• cc (18/18) Sep 17 2019 This might be more a question about the MS linker than D, but I'm
• Adam D. Ruppe (16/17) Sep 17 2019 You have a WinMain function there. The Microsoft linker sees that

cc <cc nevernet.com> writes:

This might be more a question about the MS linker than D, but I'm 
noticing that when building with -m64 under DMD v2.087.1, it is 
no longer generating a console window when running the 
application.  Under 32-bit, it would always generate the console 
window, and I had to disable it by building with a .def file that 
specified SUBSYSTEM WINDOWS when I no longer wanted it.  Is there 
a way to instruct it to still spawn the console window for 
debugging purposes?

Sample program here: https://pastebin.com/wpLetNKP


Generates console window and main application window


Only generates main application window

I tried adding -L/SUBSYSTEM:CONSOLE to the build arguments but 
then I believe it looks for the wrong entry point and fails:

libcmt.lib(exe_main.obj) : error LNK2019: unresolved external 
symbol main referenced in function "int __cdecl 
__scrt_common_main_seh(void)" (?__scrt_common_main_seh  YAHXZ)

Adam D. Ruppe <destructionator gmail.com> writes:

On Wednesday, 18 September 2019 at 00:13:43 UTC, cc wrote:
 Sample program here: https://pastebin.com/wpLetNKP

You have a WinMain function there. The Microsoft linker sees that 
as an indication that you are writing a Windows gui application 
and thus suppresses the console window.

Inside your program, you can always call the AllocConsole() 
function to pop up a console and attach it: 
https://docs.microsoft.com/en-us/windows/console/allocconsole

So a potential fix for you to just stick

debug AllocConsole();

right inside your WinMain before doing anything else.


Or my preference is to just never write WinMain in D. Just write 
a normal D main and use -L/subsystem:windows when you don't want 
the console (note: on 64 bit using the subsystem with normal 
main(), you also need to pass `-L/entry:mainCRTStartup.` to dmd 
so it uses the right entry point), and allow the defaults if you 
do want it.