Build failure, IOP_GROUP_TONE undefined in test_filmicrgb.c

[podiki]

Building from current commit, eb70788, I get the following failure in building

/tmp/guix-build-ansel-4.0.0-1.eb70788.drv-0/source/src/tests/unittests/iop/test_filmicrgb.c:72:37: fatal error: use of undeclared identifier 'IOP_GROUP_TONE'
  assert_int_equal(default_group(), IOP_GROUP_TONE | IOP_GROUP_TECHNICAL);
                                    ^
1 error generated.

I believe the culprit is src/common/iop_group.c being removed in d813577 I'm building on Guix (essentially same formula as building Darktable). In Guix we always try to build and run tests, so we enable that here with -DBUILD_TESTING=On. Removing that flag allows the build to succeed, but, of course, at the expense of no longer having the tests to run.

[aurelienpierre]

The tests do basically nothing and the filmic unit tests are basically just an example of how to use tests. The integration tests have "natural" variations (delta E errors) between OpenCL and plain C pathes, and between compiler optimizations, that make them really hard to read when something seemingly fails. I suggest you just disable tests, nothing meaningful is to be found there.