Test Header-only Library (ECP SICM/Metall)

[KIwabuchi]

Hello,

I'm one of the developers of the ECP Metall library and trying to add Metall's test to this Testsuite project.

Our ECP Metall is a header-only library.
Because of that, its Spack package installs/depends on a compiler only when Spack's build-time test is enabled.

Could I have Testsuite install a proper compiler during the setup step?

Or can we assume that Spack's build-time test is always enabled when E4S installs Metall?

Thank you,
Keita

[wspear]

@KIwabuchi Greetings. The e4s testsuite cannot assume it has write privileges for the target spack so no installations are possible, however the compiler is determined by the test environment, not by individual packages, so one should be available for the testsuite test. I'm not sure how Spack's build time tests operate in this regard. Installing googletest at test runtime isn't possible so ideally we can get a simple example that can be built and run directly for use in the testsuite.