Make tests pass by default in UBSAN mode

- Adds macros to check if botan was compiled with a certain sanitizers.
- Automatically excludes the tests that are intended to provoke undefined
  behaviour from the test bench, when botan is compiled with UBSAN.
- Changes option `--avoid-undefined` to `--no-avoid-undefined` so the
  failing tests can be explicitly activated when needed.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/tests/unit_ecdsa.cpp b/src/tests/unit_ecdsa.cpp
index dc2a43af5..f94f445ee 100644
--- a/src/tests/unit_ecdsa.cpp
+++ b/src/tests/unit_ecdsa.cpp
@@ -299,14 +299,18 @@ Test::Result test_encoding_options()
    result.test_eq("Hybrid point same size as uncompressed",
                   enc_uncompressed.size(), enc_hybrid.size());
 
-   if(Test::avoid_undefined_behavior() == false)
+#if defined(BOTAN_HAS_SANITIZER_UNDEFINED)
+   if(Test::no_avoid_undefined_behavior())
       {
+#endif
       auto invalid_format = static_cast<Botan::PointGFp::Compression_Type>(99);
 
       result.test_throws("Invalid point format throws",
                          "Invalid argument Invalid point encoding for EC_PublicKey",
                          [&] { key.set_point_encoding(invalid_format); });
+#if defined(BOTAN_HAS_SANITIZER_UNDEFINED)
       }
+#endif
 
    return result;
    }