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    1. POSmallest C++ Program that will compile
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    1. CONote that whether it indeed compiles *and links* without error depends on the toolchain. In particular, Microsoft's toolchain will by default not link it for the most common kind of Windows executable, a "GUI subsystem" executable. For that, one must use the not well-documented linker option `/entry:mainCRTStartup`.
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      1. USCheers and hth. - Alf
    2. COThe OP asked about compilation only, not linking. Regardless, C++ requires `main()` to be declared with external linkage, so if Microsoft's linker can't process such a simple translation unit without throwing an error, then I suspect it's either not operating in a standards-compliant mode, or else the C++ standard permits linkers to impose additional restrictions on translation units (in which case _no one_ can provide a program which is guaranteed to link on any conforming toolchain).
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    3. COLet me first address a simple error in your answer. The last paragraph that the return value can be omitted for `main`, is incorrect. If there is a `return`, then it must specify a return value (since the function is declared with one), and conversely, if you *meant* that a `return` can only be omitted without UB for `main`, well, it must be omitted for `noreturn` functions. The OP's wording commonly means compilation + linking, and that's the only interpretation that makes sense. Microsoft's linker (and their compiler) is *non-standard* by default.
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      1. USCheers and hth. - Alf
 

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