[Issue 24293] ImportC: parallel compilation failure

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24293

--- Comment #3 from Walter Bright <bugzilla at digitalmars.com> ---
I'm not understanding the need for dmd to generate the .i file rather than cpp?
I'm also not understanding the reentrancy problem - are multiple .i files being
generated with the same base name, thus conflicting with each other?

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