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Subject:	Re: Windowless Perl
To:	The Cygwin Mailing List <cygwin AT cygwin DOT com>
References:	<5eebff75b1f37a968325ed4fc7dce3a8 AT plebeian DOT com> <87a7epgs5t DOT fsf AT Rainer DOT invalid> <3a0322aa51937847ea35009b77c1aa34 AT plebeian DOT com> <5CFFEF09 DOT 6010805 AT tlinx DOT org> <1581789244 DOT 20190618182709 AT yandex DOT ru>
From:	Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
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Date:	Tue, 18 Jun 2019 19:15:20 +0100
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On 18/06/2019 16:27, Andrey Repin wrote:
>> On 2019/06/10 13:12, Chris Wagner wrote:
>>> I didn't know about run, thanks for the tip. However when I use it to
>>> launch something from the Start Menu Run command, it still pops open a
>>> terminal window of some kind for a fraction of a second.  I'm on Windows
>>> 7.
>>>    
>> Windows has a flag set in each EXE as to whether or not it is a console
>> or GUI program.  There are tools that can set the flag in a given EXE file.
> 
> It's not a flag, it's an exported function.
> If a program exports winmain(), it's a gui program, if it exports main(), it's
> a console program.

No. It really is a flag.

See 
https://docs.microsoft.com/en-us/windows/desktop/debug/pe-format#windows-subsystem

You are describing the behaviour of (recent versions of) the Microsoft 
linker, which guesses the default value of this flag based on what 
symbols are defined

See 
https://docs.microsoft.com/en-us/cpp/build/reference/entry-entry-point-symbol, 
specifically the sentence "If the /DLL or /SUBSYSTEM option is not 
specified, the linker selects a subsystem and entry point depending on 
whether main or WinMain is defined."

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