py-cmake: only run test suite when run_tests (#43246)

As the cmake build is triggered by scikit build, the usual spack option
for enabling tests had no effect and the heavy test suite ran all the time.

Used https://github.com/scikit-build/cmake-python-distributions/issues/172#issuecomment-890322263
to implement how to pass options to the actual `cmake` build.

I also excluded some tests that failed for me on alma9 (gcc 11.4.1),
so the rest of the test suite can be run.

1 files changed, 13 insertions, 0 deletions

diff --git a/var/spack/repos/builtin/packages/py-cmake/package.py b/var/spack/repos/builtin/packages/py-cmake/package.py
index db15cd8259..c97016e15a 100644
--- a/var/spack/repos/builtin/packages/py-cmake/package.py
+++ b/var/spack/repos/builtin/packages/py-cmake/package.py
@@ -53,3 +53,16 @@ class PyCmake(PythonPackage):
 
     def install_options(self, spec, prefix):
         return ["-DBUILD_CMAKE_FROM_SOURCE=ON", "-DCMakeProject_SOURCE_DIR=cmake-src"]
+
+    def setup_build_environment(self, env):
+        if self.run_tests:
+            env.set(
+                "SKBUILD_CONFIGURE_OPTIONS",
+                # BootstrapTest is already exlcude upstream,
+                # The rest are (non-understood) known failures, disabled to get test suite working
+                # todo: investigate test failures / check if still needed in newer versions
+                "-DRUN_CMAKE_TEST=ON -DRUN_CMAKE_TEST_EXCLUDE=BootstrapTest|CompileWarningAsError"
+                "|GET_RUNTIME_DEPENDENCIES",
+            )
+        else:
+            env.set("SKBUILD_CONFIGURE_OPTIONS", "-DRUN_CMAKE_TEST=OFF")