All,
Been looking for a discussion forum where I could search because this
had to have come up before. It appears lt_dlopen() uses straight
dlopen() for additional library loads instead of using itself and the
user search path. Admittedly this could be user error, but so far the
documentation doesn't point to that. I'm going by the doc found here:
https://www.gnu.org/software/libtool/manual/
RPATH isn't allowed in secured environments. The .conf file has been a
legacy Qt bug since 4.x and probably earlier. It is definitely still
there. They used to hack in an RPATH to get around the local build
problem. Actually they hacked it into the system installed builds too,
but that has all been fixed. I will eventually use SDL3 as the base for
this, completely removing the plugins.
The fork of Qt begat Copperspice begat LsCs is here
https://github.com/RolandHughes/ls-cs/tree/ls-cs-0.2.1
If people wish to look at source, the file in question is
ls-cs/src/core/plugin/qlibrary_unix.cpp. I'm currently only working in
Ubuntu 18.04 so the shell scripts for RPM and other platforms probably
are no longer correct.
In the code starting at 192 I insert the the prefixed library and plugin
paths gleaned from
developer@developer-u18-VirtualBox:~/github_projects/LsCs_local_release$
cat share/LsCs/lscs.conf
[Paths]
Prefix = /home/developer/github_projects/LsCs_local_release
Headers = include/LsCs
Libraries = lib/LsCs
Binaries = bin
Plugins = lib/LsCs/plugins
Data = share/LsCs
Translations = share/LsCs/translations
At line 264 I call lt_dlopen. (Sorry, I did not clean up all of the
dlopen and flags stuff yet. Trying to get this to work first.) Oh, the
lt_dlinit() call is at line 98 and lt_dlexit() is at 323.
For decades now Qt and the forks of it have had this tree structure.
developer@developer-u18-VirtualBox:~/github_projects/LsCs_local_release$
tree lib
lib
└── LsCs
├── cmake
│ ├── LsCsBinaryTargets.cmake
│ ├── LsCsBinaryTargets-debug.cmake
│ ├── LsCsConfig.cmake
│ ├── LsCsConfigVersion.cmake
│ ├── LsCsLibraryTargets.cmake
│ ├── LsCsLibraryTargets-debug.cmake
│ └── LsCsMacros.cmake
├── libLsCsCore.so -> libLsCsCore.so.0
├── libLsCsCore.so.0 -> libLsCsCore.so.0.2.1
├── libLsCsCore.so.0.2.1
├── libLsCsGui.so -> libLsCsGui.so.0
├── libLsCsGui.so.0 -> libLsCsGui.so.0.2.1
├── libLsCsGui.so.0.2.1
├── libLsCsMultimedia.so -> libLsCsMultimedia.so.0
├── libLsCsMultimedia.so.0 -> libLsCsMultimedia.so.0.2.1
├── libLsCsMultimedia.so.0.2.1
├── libLsCsNetwork.so -> libLsCsNetwork.so.0
├── libLsCsNetwork.so.0 -> libLsCsNetwork.so.0.2.1
├── libLsCsNetwork.so.0.2.1
├── libLsCsOpenGL.so -> libLsCsOpenGL.so.0
├── libLsCsOpenGL.so.0 -> libLsCsOpenGL.so.0.2.1
├── libLsCsOpenGL.so.0.2.1
├── libLsCsSql.so -> libLsCsSql.so.0
├── libLsCsSql.so.0 -> libLsCsSql.so.0.2.1
├── libLsCsSql.so.0.2.1
├── libLsCsSvg.so -> libLsCsSvg.so.0
├── libLsCsSvg.so.0 -> libLsCsSvg.so.0.2.1
├── libLsCsSvg.so.0.2.1
├── libLsCsXcbSupport.so -> libLsCsXcbSupport.so.0
├── libLsCsXcbSupport.so.0 -> libLsCsXcbSupport.so.0.2.1
├── libLsCsXcbSupport.so.0.2.1
├── libLsCsXmlPatterns.so -> libLsCsXmlPatterns.so.0
├── libLsCsXmlPatterns.so.0 -> libLsCsXmlPatterns.so.0.2.1
├── libLsCsXmlPatterns.so.0.2.1
├── libLsCsXml.so -> libLsCsXml.so.0
├── libLsCsXml.so.0 -> libLsCsXml.so.0.2.1
├── libLsCsXml.so.0.2.1
├── libltdl.a
├── libltdl.la
├── libltdl.so -> libltdl.so.7.3.3
├── libltdl.so.7 -> libltdl.so.7.3.3
├── libltdl.so.7.3.3
├── LsCsPrinterDriverCups.so
└── plugins
├── imageformats
│ └── LsCsImageFormatsSvg.so
├── mediaservices
│ ├── LsCsMultimedia_gst_audiodecoder.so
│ ├── LsCsMultimedia_gst_camerabin.so
│ └── LsCsMultimedia_gst_mediaplayer.so
├── platforms
│ └── LsCsGuiXcb.so
├── playlistformats
│ └── LsCsMultimedia_m3u.so
├── sqldrivers
│ ├── LsCsSqlMySql.so
│ ├── LsCsSqlOdbc.so
│ └── LsCsSqlPsql.so
└── xcbglintegrations
└── LsCsGuiXcb_Glx.so
so they either hack with RPATH or they use a "deployqt"-like script that
copies all of the object libraries and all of the plugins into a single
directory with the executable you wrote.
