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From: Nicolas Pitre <nicolas.pitre@linaro.org>
To: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
Jarod Wilson <jarod@redhat.com>,
Prarit Bhargava <prarit@redhat.com>,
Michal Marek <michal.lkml@markovi.net>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 7/7] kbuild: link vmlinux just once for CONFIG_TRIM_UNUSED_KSYMS
Date: Thu, 15 Mar 2018 14:50:02 -0400 (EDT) [thread overview]
Message-ID: <nycvar.YSQ.7.76.1803151434270.28583@knanqh.ubzr> (raw)
In-Reply-To: <CAK7LNATANL6Lfa6=05g9fCfj0ZLNHu_XnPEfurrOBQ8YXqUc4w@mail.gmail.com>
On Thu, 15 Mar 2018, Masahiro Yamada wrote:
> I am not familiar with Make internal, but
> I can test it with simple code.
>
>
> [Test Makefile]
> A: B
> cp B A
> echo $?
>
> B: C
> cp C B
> touch A
>
> [Result]
> $ rm -rf A B C
> $ touch C
> $ make
> cp C B
> touch A
> cp B A
> echo B
> B
>
>
> In the recipe of 'B', 'A' is touched,
> so the dependency 'A: B' has already been met
> before the recipe of 'A' is executed,
> but Make does not notice that fact,
> then tries to update 'A'.
>
>
> The situation is the same.
> vmlinux has been updated in the recursed sub-make,
> but it is not noticed.
OK, I agree.
Nicolas
prev parent reply other threads:[~2018-03-15 18:50 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-14 16:44 [PATCH 0/7] kbuild: various fix, clean-up, improvements of CONFIG_TRIM_UNUSED_KSYMS Masahiro Yamada
2018-03-14 16:44 ` [PATCH 1/7] kbuild: clear LDFLAGS in the top Makefile Masahiro Yamada
2018-03-14 16:44 ` [PATCH 2/7] kbuild: touch autoksyms.h when it is really missing Masahiro Yamada
2018-03-14 17:26 ` Nicolas Pitre
2018-03-15 6:26 ` Masahiro Yamada
2018-03-14 16:44 ` [PATCH 3/7] kbuild: move 'scripts' target below Masahiro Yamada
2018-03-16 7:13 ` kbuild test robot
2018-03-16 7:20 ` Masahiro Yamada
2018-03-14 16:44 ` [PATCH 4/7] kbuild: restore touching autoksyms.h to the top Makefile Masahiro Yamada
2018-03-14 17:52 ` Nicolas Pitre
2018-03-14 16:44 ` [PATCH 5/7] kbuild: hide CONFIG_TRIM_UNUSED_KSYMS code from external module building Masahiro Yamada
2018-03-14 18:32 ` Nicolas Pitre
2018-03-15 6:36 ` Masahiro Yamada
2018-03-15 18:30 ` Nicolas Pitre
2018-03-14 16:44 ` [PATCH 6/7] kbuild: move include/config/ksym/* to include/ksym/* Masahiro Yamada
2018-03-14 18:47 ` Nicolas Pitre
2018-03-15 10:04 ` Masahiro Yamada
2018-03-15 11:01 ` Masahiro Yamada
2018-03-15 18:59 ` Nicolas Pitre
2018-03-14 16:44 ` [PATCH 7/7] kbuild: link vmlinux just once for CONFIG_TRIM_UNUSED_KSYMS Masahiro Yamada
2018-03-14 19:06 ` Nicolas Pitre
2018-03-15 8:00 ` Masahiro Yamada
2018-03-15 18:50 ` Nicolas Pitre [this message]
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