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GNU's LTO has a tendency to remove __pre_init, which is written in
inline assembly. It doesn't realize that the reset handler references
this symbol, because the reset handler is also written in inline
assembly. Not sure why LLVM's linker doesn't also optimize it away, but
this commit ensures that __pre_init remains in the output file.
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Users can define their device configuration data (DCD), and place the
data in the .dcd section. If the .dcd section has content, the entry in
the IVT points at the user's DCD. This plays well with imxrt-dcd.
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We can still maintain individual linker script components, then write
them into one, larger linker script. We're effectively implementing the
same behavior as INCLUDE while disallowing overrides of the linker
search path to find the INCLUDEd files.
Once we have one linker script, we can refactor for easier unit testing.
This commit adds simple unit tests for the default builder, and some of
the expected errors.
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