Improvements

• Added experimental opt-in support for thread safe assertions
  • Read the documentation for full details
• The default test run order has been changed to random
• Passing assertions are significantly faster when the reporter does not ask for assertionEnded events on passing assertions.
  • This is the default behaviour of e.g. Console or Compact reporter
  • Simple REQUIRE(true) is 60% faster in Release and 80% faster in Debug build configuration
  • Simple REQUIRE_NOTHROW is 230% faster in Release and 430% faster in Debug build configuration
  • Simple REQUIRE_THROWS is ~3% faster in Release and 20% faster in Debug build configuration (throwing introduces enough overhead that the optimizations inside Catch2 are mostly irrelevant)
• Small (2-5%) improvement if the reporter asks for assertionEnded events for passing assertions.
• The exit code constants are part of the Session API. (#2955, #2976)
• Suppressed unsigned integer overflow checking in locations with intended overflow (#2965)
• Reporters flush output after writing metadata, e.g. rng seed (#2964)
• Added unreachable after FAIL and SKIP macros (#2941)
  • This allows the compiler to understand that the execution does not continue past the macro, and avoids warnings.
• Added fast path for assertionStarting event when no reporter requires it
  • For backwards compatibility, this fast path is opt-in
  • A reporter can opt in by changing its ReporterPreferences::shouldReportAllAssertionStarts
• Improved last seen source location tracking to be more precise
  • This is used when reporting unexpected exceptions from tests

Fixes

• Fixed formatting of tags with more than 100 tests in the default --list-tags output (#2963)
• Fixed Clang-Tidy's readability-static-accessed-through-instance in tests
• Fixed most of Clang-Tidy's cppcoreguidelines-avoid-non-const-global-variables (#2582)
• The lifetime of scoped messages now strictly obeys their scope (#1759, #2019, #2959)
  • Previously Catch2 would try to keep them around during unexpected exception, to provide helpful context.
  • The amount of surprises the irregularities caused was not worth the occasional utility provided.
• TEMPLATE_TEST_CASE_SIG can handle signatures consisting of only types (#2680, #2995)
• Moved catch_test_run_info.hpp up from internal/ subfolder into the main one (#2972)

Miscellaneous

• pkg-config files are now generated at install time (#2979)
  • This fixes missing debug suffix in library names
  • This fixes install prefix mismatch between build config and actuall installation