linux-kernel - Re: [PATCH] scripts/dtc: use pkg-config to include <yaml.h> in non-standard path

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Message-ID: <20200608191545.GA3346390@bogus>
Date:   Mon, 8 Jun 2020 13:15:45 -0600
From:   Rob Herring <robh@...nel.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Frank Rowand <frowand.list@...il.com>
Subject: Re: [PATCH] scripts/dtc: use pkg-config to include <yaml.h> in
 non-standard path

On Tue, May 05, 2020 at 07:03:19PM +0900, Masahiro Yamada wrote:
> Commit 067c650c456e ("dtc: Use pkg-config to locate libyaml") added
> 'pkg-config --libs' to link libyaml installed in a non-standard
> location.
> 
> yamltree.c includes <yaml.h>, but that commit did not add the search
> path for <yaml.h>. If /usr/include/yaml.h does not exist, it fails to
> build. A user can explicitly pass HOSTCFLAGS to work around it, but
> the policy is not consistent.
> 
> There are two ways to deal with libraries in a non-default location.
> 
> [1] Use HOSTCFLAGS and HOSTLDFLAGS for additional search paths for
>     headers and libraries.
>     They are documented in Documentation/kbuild/kbuild.rst
> 
>     $ make HOSTCFLAGS='-I <prefix>/include' HOSTLDFLAGS='-L <prefix>/lib'
> 
> [2] Use pkg-config
> 
>     'pkg-config --cflags' for querying the header search path
>     'pkg-config --libs'   for querying the lib and its path
> 
> If we go with pkg-config, use [2] consistently. Do not mix up
> [1] and [2].
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
>  scripts/dtc/Makefile | 3 +++
>  1 file changed, 3 insertions(+)

Sorry, missed this one. Now applied for 5.8.

Rob