--startup=symbol, --no_startup linker option
Enables the linker to use alternative C libraries with a different startup symbol if required.
By default, symbol is set to __main.
--no_startup does not take a symbol argument.
The linker includes the C library startup code if there is a reference to a symbol that is defined by the C library startup code. This symbol reference is called the startup symbol. It is automatically created by the linker when it sees a definition of main(). The --startup option enables you to change this symbol reference.
If the linker finds a definition of main() and does not find a reference to (or definition of) symbol , then it generates an error.
If the linker finds a definition of main() and a reference to (or definition of) symbol , and no entry point is specified, then the linker generates a warning.
--no_startup does not add a reference.
The default is --startup=__main.