[Bug c++/110380] New: [feature request] "-pg-constexpr=coverage-output" emit coverage metrics for constexpr code evaluated at compile time

[gasper.azman at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110380

            Bug ID: 110380
           Summary: [feature request] "-pg-constexpr=coverage-output" emit
                    coverage metrics for constexpr code evaluated at
                    compile time
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gasper.azman at gmail dot com
  Target Milestone: ---

We've been converting so much code to constexpr that entire test suites are now
evaluated at compile time. This is a problem because traditional coverage
metrics have become useless, but compile time evaluation is desirable due to
deep-UB checking.

It would be nice if gcc could emit coverage metrics for code that it executed
at compile time during the build, so that prof could combine it with the rest
of the test coverage.

Probably not a high priority, but a nice-to-have at some point.