GOTCHA fails parallel build when enabling tests

[Thyre]

When trying to build GOTCHA v1.0.7 or the develop branch, both fail to build in parallel after successfully running CMake when one enables tests.

The error message itself is quite simple:

/home/jreuter/Downloads/GOTCHA/test/unit/gotcha_unit_tests.c:18:10: fatal error: check.h: No such file or directory
   18 | #include <check.h>
      |          ^~~~~~~~~
compilation terminated.

It looks like the ExternalProject_Add command does not run before building the actual test, but afterwards (see log down below). Rerunning make works fine after the first try failed, but this is not really desirable for build systems.

---

Reproducing the issue

I've used Arch Linux with CMake 3.30.3, but this should be reproducible with other distributions and CMake versions.

$ git clone https://github.com/LLNL/GOTCHA.git
$ cd GOTCHA
$ cmake -S . -B build -DGOTCHA_ENABLE_TESTS=ON
CMake Deprecation Warning at CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 3.5 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- The C compiler identification is GNU 14.2.1
-- The CXX compiler identification is GNU 14.2.1
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Performing Test COMPILER_SUPPORTS_CXX11
-- Performing Test COMPILER_SUPPORTS_CXX11 - Success
-- Found Git: /usr/bin/git (found version "2.46.0")
-- Configuring done (0.3s)
-- Generating done (0.0s)
-- Build files have been written to: /home/jreuter/Downloads/GOTCHA/build
$ cmake --build build --parallel 2

Compile log:

Click to expand

[  1%] Building C object src/CMakeFiles/gotcha_no_libc.dir/gotcha_utils.c.o
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CMake Deprecation Warning at CMakeLists.txt:42 (cmake_policy):
  The OLD behavior for policy CMP0076 will be removed from a future version
  of CMake.

  The cmake-policies(7) manual explains that the OLD behaviors of all
  policies are deprecated and that a policy should be set to OLD only under
  specific short-term circumstances.  Projects should be ported to the NEW
  behavior and not rely on setting a policy to OLD.


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-- Setting build type to 'Debug' as none was specified.
[ 63%] Built target wrap_me
-- Looking for include file sys/types.h
[ 64%] Building C object test/unit/CMakeFiles/unit_tests.dir/gotcha_unit_tests.c.o
/home/jreuter/Downloads/GOTCHA/test/unit/gotcha_unit_tests.c:18:10: fatal error: check.h: No such file or directory
   18 | #include <check.h>
      |          ^~~~~~~~~
compilation terminated.
make[2]: *** [test/unit/CMakeFiles/unit_tests.dir/build.make:76: test/unit/CMakeFiles/unit_tests.dir/gotcha_unit_tests.c.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:698: test/unit/CMakeFiles/unit_tests.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
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