improved constraint conflict error message (#9975)

2018-12-04 05:19:57 -08:00 · 2018-12-04 05:19:57 -08:00 · 34f64f1f3f
commit 34f64f1f3f
parent e3aa36f4cb
1 changed files with 8 additions and 2 deletions
--- a/lib/spack/spack/spec.py
+++ b/lib/spack/spack/spec.py
@ -2053,8 +2053,14 @@ def _evaluate_dependency_conditions(self, name):
                try:
                    dep.merge(dependency)
                except UnsatisfiableSpecError as e:
-                    e.message = ("Conflicting conditional dependencies on"
-                                 "package %s for spec %s" % (self.name, self))
+                    e.message = (
+                        "Conflicting conditional dependencies for spec"
+                        "\n\n\t{0}\n\n"
+                        "Cannot merge constraint"
+                        "\n\n\t{1}\n\n"
+                        "into"
+                        "\n\n\t{2}"
+                        .format(self, dependency.spec, dep.spec))
                    raise e

        return dep