Properly handle startup reporter registration errors

src/CMakeLists.txt

@@ -120,7 +120,6 @@ set(INTERNAL_HEADERS
     ${SOURCES_DIR}/internal/catch_preprocessor_remove_parens.hpp
     ${SOURCES_DIR}/internal/catch_random_number_generator.hpp
     ${SOURCES_DIR}/internal/catch_random_seed_generation.hpp
-    ${SOURCES_DIR}/reporters/catch_reporter_registrars.hpp
     ${SOURCES_DIR}/internal/catch_reporter_registry.hpp
     ${SOURCES_DIR}/internal/catch_reporter_spec_parser.hpp
     ${SOURCES_DIR}/internal/catch_result_type.hpp
@@ -237,6 +236,7 @@ set(REPORTER_HEADERS
     ${SOURCES_DIR}/reporters/catch_reporter_helpers.hpp
     ${SOURCES_DIR}/reporters/catch_reporter_junit.hpp
     ${SOURCES_DIR}/reporters/catch_reporter_multi.hpp
+    ${SOURCES_DIR}/reporters/catch_reporter_registrars.hpp
     ${SOURCES_DIR}/reporters/catch_reporter_sonarqube.hpp
     ${SOURCES_DIR}/reporters/catch_reporter_streaming_base.hpp
     ${SOURCES_DIR}/reporters/catch_reporter_tap.hpp
@@ -252,6 +252,7 @@ set(REPORTER_SOURCES
     ${SOURCES_DIR}/reporters/catch_reporter_cumulative_base.cpp
     ${SOURCES_DIR}/reporters/catch_reporter_junit.cpp
     ${SOURCES_DIR}/reporters/catch_reporter_multi.cpp
+    ${SOURCES_DIR}/reporters/catch_reporter_registrars.cpp
     ${SOURCES_DIR}/reporters/catch_reporter_sonarqube.cpp
     ${SOURCES_DIR}/reporters/catch_reporter_streaming_base.cpp
     ${SOURCES_DIR}/reporters/catch_reporter_tap.cpp

src/catch2/reporters/catch_reporter_registrars.cpp

@@ -0,0 +1,30 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
+#include <catch2/reporters/catch_reporter_registrars.hpp>
+
+#include <catch2/internal/catch_compiler_capabilities.hpp>
+
+namespace Catch {
+    namespace Detail {
+
+        void registerReporterImpl( std::string const& name,
+                                   IReporterFactoryPtr reporterPtr ) {
+            CATCH_TRY {
+                getMutableRegistryHub().registerReporter(
+                    name, CATCH_MOVE( reporterPtr ) );
+            }
+            CATCH_CATCH_ALL {
+                // Do not throw when constructing global objects, instead
+                // register the exception to be processed later
+                getMutableRegistryHub().registerStartupException();
+            }
+        }
+
+    } // namespace Detail
+} // namespace Catch

src/catch2/reporters/catch_reporter_registrars.hpp

@@ -12,6 +12,7 @@
 #include <catch2/interfaces/catch_interfaces_reporter.hpp>
 #include <catch2/interfaces/catch_interfaces_reporter_factory.hpp>
 #include <catch2/internal/catch_compiler_capabilities.hpp>
+#include <catch2/internal/catch_unique_name.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 #include <catch2/internal/catch_void_type.hpp>
@@ -21,6 +22,7 @@
 namespace Catch {
 
     namespace Detail {
+
         template <typename T, typename = void>
         struct has_description : std::false_type {};
 
@@ -29,7 +31,13 @@ namespace Catch {
             T,
             void_t<decltype( T::getDescription() )>>
             : std::true_type {};
-    }
+
+        //! Indirection for reporter registration, so that the error handling is
+        //! independent on the reporter's concrete type
+        void registerReporterImpl( std::string const& name,
+                                   IReporterFactoryPtr reporterPtr );
+
+    } // namespace Detail
 
     class IEventListener;
     using IEventListenerPtr = Detail::unique_ptr<IEventListener>;
@@ -51,7 +59,8 @@ namespace Catch {
     class ReporterRegistrar {
     public:
         explicit ReporterRegistrar( std::string const& name ) {
-            getMutableRegistryHub().registerReporter( name, Detail::make_unique<ReporterFactory<T>>() );
+            registerReporterImpl( name,
+                                  Detail::make_unique<ReporterFactory<T>>() );
         }
     };
 
