Boost.Test has dropped C++03 support.

msgpack-c adjusted it.

Author: redboltz

.github/workflows/gha.yml

@@ -60,7 +60,7 @@ jobs:
 
         case ${{ matrix.pattern }} in
           0)
-            export MSGPACK_CXX_VERSION="MSGPACK_CXX11=OFF"
+            export MSGPACK_CXX_VERSION="MSGPACK_CXX11=ON"
             ;;
           1)
             export API_VERSION=1
@@ -137,7 +137,7 @@ jobs:
         case ${{ matrix.pattern }} in
           0)
             export CXX="clang++-10"
-            export MSGPACK_CXX_VERSION="MSGPACK_CXX11=OFF"
+            export MSGPACK_CXX_VERSION="MSGPACK_CXX11=ON"
             ;;
           1)
             export CXX="g++-10"

CMakeLists.txt

@@ -24,7 +24,7 @@ SET (VERSION ${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_REVISION})
 LIST (APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake/")
 SET (GNUCXX_STD_SUPPORT_VERSION "4.3")
 
-OPTION (MSGPACK_CXX11 "Using c++11 compiler" OFF)
+OPTION (MSGPACK_CXX11 "Using c++11 compiler" ON)
 OPTION (MSGPACK_CXX14 "Using c++14 compiler" OFF)
 OPTION (MSGPACK_CXX17 "Using c++17 compiler" OFF)
 OPTION (MSGPACK_CXX20 "Using c++20 compiler" OFF)
@@ -153,6 +153,9 @@ IF (MSGPACK_GEN_COVERAGE)
 ENDIF ()
 
 IF (MSGPACK_BUILD_TESTS)
+    IF (${CMAKE_CXX_STANDARD} EQUAL 98)
+        MESSAGE (FATAL_ERROR "Tests requires C++11 or newer")
+    ENDIF ()
     IF ((CMAKE_VERSION VERSION_GREATER 3.27) OR
         (CMAKE_VERSION VERSION_EQUAL 3.27))
         CMAKE_POLICY(SET CMP0145 OLD)