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

4. Check that rdm is running and kill it:

$ pgrep rdm
22109
$ kill 22109

5. 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: 4ecf19b
• 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.