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From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2021-02-02 16:25:58

On 2/2/21 7:09 PM, Alexander Grund via Boost wrote:
> Peter and I found a simple way to reproduce the behavior I was seeing on
> Mac: Use libc++
> `./b2 link=shared libs/program_options/test/ toolset=clang
> stdlib=libc++` is enough to reproduce the problem.
> I'm actually surprised that this hasn't come up before. No tests for all
> boost with libc++?

I suspect, Mac OS (more precisely, its linker) is the crucial part, not
libc++. clang+libc++ on Linux is relatively well tested (or at least
used to be, when Travis was more usable), but Mac OS is less tested
because of slow turnaround.

>> when the marked symbols are only defined in the library, which is the
>> case normally. When the user consumes the library, no markup is needed
>> as the compiler will simply leave unresolved references to those
>> symbols, to be resolved by the linker.
>>  Basically, BOOST_SYMBOL_IMPORT is only there for compatibility with
>> Windows.
> Agreed with the first part.
> But quite many are defined in headers, especially the exceptions, so
> there it is required.

For classes defined in a header, neither EXPORT nor IMPORT are needed.
Only VISIBLE is, if you need publicly visible RTTI.

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