linux-kernel - Re: [PATCH] perf tools: Enable warnings through HOSTCFLAGS

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Message-ID: <YYBXyGKfM2CAjghy@kernel.org>
Date:   Mon, 1 Nov 2021 18:10:32 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     John Garry <john.garry@...wei.com>
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, masahiroy@...nel.org, labbott@...hat.com,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        irogers@...gle.com
Subject: Re: [PATCH] perf tools: Enable warnings through HOSTCFLAGS

Em Sat, Oct 30, 2021 at 12:30:41AM +0800, John Garry escreveu:
> The tools build system uses KBUILD_HOSTCFLAGS symbol for obvious purposes.
> 
> However this is not set for anything under tools/
> 
> As such, host tools apps built have no compiler warnings enabled.
> 
> Declare HOSTCFLAGS for perf tools build, and also use that symbol in
> declaration of host_c_flags. HOSTCFLAGS comes from EXTRA_WARNINGS, which
> is independent of target platform/arch warning flags.
> 
> Suggested-by: Jiri Olsa <jolsa@...hat.com>
> Signed-off-by: John Garry <john.garry@...wei.com>

Jiri, does this implements your suggestion?

- Arnaldo

> --
> Using HOSTCFLAGS, as opposed to KBUILD_HOSTCFLAGS, is going opposite
> direction to commit 96f14fe738b6 ("kbuild: Rename HOSTCFLAGS to
> KBUILD_HOSTCFLAGS"), so would like further opinion from Laura and
> Masahiro.
> 
> diff --git a/tools/build/Build.include b/tools/build/Build.include
> index 2cf3b1bde86e..c2a95ab47379 100644
> --- a/tools/build/Build.include
> +++ b/tools/build/Build.include
> @@ -99,7 +99,7 @@ cxx_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXX
>  ###
>  ## HOSTCC C flags
>  
> -host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(KBUILD_HOSTCFLAGS) -D"BUILD_STR(s)=\#s" $(HOSTCFLAGS_$(basetarget).o) $(HOSTCFLAGS_$(obj))
> +host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(HOSTCFLAGS) -D"BUILD_STR(s)=\#s" $(HOSTCFLAGS_$(basetarget).o) $(HOSTCFLAGS_$(obj))
>  
>  # output directory for tests below
>  TMPOUT = .tmp_$$$$
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index 4a9baed28f2e..9b95ba09657f 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -17,6 +17,7 @@ detected     = $(shell echo "$(1)=y"       >> $(OUTPUT).config-detected)
>  detected_var = $(shell echo "$(1)=$($(1))" >> $(OUTPUT).config-detected)
>  
>  CFLAGS := $(EXTRA_CFLAGS) $(filter-out -Wnested-externs,$(EXTRA_WARNINGS))
> +HOSTCFLAGS := $(filter-out -Wnested-externs,$(EXTRA_WARNINGS))
>  
>  include $(srctree)/tools/scripts/Makefile.arch
>  
> @@ -211,6 +212,7 @@ endif
>  ifneq ($(WERROR),0)
>    CORE_CFLAGS += -Werror
>    CXXFLAGS += -Werror
> +  HOSTCFLAGS += -Werror
>  endif
>  
>  ifndef DEBUG
> @@ -292,6 +294,9 @@ CXXFLAGS += -ggdb3
>  CXXFLAGS += -funwind-tables
>  CXXFLAGS += -Wno-strict-aliasing
>  
> +HOSTCFLAGS += -Wall
> +HOSTCFLAGS += -Wextra
> +
>  # Enforce a non-executable stack, as we may regress (again) in the future by
>  # adding assembler files missing the .GNU-stack linker note.
>  LDFLAGS += -Wl,-z,noexecstack
> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index a3966f290297..8ca656aa8b06 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -226,7 +226,7 @@ else
>  endif
>  
>  export srctree OUTPUT RM CC CXX LD AR CFLAGS CXXFLAGS V BISON FLEX AWK
> -export HOSTCC HOSTLD HOSTAR
> +export HOSTCC HOSTLD HOSTAR HOSTCFLAGS
>  
>  include $(srctree)/tools/build/Makefile.include
>  
> -- 
> 2.17.1

-- 

- Arnaldo