cmake hangs if rdm is in PATH

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Describe the bug Trying to rebuild rtags while having rdm in PATH hangs at cmake step.

To Reproduce

1. Build rtags normally:

   $ git clone --recursive https://github.com/Andersbakken/rtags.git
   $ cd rtags
   $ mkdir build
   $ cd build
   $ cmake ..
   $ make

2. Add bin to PATH and try to rebuild rtags in a different directory:

   $ export PATH=`pwd`/bin:$PATH
   $ cd ..
   $ mkdir build2
   $ cd build2
   $ cmake ..
   -- The C compiler identification is GNU 7.5.0
   -- The CXX compiler identification is GNU 7.5.0
   -- Check for working C compiler: /usr/bin/cc <-- HANGS

3. Check that rdm is running and kill it:

   $ pgrep rdm
   22109
   $ kill 22109

4. cmake continues one step further and hangs again:

   ...
   -- Check for working C compiler: /usr/bin/cc -- works
   -- Detecting C compiler ABI info <-- HANGS

Expected behavior Nothing hangs.

Environment:

• Ubuntu 18.04
• RTags: 4ecf19b6
• LLVM/Clang: 6.0

Additional context Why there would be unsolicited rmd execution in the first place?

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Never mind, the problem was on my side. I forgot about my make alias that would start rdm automatically to accommodate gcc-rtags-wrapper.sh.