On Fri, Sep 18, 2015 at 04:23:34PM -0300, Arnaldo Carvalho de Melo wrote:
> Hi Jiri, Ingo,
>
> While trying to figure out why the bpf feature test is always
> triggering the display of the "Auto-detecting system features" I noticed
> this pattern:
>
> [acme@felicio linux]$ egrep '^define|eval' tools/build/Makefile.feature
> feature_check = $(eval $(feature_check_code))
> define feature_check_code
> feature_set = $(eval $(feature_set_code))
> define feature_set_code
> set_test_all_flags = $(eval $(set_test_all_flags_code))
> define set_test_all_flags_code
> feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
> define feature_print_status_code
> feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
> define feature_print_text_code
> feature_display_check = $(eval $(feature_check_code))
> define feature_display_check_code
> [acme@felicio linux]$
>
>
> In all but one case the eval matches the following define, except for the last
> one, don't we need the following patch?
>
> $ git diff tools/build/Makefile.feature
> diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
> index 0caeaf2cae5f..072ec879b84f 100644
> --- a/tools/build/Makefile.feature
> +++ b/tools/build/Makefile.feature
> @@ -142,7 +142,7 @@ ifneq ("$(FEATURE_DUMP)","$(FEATURE_DUMP_FILE)")
> feature_display := 1
> endif
>
> -feature_display_check = $(eval $(feature_check_code))
> +feature_display_check = $(eval $(feature_check_display_code))
> define feature_display_check_code
> ifneq ($(feature-$(1)), 1)
> feature_display := 1
ouch, that is a bug.. nice catch!
thanks,
jirka
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