linux-kernel - Re: [PATCH v2 3/3] objtool: use global host flags for compilation

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Date:   Tue, 27 Feb 2018 11:49:32 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Robin Jarry <robin.jarry@...nd.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v2 3/3] objtool: use global host flags for compilation

On Mon, Feb 26, 2018 at 07:41:48PM +0100, Robin Jarry wrote:
> When libelf headers and libs are not found and CONFIG_UNWINDER_ORC is
> selected, there is a make error introduced by
> commit 3dd40cb320fe ("objtool: Upgrade libelf-devel warning to error for
> CONFIG_ORC_UNWINDER").
> 
> Host headers and libs may be in a non-standard location and the check is
> performed without host flags. Make sure to use host flags for the check
> and for building objtool. Remove duplicate flags.
> 
> Fixes: 3b27a0c85d70 ("objtool: Detect and warn if libelf is missing and don't break the build")
> Signed-off-by: Robin Jarry <robin.jarry@...nd.com>
> Cc: Josh Poimboeuf <jpoimboe@...hat.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> ---
>  Makefile               | 2 +-
>  tools/objtool/Makefile | 4 ++--
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index f7c543cebfc6..c9dc35fe0e48 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -955,7 +955,7 @@ export mod_sign_cmd
>  
>  ifdef CONFIG_STACK_VALIDATION
>    has_libelf := $(call try-run,\
> -		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
> +	echo "int main() {}" | $(HOSTCC) $(HOSTLDFLAGS) -xc -o /dev/null -lelf -,1,0)

This should probably also have HOSTCFLAGS, since the objtool makefile
uses it as well.

-- 
Josh