More questions about _GLOBAL
Tue Jan 29 09:59:00 GMT 2002
More questions about _GLOBAL...
Per Bothner <firstname.lastname@example.org> writes:
> Symbols of the _GLOBAL__I__XXX are used for static initializers - i.e.
> code that executed on startup, normally before main is called.
Okay, so let me get this straight: there are a lot of code snippets
called _GLOBAL_*. On startup, __main() is invoked, and calls each of
these snippets. Then my main() is called.
A few questions:
1. Since we don't know which _GLOBAL symbols should be invoked on
startup until the link phase, does this mean that the linker
actually generates the code for __main()?
2. How does the linker know which symbols should be invoked on startup
and which shouldn't? Is "_GLOBAL" a "magic prefix"?
3. Is there any way for me to remove one of these _GLOBAL__ sections
from a .o after compilation, without causing __main() to jump to an
undefined/invalid address? If I simply remove the section (strip
-R), __main() seems to call some other randomly-chosen section
instead, which, of course, causes my program to barf all over the
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