linux-kernel - Re: [PATCH 3/3] powerpc: enable support for GCC plugins

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Message-Id: <20161206222520.7fb37896488eff1b299eb3db@gmail.com>
Date:   Tue, 6 Dec 2016 22:25:20 +0100
From:   Emese Revfy <re.emese@...il.com>
To:     Andrew Donnellan <andrew.donnellan@....ibm.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, kernel-hardening@...ts.openwall.com,
        keescook@...omium.org, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org, pageexec@...email.hu,
        spender@...ecurity.net, mmarek@...e.com
Subject: Re: [PATCH 3/3] powerpc: enable support for GCC plugins

On Tue,  6 Dec 2016 17:28:00 +1100
Andrew Donnellan <andrew.donnellan@....ibm.com> wrote:

> +      # Various gccs between 4.5 and 5.1 have bugs on powerpc due to missing
> +      # header files. gcc <= 4.6 doesn't work at all, gccs from 4.8 to 5.1 have
> +      # issues with 64-bit targets.
> +      ifeq ($(ARCH),powerpc)
> +        ifeq ($(call cc-ifversion, -le, 0501, y), y)
> +	  @echo "Cannot use CONFIG_GCC_PLUGINS: plugin support on gcc <= 5.1 is buggy on powerpc, please upgrade to gcc 5.2 or newer" >&2 && exit 1
> +        endif
> +      endif

Hi,

What are these missing headers? Because if they aren't necessary then they can
be removed from gcc-common.h. There were missing headers on arm/arm64 and these
archs are supported. I think this version check is unnecessary because
gcc-plugin.sh also checks the missing headers.

What is the problem on gcc-4.5/gcc-4.6?

-- 
Emese