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From:   Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
Date:   Fri, 11 Oct 2019 10:55:42 -0300
To:     Jiri Olsa <jolsa@kernel.org>
Cc:     Andi Kleen <ak@linux.intel.com>,
        lkml <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Michael Petlan <mpetlan@redhat.com>
Subject: Re: [PATCH] perf tools: Propagate CFLAGS to libperf
Message-ID: <20191011135542.GA32176@kernel.org>
References: <20191011122155.15738-1-jolsa@kernel.org>
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Em Fri, Oct 11, 2019 at 02:21:55PM +0200, Jiri Olsa escreveu:
> Andi reported that 'make DEBUG=1' does not propagate
> to the libbperf code. It's true also for the other
> flags. Changing the code to propagate the global
> build flags to libperf compilation.

Thanks, applied.

- Arnaldo
 
> Reported-by: Andi Kleen <ak@linux.intel.com>
> Link: http://lkml.kernel.org/n/tip-sgq5yeyvitp655s2iq3e75ls@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
>  tools/perf/Makefile.config | 28 +++++++++++++++-------------
>  tools/perf/Makefile.perf   |  2 +-
>  tools/perf/lib/core.c      |  3 ++-
>  3 files changed, 18 insertions(+), 15 deletions(-)
> 
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index 46f7fba2306c..063202c53b64 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -188,7 +188,7 @@ endif
>  
>  # Treat warnings as errors unless directed not to
>  ifneq ($(WERROR),0)
> -  CFLAGS += -Werror
> +  CORE_CFLAGS += -Werror
>    CXXFLAGS += -Werror
>  endif
>  
> @@ -198,9 +198,9 @@ endif
>  
>  ifeq ($(DEBUG),0)
>  ifeq ($(CC_NO_CLANG), 0)
> -  CFLAGS += -O3
> +  CORE_CFLAGS += -O3
>  else
> -  CFLAGS += -O6
> +  CORE_CFLAGS += -O6
>  endif
>  endif
>  
> @@ -245,12 +245,12 @@ FEATURE_CHECK_LDFLAGS-libaio = -lrt
>  
>  FEATURE_CHECK_LDFLAGS-disassembler-four-args = -lbfd -lopcodes -ldl
>  
> -CFLAGS += -fno-omit-frame-pointer
> -CFLAGS += -ggdb3
> -CFLAGS += -funwind-tables
> -CFLAGS += -Wall
> -CFLAGS += -Wextra
> -CFLAGS += -std=gnu99
> +CORE_CFLAGS += -fno-omit-frame-pointer
> +CORE_CFLAGS += -ggdb3
> +CORE_CFLAGS += -funwind-tables
> +CORE_CFLAGS += -Wall
> +CORE_CFLAGS += -Wextra
> +CORE_CFLAGS += -std=gnu99
>  
>  CXXFLAGS += -std=gnu++11 -fno-exceptions -fno-rtti
>  CXXFLAGS += -Wall
> @@ -272,12 +272,12 @@ include $(FEATURES_DUMP)
>  endif
>  
>  ifeq ($(feature-stackprotector-all), 1)
> -  CFLAGS += -fstack-protector-all
> +  CORE_CFLAGS += -fstack-protector-all
>  endif
>  
>  ifeq ($(DEBUG),0)
>    ifeq ($(feature-fortify-source), 1)
> -    CFLAGS += -D_FORTIFY_SOURCE=2
> +    CORE_CFLAGS += -D_FORTIFY_SOURCE=2
>    endif
>  endif
>  
> @@ -301,10 +301,12 @@ INC_FLAGS += -I$(src-perf)/util
>  INC_FLAGS += -I$(src-perf)
>  INC_FLAGS += -I$(srctree)/tools/lib/
>  
> -CFLAGS   += $(INC_FLAGS)
> +CORE_CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
> +
> +CFLAGS   += $(CORE_CFLAGS) $(INC_FLAGS)
>  CXXFLAGS += $(INC_FLAGS)
>  
> -CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
> +LIBPERF_CFLAGS := $(CORE_CFLAGS) $(EXTRA_CFLAGS)
>  
>  ifeq ($(feature-sync-compare-and-swap), 1)
>    CFLAGS += -DHAVE_SYNC_COMPARE_AND_SWAP_SUPPORT
> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index 45c14dc24f4b..a099a8a89447 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -769,7 +769,7 @@ $(LIBBPF)-clean:
>  	$(Q)$(MAKE) -C $(BPF_DIR) O=$(OUTPUT) clean >/dev/null
>  
>  $(LIBPERF): FORCE
> -	$(Q)$(MAKE) -C $(LIBPERF_DIR) O=$(OUTPUT) $(OUTPUT)libperf.a
> +	$(Q)$(MAKE) -C $(LIBPERF_DIR) EXTRA_CFLAGS="$(LIBPERF_CFLAGS)" O=$(OUTPUT) $(OUTPUT)libperf.a
>  
>  $(LIBPERF)-clean:
>  	$(call QUIET_CLEAN, libperf)
> diff --git a/tools/perf/lib/core.c b/tools/perf/lib/core.c
> index d0b9ae422b9f..58fc894b76c5 100644
> --- a/tools/perf/lib/core.c
> +++ b/tools/perf/lib/core.c
> @@ -5,11 +5,12 @@
>  #include <stdio.h>
>  #include <stdarg.h>
>  #include <unistd.h>
> +#include <linux/compiler.h>
>  #include <perf/core.h>
>  #include <internal/lib.h>
>  #include "internal.h"
>  
> -static int __base_pr(enum libperf_print_level level, const char *format,
> +static int __base_pr(enum libperf_print_level level __maybe_unused, const char *format,
>  		     va_list args)
>  {
>  	return vfprintf(stderr, format, args);
> -- 
> 2.21.0

-- 

- Arnaldo