Re: QT install and search paths

[Hartmut Goebel <h.goebel@crazy-compilers.com>]

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Am 25.08.2017 um 18:04 schrieb 宋文武:
> Here is a patch to adjust the directory layout of qtbase:

I tested this patch and building qtwayland failed:

cd
/tmp/guix-build-qtwayland-5.9.1.drv-0/qtwayland-opensource-src-5.9.1/tests/auto/client/client
./target_wrapper.sh  ./tst_client

The error message is (which is misleading, see below)

    This application failed to start because it could not find or load
    the Qt platform plugin "wayland"
    in "".

    Available platform plugins are: eglfs, linuxfb, minimal, minimalegl,
    offscreen, vnc, xcb, wayland-egl, wayland, wayland-xcomposite-egl,
    wayland-xcomposite-glx.

I searched the internet for this without any useful result (I did not
search too long, though). But there was a hint pointing to some missing
library. And indeed the strace output (see below, shortened) shows: the
platform plugin is found, but it requires libQt5WaylandClient.so.5 which
is searched without success. The file exists in
/tmp/guix-build-qtwayland-5.9.1.drv-0/qtwayland-opensource-src-5.9.1/lib/,
so it is part of qtwayland but not yet installed.

It is searched in several sub-directories of
/tmp/guix-build-…/qtwayland-opensource-src-5.9.1/plugins/platforms/../../../
(which is the /tmp/guix-build-qtwayland-5.9.1.drv-0 directory), but not
in …/lib. I did not find out how to

15562
open("/tmp/guix-build-qtwayland-5.9.1.drv-0/qtwayland-opensource-src-5.9.1/plugins/platforms/libqwayland-generic.so",
O_RDONLY|O_CLOEXEC) = 8
15562 read(8,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\24\0\0\0\0\0\0"...,
832) = 832
…
15562
open("/gnu/store/dnmbw43sl6yx82awzj8c0y4wcjz5z2kd-qtbase-5.9.1/lib/libQt5WaylandClient.so.5",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
15562
open("/tmp/guix-build-qtwayland-5.9.1.drv-0/qtwayland-opensource-src-5.9.1/plugins/platforms/../../../tls/x86_64/libQt5WaylandClient.so.5",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
15562
stat("/tmp/guix-build-qtwayland-5.9.1.drv-0/qtwayland-opensource-src-5.9.1/plugins/platforms/../../../tls/x86_64",
0x7ffc321fe710) = -1 ENOENT (No such file or directory)
15562
open("/tmp/guix-build-qtwayland-5.9.1.drv-0/qtwayland-opensource-src-5.9.1/plugins/platforms/../../../tls/libQt5WaylandClient.so.5",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
15562
stat("/tmp/guix-build-qtwayland-5.9.1.drv-0/qtwayland-opensource-src-5.9.1/plugins/platforms/../../../tls",
0x7ffc321fe710) = -1 ENOENT (No such file or directory)
15562
open("/tmp/guix-build-qtwayland-5.9.1.drv-0/qtwayland-opensource-src-5.9.1/plugins/platforms/../../../x86_64/libQt5WaylandClient.so.5",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
15562
stat("/tmp/guix-build-qtwayland-5.9.1.drv-0/qtwayland-opensource-src-5.9.1/plugins/platforms/../../../x86_64",
0x7ffc321fe710) = -1 ENOENT (No such file or directory)
15562
open("/tmp/guix-build-qtwayland-5.9.1.drv-0/qtwayland-opensource-src-5.9.1/plugins/platforms/../../../libQt5WaylandClient.so.5",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
15562
stat("/tmp/guix-build-qtwayland-5.9.1.drv-0/qtwayland-opensource-src-5.9.1/plugins/platforms/../../..",
{st_mode=S_IFDIR|0755, st_size=100, ...}) = 0
15562
open("/gnu/store/rmjlycdgiq8pfy5hfi42qhw3k7p6kdav-glibc-2.25/lib/libQt5WaylandClient.so.5",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)


Thinks I tried to solve this:
- setting |QT_QPA_PLATFORM_PLUGIN_PATH
- creating a file |qt.conf in the app folder

Things I did *not* try:
- reading http://www.tripleboot.org/?p=138 – to long :-)

Another insight:
- export QT_DEBUG_PLUGINS=1 makes qt report useful messages.
||

-- 
Regards
Hartmut Goebel

| Hartmut Goebel          | h.goebel@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |


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