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From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Robin Jarry <robin.jarry@6wind.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>,
	Michal Marek <michal.lkml@markovi.net>,
	linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 0/3] kbuild: fix host progs build with libs in non standard locations
Date: Tue, 27 Feb 2018 11:45:18 -0600	[thread overview]
Message-ID: <20180227174518.qzw6eqmuyggcvjl6@treble> (raw)
In-Reply-To: <cover.1519668832.git.robin.jarry@6wind.com>

On Mon, Feb 26, 2018 at 07:41:45PM +0100, Robin Jarry wrote:
> This patchset allows to build host programs that depend on external libs
> installed in non standard locations (i.e. not in /usr/include, /usr/lib,
> etc.).  For now, the only way is to force HOSTCC to include both the
> path to the host compiler and the build flags.
> 
> I have encountered this issue when building linux into the buildroot
> framework. host-* versions of libs may be compiled and installed in a
> host staging dir removing the need to install them on the build system.
> 
> I'm not really satisfied with the new HOST_{C,LD}FLAGS variables.  They
> are too similar to HOST{C,LD}FLAGS and I find them confusing.  However,
> HOST_EXTRA*FLAGS are already reserved for local use in makefiles (see
> Documentation/kbuild/makefiles.txt).  And I didn't want to have even
> longer USER_HOST_*FLAGS.  If someone has a better proposition, I'll
> happily make a v3.

In Documentation/kbuild/kbuild.txt, we have the following environment
variables:

  KCFLAGS
  --------------------------------------------------
  Additional options to the C compiler (for built-in and modules).
  
  CFLAGS_KERNEL
  --------------------------------------------------
  Additional options for $(CC) when used to compile
  code that is compiled as built-in.
  
  CFLAGS_MODULE
  --------------------------------------------------
  Additional module specific options to use for $(CC).
  
  LDFLAGS_MODULE
  --------------------------------------------------
  Additional options used for $(LD) when linking modules.
  
  LDFLAGS_vmlinux
  --------------------------------------------------
  Additional options passed to final link of vmlinux.

So instead of

  HOST_CFLAGS
  HOST_LDFLAGS

maybe it would be more consistent to call them

  CFLAGS_HOST
  LDFLAGS_HOST

?

Also, the new environment variables should be documented in the above
file.

-- 
Josh

  parent reply	other threads:[~2018-02-27 17:45 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-23 14:22 [PATCH 0/2] objtool: fix libelf detection in non-standard locations Robin Jarry
2018-02-23 14:22 ` [PATCH 1/2] kbuild: introduce HOST_EXTRALDFLAGS Robin Jarry
2018-02-23 14:22 ` [PATCH 2/2] objtool: use host flags to detect if libelf is missing Robin Jarry
2018-02-23 15:37   ` Josh Poimboeuf
2018-02-23 16:22     ` Robin Jarry
2018-02-23 16:34       ` Josh Poimboeuf
2018-02-26 18:41 ` [PATCH v2 0/3] kbuild: fix host progs build with libs in non standard locations Robin Jarry
2018-02-26 18:41   ` [PATCH v2 1/3] kbuild: introduce HOST_{C,LD}FLAGS Robin Jarry
2018-02-26 18:41   ` [PATCH v2 2/3] kbuild: use HOSTLDFLAGS for single .c executables Robin Jarry
2018-04-05 14:23     ` Masahiro Yamada
2018-02-26 18:41   ` [PATCH v2 3/3] objtool: use global host flags for compilation Robin Jarry
2018-02-27 17:49     ` Josh Poimboeuf
2018-02-27 20:55       ` Robin Jarry
2018-02-27 21:41         ` Josh Poimboeuf
2018-02-27 17:45   ` Josh Poimboeuf [this message]
2018-02-27 20:52     ` [PATCH v2 0/3] kbuild: fix host progs build with libs in non standard locations Robin Jarry
2018-02-27 21:38       ` Josh Poimboeuf
2018-02-28  0:23         ` Randy Dunlap
2018-02-28 10:22     ` Masahiro Yamada
2018-02-28 17:24       ` Robin Jarry

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