[CMake] cmake build issue with symlinks and dependencies

[Ben Sferrazza]

 I'm trying to build libvnc, and I have run into this when building other
source code as well. For some reason cmake errors out when checking the
dependency of a symlinked file, after executing 'cmake --build .'. I'm not
sure I'm even describing that properly. It's best understood by looking at
the below. This is the relevant section of the build.make file.

libvncclient.so.0.9.12: CMakeFiles/vncclient.dir/link.txt
@$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --green --bold
--progress-dir=/home/bsferrazza/lfs/sources/libvncserver/build/CMakeFiles
--progress-num=$(CMAKE_PROGRESS_10) "Linking C shared library
libvncclient.so"
$(CMAKE_COMMAND) -E cmake_link_script CMakeFiles/vncclient.dir/link.txt
--verbose=$(VERBOSE)
$(CMAKE_COMMAND) -E cmake_symlink_library libvncclient.so.0.9.12
libvncclient.so.1 libvncclient.so

libvncclient.so.1: libvncclient.so.0.9.12
@$(CMAKE_COMMAND) -E touch_nocreate libvncclient.so.1

libvncclient.so: libvncclient.so.0.9.12
@$(CMAKE_COMMAND) -E touch_nocreate libvncclient.so

And here's the terminal output.

[  1%] Linking C shared library libvncclient.so
/home/tools/bin/cmake -E cmake_link_script CMakeFiles/vncclient.dir/link.txt
--verbose=1
/home/tools/bin/cc -fPIC   -shared -Wl,-soname,libvncclient.so.1 -o
libvncclient.so.0.9.12 CMakeFiles/vncclient.dir/libvncclient/cursor.c.o
CMakeFiles/vncclient.dir/libvncclient/listen.c.o
CMakeFiles/vncclient.dir/libvncclient/rfbproto.c.o
CMakeFiles/vncclient.dir/libvncclient/sockets.c.o
CMakeFiles/vncclient.dir/libvncclient/vncviewer.c.o
CMakeFiles/vncclient.dir/common/minilzo.c.o
CMakeFiles/vncclient.dir/common/turbojpeg.c.o
CMakeFiles/vncclient.dir/libvncclient/tls_gnutls.c.o
CMakeFiles/vncclient.dir/libvncclient/sasl.c.o -lpthread
/home/tools/lib/libgcrypt.so /home/tools/lib/libsasl2.so
/home/tools/lib/libz.so /home/tools/lib/libjpeg.so
/home/tools/lib/libgnutls.so /home/tools/lib/libssl.so
/home/tools/lib/libcrypto.so
/home/tools/bin/cmake -E cmake_symlink_library libvncclient.so.0.9.12
libvncclient.so.1 libvncclient.so
make[2]: *** [CMakeFiles/vncclient.dir/build.make:317: libvncclient.so]
Error 1
make[2]: *** Deleting file 'libvncclient.so'
make[2]: Leaving directory '/nfs/home/bsferrazza/lfs/
sources/libvncserver/build'
make[1]: *** [CMakeFiles/Makefile2:68: CMakeFiles/vncclient.dir/all] Error 2
make[1]: Leaving directory '/nfs/home/bsferrazza/lfs/
sources/libvncserver/build'
make: *** [Makefile:141: all] Error 2

You can see it run the ' cmake -E cmake_symlink_library
libvncclient.so.0.9.12' command and yet it errors out on libvncclient.so.
Oddly, if I then run that same command in the shell, and re-run 'cmake
--build .' it continues just fine. So why was that command not properly
executed within the cmake file?

Thanks,
Ben
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