Reid Kleckner a643e6449b [clang-cl] Treat inputs as C++ with /E, like MSVC
midl invokes the compiler on .idl files with /E. Before this change, we
would treat unrecognized inputs as object files. Now we pre-process to
stdout as expected. I checked that MSVC defines __cplusplus when invoked
this way, so treating the input as C++ seems like the right thing to do.

After this change, I was able to run midl like this with clang-cl:
$ midl -cpp_cmd clang-cl.exe foo.idl

Things worked for the example IDL file in the Microsoft documentation,
but beyond that, I don't know if this will work well.

Fixes PR40140

llvm-svn: 350072
2018-12-26 21:04:08 +00:00

19 lines
534 B
C++

// Note: %s must be preceded by --, otherwise it may be interpreted as a
// command-line option, e.g. on Mac where %s is commonly under /Users.
// Test that 'clang-cl /E' treats inputs as C++ if the extension is
// unrecognized. midl relies on this. See PR40140.
// Use a plain .cpp extension first.
// RUN: %clang_cl /E -- %s | FileCheck %s
// Copy to use .idl as the extension.
// RUN: cp %s %t.idl
// RUN: %clang_cl /E -- %t.idl | FileCheck %s
#ifdef __cplusplus
struct IsCPlusPlus {};
#endif
// CHECK: struct IsCPlusPlus {};