Support version 3 of Catch2

CMakeLists.txt

@@ -67,6 +67,10 @@ use_package(
 
 # find catch2 (required by tests)
 use_package(TARGET_NAME Catch2::Catch2 PACKAGE_NAME Catch2 LIBRARIES_VARIABLE "TEST_LIBRARIES")
+if (Catch2_VERSION VERSION_GREATER_EQUAL 3)
+    list(APPEND CATCH2_DEFINITIONS CATCH2_SPLIT_HEADERS)
+    list(APPEND TEST_LIBRARIES Catch2::Catch2WithMain)
+endif ()
 
 # find threading library (required by examples)
 use_package(TARGET_NAME Threads::Threads PACKAGE_NAME Threads LIBRARIES_VARIABLE "TEST_LIBRARIES")
@@ -100,6 +104,7 @@ include(TestUtilities)
 list(APPEND TEST_LIBRARIES ${META_TARGET_NAME})
 foreach (TEST ${TESTS})
     configure_test_target(TEST_NAME "${TEST}_tests" SRC_FILES "tests/${TEST}.cc" LIBRARIES "${TEST_LIBRARIES}")
+    target_compile_definitions("${META_TARGET_NAME}_${TEST}_tests" PRIVATE "${CATCH2_DEFINITIONS}")
 endforeach ()
 foreach (EXAMPLE ${EXAMPLES})
     configure_test_target(TEST_NAME "${EXAMPLE}_example" SRC_FILES "examples/${EXAMPLE}.cc" LIBRARIES "${TEST_LIBRARIES}")

tests/basic.cc

@@ -1,7 +1,11 @@
 #include "../lmdb-safe.hh"
 
-#define CATCH_CONFIG_MAIN
+#define CATCH_CONFIG_MAIN // for catch2 < 3
+#ifdef CATCH2_SPLIT_HEADERS
+#include <catch2/catch_all.hpp>
+#else
 #include <catch2/catch.hpp>
+#endif
 
 #include <c++utilities/application/global.h>
 

tests/typed.cc

@@ -1,8 +1,12 @@
 #include "../lmdb-boost-serialization.hh"
 #include "../lmdb-typed.hh"
 
-#define CATCH_CONFIG_MAIN
+#define CATCH_CONFIG_MAIN // for catch2 < 3
+#ifdef CATCH2_SPLIT_HEADERS
+#include <catch2/catch_all.hpp>
+#else
 #include <catch2/catch.hpp>
+#endif
 
 #include <c++utilities/application/global.h>