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[clang][driver][clang-cl] Support
--precompile
and -fmodule-*
opt…
…ions in Clang-CL (llvm#98761) This PR is the first step in improving the situation for `clang-cl` detailed in [this LLVM Discourse thread](https://discourse.llvm.org/t/clang-cl-exe-support-for-c-modules/72257/28). There has been some work done in llvm#89772. I believe this is somewhat orthogonal. This is a work-in-progress; the functionality has only been tested with the [basic 'Hello World' example](https://clang.llvm.org/docs/StandardCPlusPlusModules.html#quick-start), and proper test cases need to be written. I'd like some thoughts on this, thanks! Partially resolves llvm#64118. (cherry picked from commit bd576fe)
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// RUN: %clang_cl /std:c++20 --precompile -### -- %s 2>&1 | FileCheck --check-prefix=PRECOMPILE %s | ||
// PRECOMPILE: -emit-module-interface | ||
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// RUN: %clang_cl /std:c++20 --fmodule-file=Foo=Foo.pcm -### -- %s 2>&1 | FileCheck --check-prefix=FMODULEFILE %s | ||
// FMODULEFILE: -fmodule-file=Foo=Foo.pcm | ||
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||
// RUN: %clang_cl /std:c++20 --fprebuilt-module-path=. -### -- %s 2>&1 | FileCheck --check-prefix=FPREBUILT %s | ||
// FPREBUILT: -fprebuilt-module-path=. |