zig/doc/targets.md

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# How to Add Support For More Targets
Create bootstrap code in std/bootstrap.zig and add conditional compilation
logic. This code is responsible for the real executable entry point, calling
main() and making the exit syscall when main returns.
How to pass a byvalue struct parameter in the C calling convention is
target-specific. Add logic for how to do function prototypes and function calls
for the target when an exported or external function has a byvalue struct.
Write the target-specific code in the standard library.
Update the C integer types to be the correct size for the target.
Make sure that `c_longdouble` codegens the correct floating point value.