Some initializers emitted by these macros are subtly incorrect.

• MONGO_STARTUP_OPTIONS_POST emits a function with the _Store suffix instead of _Post suffix as documented.

/**
  * Macro to define an initializer function named "<fname>_Post" ...
*/
#define MONGO_STARTUP_OPTIONS_POST(fname) \
        fname##_Store, ("BeginPostStartupOptionStorage"), ("EndPostStartupOptionStorage"))

....

• Every phase has its own closed initializer range, after a Begin$X initializer and before an End$X initializer.

-#define MONGO_GENERAL_STARTUP_OPTIONS_REGISTER(fname)                    \
-    MONGO_INITIALIZER_GENERAL(fname##_Register,                          \
-                              ("BeginGeneralStartupOptionRegistration"), \
-                              ("EndGeneralStartupOptionRegistration"))

But we seem to have flubbed the MONGO_MODULE_STARTUP_OPTIONS_REGISTER rule, which is defined to occur after EndGeneralStartupOptionRegistration and before EndStartupOptionRegistration, which is two "ends" and not its own well-defined interval. I'm not sure what the implications of this are but it doesn't appear to be intentional.

-#define MONGO_MODULE_STARTUP_OPTIONS_REGISTER(fname) \

• MONGO_INITIALIZER_GENERAL(fname##_Register, \
• ("EndGeneralStartupOptionRegistration"), \
• ("EndStartupOptionRegistration"))

We should emit these macros in a more structurally clear way. There's a lot of boilerplate in src/mongo/util/options_parser/startup_option_init.h that can be reduced.