AM -0700, Florian Fainelli wrote:
> Hardcoding /usr/include/slang is fundamentally incompatible with cross
> compilation and will lead to the inability for a cross-compiled
> environment to properly detect whether slang is available or not.
> 
> If /usr/include/slang is necessary that is a distribution specific
> knowledge that could be solved with either a standard pkg-config .pc
> file (which slang has) or simply overriding CFLAGS accordingly, but the
> default perf Makefile should be clean of all of that.

fedora 30 is ok with this, I guess acme's distro test will
tell us about the rest ;-)

jirka

> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  tools/build/feature/Makefile | 2 +-
>  tools/perf/Makefile.config   | 1 -
>  2 files changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
> index 4b8244ee65ce..f9432d21eff9 100644
> --- a/tools/build/feature/Makefile
> +++ b/tools/build/feature/Makefile
> @@ -181,7 +181,7 @@ $(OUTPUT)test-libaudit.bin:
>  	$(BUILD) -laudit
>  
>  $(OUTPUT)test-libslang.bin:
> -	$(BUILD) -I/usr/include/slang -lslang
> +	$(BUILD) -lslang
>  
>  $(OUTPUT)test-libcrypto.bin:
>  	$(BUILD) -lcrypto
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index 85fbcd265351..b11134fdf59f 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -641,7 +641,6 @@ ifndef NO_SLANG
>      NO_SLANG := 1
>    else
>      # Fedora has /usr/include/slang/slang.h, but ubuntu /usr/include/slang.h
> -    CFLAGS += -I/usr/include/slang
>      CFLAGS += -DHAVE_SLANG_SUPPORT
>      EXTLIBS += -lslang
>      $(call detected,CONFIG_SLANG)
> -- 
> 2.17.1
>