5c0c385226
When we build our host programs, and they depend on a host library we
also build, we want to ensure that program actually uses that library at
runtime, and not the one from the system.
We currently ensure that in two ways:
- we add a RPATH tag that points to our host library directory,
- we export LD_LIBRARY_PATH to point to that same directory.
With these two in place, we're pretty much confident that our host
libraries will be used by our host programs.
However, it turns our that not all the host programs we build end up
with an RPATH tag:
- some packages do not use our $(HOST_LDFLAGS)
- some packages' build system are oblivious to those LDFLAGS
In this case, there are two situations:
- the program is not linked to one of our host libraries: it in fact
does not need an RPATH tag [0]
- the program actually uses one of our host libraries: in that case it
should have had an RPATH tag pointing to the host directory.
For libraries, they only need an RPATH if they depend on another library
that is not installed in the standard library path. However, any system
library will already be in the standard library path, and any library we
install ourselves is in $(HOST_DIR)/usr/lib so already in RPATH.
We add a new support script that checks that all ELF executables have
a proper DT_RPATH (or DT_RUNPATH) tag when they link to our host
libraries, and reports those file that are missing an RPATH. If a file
missing an RPATH is an executable, the script aborts; if only libraries
are are missing an RPATH, the script does not abort.
[0] Except if it were to dlopen() it, of course, but the only program
I'm aware of that does that is openssl, and it has a correct RPATH tag.
[Peter: reworded as suggested by Arnout, fix HOT_DIR typo in comment]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Peter Korsgaard <jacmet@uclibc.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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||
|---|---|---|
| .. | ||
| apply-patches.sh | ||
| build-ext3-img | ||
| check-host-rpath | ||
| check-kernel-headers.sh | ||
| eclipse-register-toolchain | ||
| expunge-gconv-modules | ||
| gen-manual-lists.py | ||
| graph-build-time | ||
| graph-depends | ||
| kconfiglib.py | ||
| mkmakefile | ||
| mkusers | ||
| pkg-stats | ||
| readme.kconfiglib | ||
| scancpan | ||
| setlocalversion | ||
| size-stats | ||
| xorg-release | ||
Readme ====== Kconfiglib ---------- This python module, developped by Ulf Magnusson and released under the ISC license, is fetched from: https://github.com/ulfalizer/Kconfiglib commit: a95f477eafc0b6708c3ce671fce7302ecec4f789 Kconfiglib license ~~~~~~~~~~~~~~~~~~ License (ISC) Copyright (c) 2011-2013, Ulf Magnusson <ulfalizer@gmail.com> Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.