Ivan Zhechev 35249cb7b1 [Flang] Fix error messages on Windows. ...

Flang uses positional arguments for `messages::say()`, such as "%1$s" which is only supported in MS Compilers with the `_*printf_p` form of the function. This uses a conditional macro to convert the existing `vsnprintf` used to the one needed in MS-World.

7 tests in D107575 rely on this change.

Reviewed By: Meinersbur

Differential Revision: https://reviews.llvm.org/D107654

2021-08-12 18:35:54 +01:00

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