libresolv does not provide __ns_initparse, resulting in LD undefined reference

[Corinna Vinschen]

On Oct 29 22:35, Named T. Relay via Cygwin wrote:
> Hello,
> 
> Today i installed cygwin to compile a windows .exe out of a Linux source program.
> While G++ on Linux compiles it correctly into a binary, on cygwin i got an issue during linking:
> 
> $ g++ -O2 -Wall -Isrc -o bin/sealtool <SNIP> src/sign-verify.cpp -lcrypto -lssl -lcurl -lresolv
> /usr/lib/gcc/x86_64-pc-cygwin/12/../../../../x86_64-pc-cygwin/bin/ld: /tmp/ccA3GExv.o:sign-verify.cp:(.text+0x437): undefined reference to `__ns_initparse'
> /usr/lib/gcc/x86_64-pc-cygwin/12/../../../../x86_64-pc-cygwin/bin/ld: /tmp/ccA3GExv.o:sign-verify.cp:(.text+0x49a): undefined reference to `__ns_parserr'
> collect2: error: ld returned 1 exit status
> 
> >From looking at the nm results, the provided libresolv library does not include these symbols.
> (But my linux distro's version of libresolv DOES have them!)
> 
> Does anyone know why these symbols are missing?

They have never been implemented in Cygwin itself. Cygwin only has a
piece of source called minires, a simple resolver lib depending on
the underlying Windows resolver, providing the res_FOO symbols from
resolv.h.  The nameserver symbols from nameser.h are not part of the
Cywin core lib.  Maybe you have more luck with the (unmaintained)
bind libs?


Corinna