How to set RPATH in CMake?

ErEn · 06-02-2010, 07:09 AM

Hey all,

This is probably an easy question but somehow I couldn't manage it to work..
I was testing the C++ WT library and I have a CMakeLists.txt file as below:

Code:

ADD_EXECUTABLE(heloooo.wt
hello.C
)

SET(CMAKE_SKIP_BUILD_RPATH FALSE)

SET(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE) 

SET(CMAKE_INSTALL_RPATH "/usr/local/lib")

SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)

# for built-in httpd deployment:
TARGET_LINK_LIBRARIES(heloooo.wt
   wthttp wt
)

INCLUDE_DIRECTORIES(/usr/local/include)

So I can build the file but always get the following when I try to run:

Code:

./heloooo.wt: error while loading shared libraries: libwthttp.so.22: cannot open shared object file: No such file or directory

What am i doing wrong, I don't want to use the LD_LIBRARY_PATH, but to get the executable find the library with rpath when run?

grail · 06-02-2010, 07:27 AM

Silly question I guess but you do have that library on your system?

ErEn · 06-02-2010, 07:35 AM

Yep, I have already installed it and it actually works if i give the LD_LIBRARY_PATH like this:

Code:

LD_LIBRARY_PATH=/usr/local/lib ./heloooo.wt --docroot . --http-address 0.0.0.0 --http-port 8080

But my concern is that I don't want to use LD_LIBRARY_PATH?

ErEn · 06-02-2010, 08:33 AM

OK I found a solution to this writing my own Makefile without CMake appending this option to g++ link options:

Code:

-Wl,-rpath,/usr/local/lib

But still it would be nice to learn doing CMake way of this?

John VV · 06-02-2010, 01:20 PM

?? /usr/local/lib ??
is your system using the "local" as a mount point to the / on the computer you are sitting in front of ??? on a network install?

if not then DO NOT USE /usr/local !!!!!

ErEn · 06-07-2010, 06:19 PM

Well it is not a mount point, i don't use it over network.. I just use /usr/local/ for custom installs, i think it is easier to sort out the others this way, maybe i am wrong though..

John VV · 06-07-2010, 08:15 PM

depending on how "custom " the installs you might want that in your system path .
A lot of distros do not include
/usr/local/bin in the PATH
/usr/local/lib as one of the LD_LIBRARY_PATH
/usr/local/lib/pkgconfig as one of the PKG_CONFIG_PATH

you will need to set those ( depending on the distro)
this is done in gnome" .bash_profile " or /etc/profile or in one of the /etc/profil.d/ ???

ErEn · 06-08-2010, 12:02 PM

Hmm ok.. Thank you, I will that in mind

that's why I wanted to put the library path in the executable this way