generator expression $<$<BOOL:MSVC>:dllmain.c> evaluate to dllmain.c on linux

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1

All is in title.
$<$< BOOL:MSVC>:dllmain.c> evaluate to dllmain.c on Windows which is expected, However, it evaluated to dllmain.c on linux too. Why ?

I use cmake 3.18 on both windows and linux.

2

MSVC is a variable, so it must be evaluated:

$<$< BOOL:${MSVC}>:dllmain.c>

But it is preferable to use more reliable method by targeting only the compiler you expect:

$<$<C_COMPILER_ID:MSVC>:dllmain.c>
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3

I think you likely want $<PLATFORM_ID:Windows> since even when MinGW is in use, that file should be included.

4

Thank you all