adamdebreceni commented on a change in pull request #1211:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1211#discussion_r749251629



##########
File path: cmake/Extensions.cmake
##########
@@ -22,10 +22,31 @@ define_property(GLOBAL PROPERTY EXTENSION-OPTIONS
 
 set_property(GLOBAL PROPERTY EXTENSION-OPTIONS "")
 
+set(extension-build-info-file 
"${CMAKE_CURRENT_BINARY_DIR}/ExtensionBuildInfo.cpp")
+file(GENERATE OUTPUT ${extension-build-info-file}
+    CONTENT "\
+    #include \"utils/Export.h\"\n\
+    #ifdef BUILD_ID_VARIABLE_NAME\n\
+    EXTENSIONAPI extern const char* const BUILD_ID_VARIABLE_NAME = 
\"__EXTENSION_BUILD_IDENTIFIER_BEGIN__${BUILD_IDENTIFIER}__EXTENSION_BUILD_IDENTIFIER_END__\";\n\

Review comment:
       only non-const variables are global by default, const ones have internal 
linkage unless declared extern 




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