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From: Robin Jarry <>
To: Masahiro Yamada <>,
	Michal Marek <>
Subject: [PATCH v2 0/3] kbuild: fix host progs build with libs in non standard locations
Date: Mon, 26 Feb 2018 19:41:45 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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.

Comments are welcome.

Changes since v1:
 - Fix typos.
 - Do not use HOST_EXTRA*FLAGS. Add new user specifiable variables.
 - Pass HOSTLDFLAGS to build single .c programs.
 - Build objtool with host flags.

Robin Jarry (3):
  kbuild: introduce HOST_{C,LD}FLAGS
  kbuild: use HOSTLDFLAGS for single .c executables
  objtool: use global host flags for compilation

 Documentation/admin-guide/README.rst | 16 ++++++++++++++++
 Makefile                             |  9 +++++----
 scripts/                |  2 +-
 tools/objtool/Makefile               |  4 ++--
 4 files changed, 24 insertions(+), 7 deletions(-)


  parent reply	other threads:[~2018-02-26 18:42 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 ` Robin Jarry [this message]
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   ` [PATCH v2 0/3] kbuild: fix host progs build with libs in non standard locations Josh Poimboeuf
2018-02-27 20:52     ` 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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