[CMake] Unmet dependency when builddir is a symlink out of srcdir

[Nicolas Desprès]

I have checked by calling cmake from the "real" builddir (not the
symlink) and it works fine:

$ pwd
/home/despre_n/build/test/helloworld-cmake/_build
$ cmake ~/src/test/helloworld-cmake
-- The C compiler identification is GNU
-- The CXX compiler identification is GNU
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Configuring done
-- Generating done
-- Build files have been written to:
/home/despre_n/build/test/helloworld-cmake/_build
$ make
Scanning dependencies of target helloworld
[100%] Building CXX object CMakeFiles/helloworld.dir/src/main.cc.o
Linking CXX executable helloworld
[100%] Built target helloworld

Cheers,

-Nico

2011/2/24 Nicolas Desprès <nicolas.despres at gmail.com>:
> Hi there,
>
> I am having a problem with cmake-2.8.4 for Linux with the Makefile
> generator. I have my srcdir in an encrypted partition and my builddir
> in a normal partition. For convenience I have a symlink inside my
> srcdir pointing to my buildir.
>
> Here the scenario:
> $  pwd
> /home/despre_n/src/test/helloworld-cmake     #  src is a symlink to
> /media/blabla/src (the encrypted partition)
> $ find
> .
> ./src
> ./src/main.cc
> ./CMakeLists.txt
> $ cat CMakeLists.txt
> cmake_minimum_required(VERSION 2.8)
> project(helloworld)
>
> add_executable(helloworld
>  src/main.cc
>  )
> $ cat src/main.cc
> #include <iostream>
>
> int main(void)
> {
>  std::cout << "Hello world\n" << std::endl;
>  return 0;
> }
> $ mkdir -p ~/build/test/helloworld-cmake/_build            # Out of
> the encrypted partition
> $ ln -s ~/build/test/helloworld-cmake/_build                 # Create
> the convenient symlink
> $ cd _build
> $ cmake ..
> CMake Error: The source directory
> "/home/despre_n/build/test/helloworld-cmake" does not appear to
> contain CMakeLists.txt.
> Specify --help for usage, or press the help button on the CMake GUI.
> $ cmake ~/src/test/helloworld-cmake
> -- The C compiler identification is GNU
> -- The CXX compiler identification is GNU
> -- Check for working C compiler: /usr/bin/gcc
> -- Check for working C compiler: /usr/bin/gcc -- works
> -- Detecting C compiler ABI info
> -- Detecting C compiler ABI info - done
> -- Check for working CXX compiler: /usr/bin/c++
> -- Check for working CXX compiler: /usr/bin/c++ -- works
> -- Detecting CXX compiler ABI info
> -- Detecting CXX compiler ABI info - done
> -- Configuring done
> -- Generating done
> -- Build files have been written to:
> /home/despre_n/src/test/helloworld-cmake/_build
> $ make
> -- Configuring done
> -- Generating done
> -- Build files have been written to:
> /home/despre_n/src/test/helloworld-cmake/_build
> Scanning dependencies of target helloworld
> make[2]: *** No rule to make target `../src/main.cc', needed by
> `CMakeFiles/helloworld.dir/src/main.cc.o'.  Stop.
> make[1]: *** [CMakeFiles/helloworld.dir/all] Error 2
> make: *** [all] Error 2
>
> I have tested with cmake-2.8.2 and I have the same result.
>
> I thought CMake was generating absolute path whenever possible.  Maybe
> it should resolve symlinks as well.  I don't know.  Shall I create a
> bug report?
>
> Regards,
>
> --
> Nicolas Desprès
>



-- 
Nicolas Desprès