Shared libraries with undefined symbols

[Jon Turney]

On 18/04/2025 19:02, Camm Maguire wrote:
> Greetings!
> 
> Is there an equivalent to
> 
> gcc -shared -Wl,-undefined -Wl,dynamic_lookup o/boot.c -o unixport/libboot.so
> 
> or
> 
> gcc -shared -Wl,--allow-shlib-undefined o/boot.c -o unixport/libboot.so
> 

No.

PE/COFF executables work very differently to ELF, and the dynamic 
library which provides a symbol must be known *at link-time*.


The following FAQs touch upon this subject, even if they (perhaps 
unhelpfully) don't mention it directly.

https://cygwin.com/faq.html#faq.programming.linker
https://cygwin.com/faq.html#faq.programming.unix-gui

(That last one should probably also reference flexdll as a possible 
solution, if it's absolutely necessary to emulate ELF-like load-time 
symbol resolution.)




P.S.:

Please compose new email, rather than replying to an unrelated one, when 
raising a new topic.