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(argc, argv, env) 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 std.zig.