linux-kernel - Re: [PATCH v2 7/7] kbuild: link vmlinux only once for CONFIG_TRIM_UNUSED

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Message-ID: <nycvar.YSQ.7.76.1803152229070.28583@knanqh.ubzr>
Date:   Thu, 15 Mar 2018 22:32:22 -0400 (EDT)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
cc:     linux-kbuild@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 7/7] kbuild: link vmlinux only once for
 CONFIG_TRIM_UNUSED_KSYMS

On Fri, 16 Mar 2018, Masahiro Yamada wrote:

> +# Recurse until adjust_autoksyms.sh is satisfied
> +PHONY += autoksyms_recursive
> +autoksyms_recursive: $(vmlinux-deps)
> +	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh  \
>  	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
> -endif
>  
>  # For the kernel to actually contain only the needed exported symbols,
>  # we have to build modules as well to determine what those symbols are.
> @@ -1034,7 +1024,13 @@ cmd_link-vmlinux =                                                 \
>  	$(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
>  	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
>  
> -vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
> +vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE

Don't you have to make the autoksyms_recursive dependency conditional on 
CONFIG_TRIM_UNUSED_KSYMS?


Nicolas