[Buildroot] [PATCH] package/lzo: Set CMAKE_INSTALL_LIBDIR for host variant explicitly

Samuel Martin s.martin49 at gmail.com
Mon Sep 18 20:17:29 UTC 2017

Hi all,

On Thu, Sep 14, 2017 at 3:39 AM, Andrey Smirnov
<andrew.smirnov at gmail.com> wrote:
> On Wed, Sep 13, 2017 at 1:43 PM, Arnout Vandecappelle <arnout at mind.be> wrote:
>> On 13-09-17 20:55, Samuel Martin wrote:
>>> Hi Andrey,
>>> On Wed, Sep 13, 2017 at 7:37 PM, Andrey Smirnov
>>> <andrew.smirnov at gmail.com> wrote:
>>>> Building host-lzo on 64-bit Fedora 26 ends up with library files
>>>> installed into $(HOST_DIR)/lib64 instead of $(HOST_DIR)/lib where
>>>> other packages (at least host-mtd) depending on it would look for it
>>>> (resulting in build failures). Fix that by specifying the directory to
>>>> be lib/ explicitly.
>>  It would be good to find out why this happens. I don't see anything in
>> CMakeLists.txt that could explain this.
>>  Does this happen with the Buildroot-built host-cmake or only when you use the
>> system-installed one?
>>  I expect this will happen with all host-cmake packages... Could you check?
>>  Obviously, we need a more fundamental solution than this.
> Just finished digging more into this and it doesn't matter which CMake
> is being used (I tried both). As far as I can tell the reason for this
> behavior is the following code in CMake itself:
> https://github.com/Kitware/CMake/blob/master/Modules/GNUInstallDirs.cmake#L201
> I agree that this probably affects all "host-cmake" packages. I don't
> have any data to back that up (meaning I didn't try to investigate
> it), but I have a hunch that situation with "host-mtd" is exacerbated
> by the fact that it uses AC_CHECK_LIB instead of relying on
> PKG_CHECK_MODULES to find "lzo".

I confirm this behavior is to be expected from any cmake package (both
host and target since CMake guesses it from the target-tuple), but
this does not trigger any trouble in the staging or target trees
because of the symlinks created by the skeleton-init-common package

So far, lzo is the only host-cmake-package installing libs that are
used by others host-packages.

All others host-cmake-packages only install programs under
$(HOST_DIR)/bin, without installing any libs; except for
But host-mfgtools overrides its host install commands (installing it
in $(HOST_DIR)/lib), because no install rule is defined in its
CMakeLists.txt, so no install rule is generated in its Makefile.

BTW, the host-mfgtools program still has a valid RPATH pointing to
$(HOST_DIR)/lib, accordingly to $(HOST_LDFLAGS).

>>>> Signed-off-by: Andrey Smirnov <andrew.smirnov at gmail.com>
>>> Acked-by: Samuel Martin <s.martin49 at gmail.com>
>>  Nacked by me, we need a more fundamental fix.
>>>> ---
>>>> I suspect this might not be the best solution for this problem, but it
>>>> is a good starting point to discuss what might be and that's why I
>>>> submitted this patch anyway.
>>> Indeed the infra could certainly create the symlink $(HOST_DIR)/lib64
>>> -> lib (or  $(HOST_DIR)/lib32 -> lib).
>>  That could be a solution, but I don't like it very much... OTOH we do this for
>> staging/target already so why not for host.

Another solution could be setting -DCMAKE_INSTALL_LIBDIR=lib as part
of the options of the host configure command in the infra.
But I'm really not sure about this, especially how it would play if a
host cmake package wants to set it (e.g. to install plugins)... it
sounds even more fragile than the symlink approach...

> I have no opinion on the matter, so I am happy to modify the patch to
> do whatever you think is best.
> Thanks,
> Andrey Smirnov



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