Hi all,

I'm building 7.44.0 on Windows 8.1 using Embarcadero C++-Builder 10
Seattle and get a linker error about unresolved Curl_ipv4_resolve_r
when I enable USE_IPV6=1. If I explicitly use 0 instead everything
builds OK.

Curl_ipv4_resolve_r seems to be unconditionally declared in hostip.h,
while its implementation is depending on CURLRES_IPV4 on hostip4.c and
CURLRES_IPV4 itself depends on ENABLE_IPV6 in curl_setup.h, which
itself depends on USE_IPV6.

If I manually define CURLRES_IPV4 together with USE_IPV6=1 the linker
error is resolved and I get a warning about Curl_ipvalid, because it's
now available two time in hostip4 and hostip6.

This looks like an error in hostip.h to me, because declaration of
Curl_ipv4_resolve_r should depend on CURLRES_IPV4 as well.

Any thoughts? Thanks!

Mit freundlichen Grüßen,

Thorsten Schöning

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