OT: It's never done *this* before

[Mark Geisert]

Hi Achim,

On 5/13/2025 10:29 AM, ASSI via Cygwin-apps wrote:
> Mark Geisert via Cygwin-apps writes:
>> In the midst of yet another long, tedious Qt5-Base build, this happened:
[...]
>> In file included from
>> /usr/src/qt5-base-5.15.16/qt5-base-5.15.16-1.x86_64/src/qtbase-everywhere-src-5.15.16/examples/qpa/qrasterwindow/main.cpp:51:
>> ./QRasterWindow:1:3: error: stray â<80><98>\220â<80><99> in program
>>      1 |
>>      MZ<90><U+0000><U+0003><U+0000><U+0000><U+0000><U+0004><U+0000><U+0000>
>> <U+0000><ff><ff><U+0000><U+0000><b8><U+0000><U+0000><U+0000><U+0000>
>> <U+0000><U+0000><U+0000>@<U+0000><U+0000><U+0000><U+0000><U+0000>
>> <U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000>
>> <U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000>
>> <U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000>
>> <U+0000><U+0000><U+0000><U+0000><80><U+0000><U+0000><U+0000><U+000E>
>> <U+001F><ba><U+000E><U+0000><b4> <cd>!<b8><U+0001>L<cd>!This program
>> cannot be run in DOS mode.
>>        |   ^~~~
>>
>> And so on for another 136,454 error messages. Somehow g++ has ingested
>> an executable file via #include; the leading "MZ" is evidence.
>>
>> Crossed-up file descriptor(s) somewhere?  Does this count as a DoS?
> 
> No, seeing that this is C++ and the include path has "." in it, I
> suspect there's an executable with the same name as an "include <…>" in
> the cwd.  Cygwin helpfully ignores the .exe suffix on the executable in
> certain cases, why it does that here I don't know, maybe try if that
> changes with an earlier Cygwin DLL?

You were correct, of course :).  This was a cygport 'build' where I had 
neglected to clean and prep beforehand.  There was indeed an executable 
in the cwd with matching name.  I'll try to machine that situation down 
to an STC for possible reporting against Cygwin later.
Thanks & Regards,

..mark