@@ -98,14 +107,21 @@ namespace Catch {
 #    define CATCH_REGISTER_REPORTER( name, reporterType )                      \
         CATCH_INTERNAL_START_WARNINGS_SUPPRESSION                              \
         CATCH_INTERNAL_SUPPRESS_GLOBALS_WARNINGS                               \
-    namespace{ Catch::ReporterRegistrar<reporterType> catch_internal_RegistrarFor##reporterType( name ); } \
+        namespace {                                                            \
+            Catch::ReporterRegistrar<reporterType> INTERNAL_CATCH_UNIQUE_NAME( \
+                catch_internal_RegistrarFor )( name );                         \
+        }                                                                      \
         CATCH_INTERNAL_STOP_WARNINGS_SUPPRESSION
 
 #    define CATCH_REGISTER_LISTENER( listenerType )                            \
         CATCH_INTERNAL_START_WARNINGS_SUPPRESSION                              \
         CATCH_INTERNAL_SUPPRESS_GLOBALS_WARNINGS                               \
-    namespace { Catch::ListenerRegistrar<listenerType> catch_internal_RegistrarFor##listenerType(#listenerType); } \
+        namespace {                                                            \
+            Catch::ListenerRegistrar<listenerType> INTERNAL_CATCH_UNIQUE_NAME( \
+                catch_internal_RegistrarFor )( #listenerType );                \
+        }                                                                      \
         CATCH_INTERNAL_STOP_WARNINGS_SUPPRESSION
+
 #else // CATCH_CONFIG_DISABLE
 
 #define CATCH_REGISTER_REPORTER(name, reporterType)

tests/ExtraTests/CMakeLists.txt

@@ -421,6 +421,20 @@ set_tests_properties(
     FAIL_REGULAR_EXPRESSION "error: .* already defined\\."
 )
 
+
+add_executable(DuplicatedReporters ${TESTS_DIR}/X35-DuplicatedReporterNames.cpp)
+target_link_libraries(DuplicatedReporters PRIVATE Catch2::Catch2WithMain)
+add_test(
+  NAME Reporters::RegistrationErrorsAreCaught
+  COMMAND $<TARGET_FILE:DuplicatedReporters>
+)
+set_tests_properties(
+    Reporters::RegistrationErrorsAreCaught
+  PROPERTIES
+    PASS_REGULAR_EXPRESSION "Errors occurred during startup!"
+)
+
+
 #add_executable(DebugBreakMacros ${TESTS_DIR}/X12-CustomDebugBreakMacro.cpp)
 #target_link_libraries(DebugBreakMacros Catch2)
 #add_test(NAME DebugBreakMacros COMMAND DebugBreakMacros --break)

tests/ExtraTests/X35-DuplicatedReporterNames.cpp

@@ -0,0 +1,31 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
+/**\file
+ * Checks that reporter registration errors are caught and handled as
+ * startup errors, by causing a registration error by registering multiple
+ * reporters with the same name.
+ */
+
+#include <catch2/catch_test_macros.hpp>
+
+#include <catch2/reporters/catch_reporter_registrars.hpp>
+#include <catch2/reporters/catch_reporter_streaming_base.hpp>
+
+namespace {
+    //! Trivial custom reporter for registration
+    class TestReporter : public Catch::StreamingReporterBase {
+    public:
+        using StreamingReporterBase::StreamingReporterBase;
+
+        static std::string getDescription() { return "X35 test reporter"; }
+    };
+}
+
+CATCH_REGISTER_REPORTER( "test-reporter", TestReporter )
+CATCH_REGISTER_REPORTER( "test-reporter", TestReporter )