Even when you do the "script hack"
developer@developer-u18-VirtualBox:~/github_projects/LsCs_examples_install/gui-hello$
cat g.sh
#!/bin/bash
#
export
LD_LIBRARY_PATH="/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins:/home/developer/github_projects/LsCs_local_release/lib/LsCs"
export
LTDL_LIBRARY_PATH="/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins:/home/developer/github_projects/LsCs_local_release/lib/LsCs"
export
LT_LIBRARY_PATH="/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins:/home/developer/github_projects/LsCs_local_release/lib/LsCs"
./gui-hello
you still end up with a stack dump because it is using dlopen for all of
the dependencies, or at least it appears to be.
developer@developer-u18-VirtualBox:~/github_projects/LsCs_examples_install/gui-hello$
./g.sh
QSettings:
key: Paths/Binaries value: bin
key: Paths/Data value: share/LsCs
key: Paths/Headers value: include/LsCs
key: Paths/Libraries value: lib/LsCs
key: Paths/Plugins value: lib/LsCs/plugins
key: Paths/Prefix value:
/home/developer/github_projects/LsCs_local_release
key: Paths/Translations value: share/LsCs/translations
pluginKey: xcb
QFactoryLoader::setup() libDirs:
(/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/xcbglintegrations,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/xcbglintegrations/LsCsGuiXcb_Glx.so,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/sqldrivers,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/sqldrivers/LsCsSqlOdbc.so,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/sqldrivers/LsCsSqlMySql.so,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/sqldrivers/LsCsSqlPsql.so,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/mediaservices,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/mediaservices/LsCsMultimedia_gst_audiodecoder.so,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/mediaservices/LsCsMultimedia_gst_camerabin.so,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/mediaservices/LsCsMultimedia_gst_mediaplayer.so,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/playlistformats,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/playlistformats/LsCsMultimedia_m3u.so,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/imageformats,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/imageformats/LsCsImageFormatsSvg.so,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/platforms,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/platforms/LsCsGuiXcb.so,
/home/developer/github_projects/LsCs_examples_install/gui-hello,
/home/developer/github_projects/LsCs_local_release/lib/LsCs,
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins)
looking for:
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/platforms/LsCsGuiXcb.so
lscs_findLibrary() looking for:
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/platforms/LsCsGuiXcb.so
prefixStr: /home/developer/github_projects/LsCs_local_release
librariesStr: /home/developer/github_projects/LsCs_local_release/lib/LsCs
pluginsStr:
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins
search path after changes:
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins:/home/developer/github_projects/LsCs_local_release/lib/LsCs
search path:
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins:/home/developer/github_projects/LsCs_local_release/lib/LsCs
attempt:
/home/developer/github_projects/LsCs_local_release/lib/LsCs/plugins/platforms/LsCsGuiXcb.so
./g.sh: line 7: 29748 Segmentation fault (core dumped) ./gui-hello
So, is there a legitimate non-RPATH work around for this?
Is there an lt_ library function I have not found which will give me a
list of all dependencies for a given .so so those can be loaded first?
Thanks,
--
Roland Hughes, President
Logikal Solutions
(630)-205-1593 (cell)
https://theminimumyouneedtoknow.com
https://infiniteexposure.net
https://johnsmith-book.com
