Add support for Catch2

Makes Catch2 available for C++ unit tests;
Adds GPM script availability to CMake.
Adds rudimentary test for rgw_hex.

Signed-off-by: Jesse F. Williamson <[email protected]>

Author: chardan

CMakeLists.txt

@@ -517,6 +517,28 @@ if(WITH_JAEGER)
   set(HAVE_JAEGER TRUE)
 endif()
 
+# Catch2 C++ Unit Test support:
+# This needs to come before any tests using Catch2.
+option(WITH_CATCH2 "Enable Catch2 unit tests" ON)
+option(WITH_SYSTEM_CATCH2 "Enable Catch2 unit tests (require system packages)" OFF)
+
+if(WITH_CATCH2)
+  # Save pre-existing definitions (if any):
+  set(ORIG_CPM_LOCAL_PACKAGES_ONLY ${CPM_USE_LOCAL_PACKAGES_ONLY})
+
+    if(WITH_SYSTEM_CATCH2)
+   set(CPM_LOCAL_PACKAGES_ONLY ON)
+  endif()
+
+  include(${CMAKE_MODULE_PATH}/CPM.cmake)
+  CPMAddPackage("gh:catchorg/[email protected]")
+
+  # Restore the original CPM settings in case someone else wants to use the module:
+  set(CPM_USE_LOCAL_PACKAGES_ONLY, ${ORIG_CPM_USE_LOCAL_PACKAGES_ONLY})
+
+  message("-- Enabled Catch2 support")
+endif()
+
 #option for RGW
 option(WITH_RADOSGW "RADOS Gateway is enabled" ON)
 option(WITH_RADOSGW_BEAST_OPENSSL "RADOS Gateway's Beast frontend uses OpenSSL" ON)
@@ -527,7 +549,7 @@ option(WITH_RADOSGW_DBSTORE "DBStore backend for RADOS Gateway" ON)
 option(WITH_RADOSGW_MOTR "CORTX-Motr backend for RADOS Gateway" OFF)
 option(WITH_RADOSGW_DAOS "DAOS backend for RADOS Gateway" OFF)
 option(WITH_RADOSGW_D4N "D4N wrapper for RADOS Gateway" ON)
-option(WITH_RADOSGW_POSIX "POSIX backend for Rados Gateway" ON)
+option(WITH_RADOSGW_POSIX "POSIX backend for RADOS Gateway" ON)
 option(WITH_RADOSGW_SELECT_PARQUET "Support for s3 select on parquet objects" ON)
 option(WITH_RADOSGW_ARROW_FLIGHT "Build arrow flight when not using system-provided arrow" OFF)
 option(WITH_RADOSGW_BACKTRACE_LOGGING "Enable backtraces in rgw logs" OFF)
@@ -835,3 +857,4 @@ add_tags(ctags
   EXCLUDE_OPTS ${CTAG_EXCLUDES}
   EXCLUDES "*.js" "*.css" ".tox" "python-common/build")
 add_custom_target(tags DEPENDS ctags)
+