Fix macos gcc linkage error in myproj test

Author: FeignClaims

src/Utilities.cmake

@@ -125,6 +125,15 @@ function(detect_architecture arch)
   endif()
 endfunction()
 
+function(detect_macos_version version)
+  find_program(SW_VERS_EXECUTABLE sw_vers)
+  execute_process(
+    COMMAND "${SW_VERS_EXECUTABLE}" -productVersion
+    OUTPUT_VARIABLE MACOS_VERSION
+  )
+  set(${version} "${MACOS_VERSION}" PARENT_SCOPE)
+endfunction()
+
 # convert semicolons in generator expression to $<SEMICOLON>
 function(convert_genex_semicolons genex output)
   set(result)

tests/myproj/CMakeLists.txt

@@ -83,6 +83,13 @@ project_options(
 # Executable
 add_executable(main ./src/main/main.cpp)
 target_link_libraries(main PRIVATE myproj_project_options myproj_project_warnings)
+if(APPLE)
+  detect_macos_version(apple_version)
+  if (apple_version VERSION_GREATER_EQUAL 13)
+    # workaround for linkage error as described in https://github.com/Homebrew/homebrew-core/issues/145991
+    target_link_options(main PRIVATE -ld_classic)
+  endif()
+endif()
 
 ## dependencies
 set(DEPENDENCIES_CONFIGURED fmt Eigen3 docopt)