gnu: dlib: Disable failing tests.

* gnu/packages/machine-learning.scm (dlib)[arguments]: Add phase
'disable-failing-tests' for tests that are known not to work in the current
release.
[inputs]: Add lapack.

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu/packages/machine-learning.scm

@@ -499,6 +499,29 @@ single hidden layer, and for multinomial log-linear models.")
              (substitute* "dlib/config.h"
                (("^//#define DLIB_DISABLE_ASSERTS") "#define DLIB_DISABLE_ASSERTS"))
              #t))
+         (add-after 'disable-asserts 'disable-failing-tests
+           (lambda _
+             ;; One test times out on MIPS, so we need to disable it.
+             ;; The rest is known to fail on non-x86_64 platforms in the current release.
+             ;; Some have been fixed in git; this list should be readjusted next update.
+             (let* ((system ,(or (%current-target-system)
+                                 (%current-system)))
+                    (disabled-tests (cond
+                                     ((string-prefix? "mips64" system)
+                                      '("object_detector" ; timeout
+                                        "data_io"))
+                                     ((string-prefix? "armhf" system)
+                                      '("learning_to_track" "max_cost_assignment"))
+                                     ((string-prefix? "i686" system)
+                                      '("optimization" "matrix2" "mpc"))
+                                     (else '()))))
+               ;; The following test fails due a bug in openblas < 0.2.18.
+               (append! disabled-tests '("empirical_map"))
+               (for-each
+                (lambda (test)
+                  (substitute* "dlib/test/makefile"
+                    (((string-append "SRC \\+= " test "\\.cpp")) "")) #t)
+                disabled-tests))))
          (replace 'check
            (lambda _
              ;; No test target, so we build and run the unit tests here.
@@ -514,7 +537,7 @@ single hidden layer, and for multinomial log-linear models.")
      `(("pkg-config" ,pkg-config)))
     (inputs
      `(("giflib" ,giflib)
-       ;("lapack" ,lapack) XXX lapack here causes test failures in some setups.
+       ("lapack" ,lapack)
        ("libjpeg" ,libjpeg)
        ("libpng" ,libpng)
        ("libx11" ,libx11)