[cfe-dev] Instrumentation with Clang

[Hong Hu via cfe-dev]

Hi Clang developers,

May I know how to insert an extra function declaration at the very
beginning of the compilation?

For example, I want to add a call to function "foo", which is not defined
by the source code. Instead of  adding "extern void foo()" to each source
code manually, I'd like to use clang to do it automatically.

Regards,
Hong HU
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