Try using the macos-15 image, and set C++11 standard

Author: IshaanDesai

.github/workflows/build_and_test-mac.yaml

@@ -14,9 +14,9 @@ concurrency:
   cancel-in-progress: ${{github.event_name == 'pull_request'}}
 
 jobs:
-  build:
-    name: macOS 14 (M1)
-    runs-on: macos-14
+  build-macos:
+    name: macOS 15 (M1)
+    runs-on: macos-15
     env:
       FANS_BUILD_DIR: build
     strategy:

CMakeLists.txt

@@ -14,7 +14,7 @@ include(CMakePackageConfigHelpers)
 
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
-#set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 11)
 
 # with -fno-implicit-templates I get linker errors when using std:: stuff
 # TODO: should be developer specific, by using e.g. CMake Presets