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Message-Id: <20230117165326.3e693a12a45a1962ca0c40af@linux-foundation.org>
Date:   Tue, 17 Jan 2023 16:53:26 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     "Herton R. Krzesinski" <herton@...hat.com>
Cc:     linux-kernel@...r.kernel.org, vbabka@...e.cz, jforbes@...hat.com,
        dzickus@...hat.com, scweaver@...hat.com
Subject: Re: [PATCH] tools/vm: allow users to provide additional
 cflags/ldflags

On Mon, 16 Jan 2023 19:49:21 -0300 "Herton R. Krzesinski" <herton@...hat.com> wrote:

> Right now there is no way to provide additional cflags/ldflags when
> building tools/vm binaries. And using eg. make CFLAGS=<options> will
> override the CFLAGS being set in the Makefile, making the build fail
> since it requires the include of the ../lib dir (for libapi).
> 
> This change then allows you to specify:
> CFLAGS=<options> LDFLAGS=<options> make V=1 -C tools/vm
> 
> And the options will be correctly appended as can be seen from the
> make output.
> 
> ...
>
> --- a/tools/vm/Makefile
> +++ b/tools/vm/Makefile
> @@ -8,8 +8,8 @@ TARGETS=page-types slabinfo page_owner_sort
>  LIB_DIR = ../lib/api
>  LIBS = $(LIB_DIR)/libapi.a
>  
> -CFLAGS = -Wall -Wextra -I../lib/
> -LDFLAGS = $(LIBS)
> +CFLAGS += -Wall -Wextra -I../lib/
> +LDFLAGS += $(LIBS)
>  

I think EXTRA_CFLAGS is more conventional?

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