[Qt-creator] How *not* hard-code Qt Project Build Environment variable LD_LIBRARY_PATH ?

[Ed Sutton]

>> Sorry, I am stuck on this...
>> 
>> When it comes to dynamically loaded shared libs that are required at link time, I can not figure out the trick of completely removing hard-coded paths from my Qt Creator project build environment.  Setting LD_LIBRARY_PATH under the Qt Project Build Environment to a relative path works fine for building / linking. Example:
>> 
>> LD_LIBRARY_PATH=/opt/qtsdk-2010.02/lib/qtcreator:/home/esutton/projects/myproject/guiproject/../../lib
>> 
>> 
>> Question: How can I replace the base part of the relative path with a variable?
>> 
>> Replacing with $(PWD), does not work.  Apparently at the build environment stage, PWD is set to the qmake working directory of "/opt/qtsdk-2010.02/qt/bin"
>> 
>> LD_LIBRARY_PATH=/opt/qtsdk-2010.02/lib/qtcreator:$(PWD)/../../lib
>> 
>> 
>> 
>> Can a variable added to the Qt project file be referenced in the Qt project Build Environment ?
>> 
>> I tried adding this to my Qt Project File:
>> 
>> MYLDLIBPATH = $$PWD/../../lib
>> message(MYLDLIBPATH == $$MYLDLIBPATH)
>> 
>> and adding a reference to this variable in the Qt project Build Environment:
>> 
>> LD_LIBRARY_PATH=/opt/qtsdk-2010.02/lib/qtcreator:$(MYLDLIBPATH)
>> 
>> This does *not* work even though the qmake message displays the desired path:
>> 
>> Project MESSAGE: MYLDLIBPATH = /home/esutton/projects/myproject/guiproject/../../lib
>> 
>> I am building under Red Hat Enterprise Linux 5.x.  I do not want to use rpath because I want to avoid hard-coded paths in released binaries.  My goal is to retrieve source code from the repository and to build a release using:
>> 
>> qmake myproject.pro
>> make
>> 
>> 
> 
> I found a solution myself for linking to shared libraries.  Use rpath-link ( Just like the linker warning had informed me ;-)  
> 
> If I understand it correctly, rpath-link, tells the linker where to look for run-time shared libs to link with and unlike rpath will not hard-code any run-time paths into my binaries.
> 
> LIBS += -L../../lib
> #Note the character following the -Wl switch is a lower-case 'L'
> LIBS += -Wl,-rpath-link,$$PWD/../../lib
> LIBS += -lmysharedlib 
> 
> -Ed

While -rpath-link solves the build environment challenge, I still have the same problem for the  Qt Project Run Environment settings in setting LD_LIBRARY_PATH.  

Can you pass a Qt project path variable to the Qt Project Run Environment settings to use for setting the LD_LIBRARY_PATH ?

Basically so any developer could get from version control, build, and debug, without having to edit any Qt project settings. 

Thanks in advance,

-Ed