Re: [boost] Clang on Windows

-----Original Message----- From: Boost [mailto:boost-bounces@lists.boost.org] On Behalf Of degski via Boost Sent: 16 March 2018 11:20 To: boost Cc: degski Subject: Re: [boost] Clang on Windows

On 15 March 2018 at 13:30, Marcel Raad via Boost wrote:

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-----Original Message----- From: Boost On Behalf Of Paul A. Bristow via Boost Sent: Donnerstag, 15. März 2018 19:05 To: boost@lists.boost.org Cc: Paul A. Bristow Subject: Re: [boost] Clang on Windows

I have got some things to work, but linking libraries produces an inexplicable (to me) link failure when trying to use Boost.Test and Clang.

I have tried this on Codeblocks when I can link to Chrono library OK, but when I try to use Boost.Test using the same test.cpp that passes using GCC7.1.0, I get a final failure

LINK : fatal error LNK1561: entry point must be defined

There is not a int main() but Boost.Test's own entry function

int unit_test_main( init_unit_test_func init_func, int argc, char* argv[] );

that I presume should be fed in place of int main()

Is this a Boost.Test config problem that makes Clang and GCC different , or am I doing something silly.

I've seen this error when /SUBSYSTEM:CONSOLE wasn't passed to the MSVC linker.

If you'd do that, you'll have an issue, but... I've just tested building an app not passing /SUBSYSTEM:CONSOLE. It builds and runs, but of course there's no console window (something flashes up, no error or problem).

I see this error on Codeblocks IDE which runs the .exe via a console, but also when built using bjam/b2. So I'm not sure if this is relevant?

I think the -flto=thin flag is possibly not properly passed around, or the vc linker (link.exe) is invoked instead of lld.exe.

I'll look into this. I note that John Maddock has <linkflags>-lmsvcrt Should I have x86_64-pc-windows-mgwin rather than x86_64-pc-windows-msvc?

As OP's libs are lto instrumented, they can only be linked with lld and the flag -flto=thin.

This is a useful info. I was unclear if/which linker should be used. (I hoped that either were useable - always the optimist!) Thanks Paul