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Message-ID: <f9a924dd-9131-4034-8622-05d78027ccf1@dronecode.org.uk>
Date: Fri, 23 May 2025 14:40:45 +0100
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User-Agent: Mozilla Thunderbird
Subject: Re: gcc links to libcmain when generating a dll
To: skidmarks <home@slipbits.com>
References: <e07d3263-f629-4276-b7a8-d977b092d24f@slipbits.com>
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Cc: cygwin@cygwin.com
In-Reply-To: <e07d3263-f629-4276-b7a8-d977b092d24f@slipbits.com>
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From: Jon Turney via Cygwin <cygwin@cygwin.com>
Reply-To: Jon Turney <jon.turney@dronecode.org.uk>
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On 23/05/2025 14:30, skidmarks via Cygwin wrote:
[...]
> Thanks!
> 
>> g++ -shared -flinker-output=dyn -o slip.dll *.o
> 
> ran with not errors.
> 
> Is there any documentation available on cygwin specific issues?
> This seems like a question that I should be able to answer on my
> own.

Indeed. We do ask people to read the FAQ before posting, and:

https://cygwin.com/faq.html#faq.programming.dll-building

points to

https://cygwin.com/cygwin-ug-net/dll.html

which is in need of updating, but mentions that you should use '-shared'.

But this isn't actually a Cygwin specific question. '-shared' is 
actually the right flag to use everywhere.

 > One residual question that a cygwin specific manual may answer> is 
why libcmain.a was included at all.

Because the linker thinks you are making an executable, which has to 
have a main function.

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