linux-kernel - Re: why scripts/link-vmlinux.sh has a final build of init/

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Date:   Wed, 14 Feb 2018 20:31:29 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Cao jin <caoj.fnst@...fujitsu.com>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: why scripts/link-vmlinux.sh has a final build of init/

2018-02-13 16:08 GMT+09:00 Cao jin <caoj.fnst@...fujitsu.com>:

> BTW, I still have 2 questions.
>
> 1. In final build, why need
>
>    GCC_PLUGINS_CFLAGS="${GCC_PLUGINS_CFLAGS}"
>
> Doesn't GCC_PLUGINS_CFLAGS already exist in the environment?
>
> I also tested the Randomizing Structure Layout plugin with this patch,
> the plugin seems works in my test.


I have not tested, but GCC_PLUGINS_CFLAGS="${GCC_PLUGINS_CFLAGS}"
is probably unnecessary.



> 2. scripts/link-vmlinux.sh seems just handle only one argument: clean.
> So why shouldn't it be:


To detect the change of $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
because link-vmlinux.sh depends on them.



> diff --git a/Makefile b/Makefile
> index ccd981892ef2..21d93b545381 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -998,7 +998,7 @@ ARCH_POSTLINK := $(wildcard
> $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
>
>  # Final link of vmlinux with optional arch pass after final link
>  cmd_link-vmlinux =                                                 \
> -       $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
> +       $(CONFIG_SHELL) $<;                                         \
>         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
>
>  vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE



-- 
Best Regards
Masahiro Yamada