Amend 68b625901f and fix link issue with
slightly less modern libc/libresolv where not all functions have been
moved over to libc.
ld: src/network/CMakeFiles/Network.dir/kernel/qdnslookup_unix.cpp.o: in function `QDnsLookupRunnable::query(QDnsLookupReply*)':
qdnslookup_unix.cpp:(.text+0x183): undefined reference to `__res_nquery'
ld: qdnslookup_unix.cpp:(.text+0x437): undefined reference to `__dn_expand'
ld: qdnslookup_unix.cpp:(.text+0x621): undefined reference to `__dn_expand'
ld: qdnslookup_unix.cpp:(.text+0x8ff): undefined reference to `__res_nquery'
ld: qdnslookup_unix.cpp:(.text+0xbd7): undefined reference to `__dn_expand'
ld: qdnslookup_unix.cpp:(.text+0xd7f): undefined reference to `__dn_expand'
ld: qdnslookup_unix.cpp:(.text+0xf4f): undefined reference to `__dn_expand'
ld: qdnslookup_unix.cpp:(.text+0x10fa): undefined reference to `__dn_expand'
ld: qdnslookup_unix.cpp:(.text+0x131c): undefined reference to `__dn_expand'
collect2: error: ld returned 1 exit status
Change-Id: If81b292222c78d828b9fef61f30a62f1d584c183
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
There's little need for us to dynamically load it. The reasons why that
was necessary aren't in the public history (Qt 4.5 already had it[1]). I
remember writing the code in 2007-2008, I just don't remember why.
On modern Linux and FreeBSD, there's no libresolv.so any more and those
symbols have been rolled up into libc.so. It's still necessary on Darwin
systems, so this commit introduces WrapResolv.
It also resolves the unity build issues relating to libresolv symbols.
[1] https://code.qt.io/cgit/qt/qt.git/tree/src/network/kernel/qhostinfo_unix.cpp?h=v4.5.1
Task-number: QTBUG-109394
Change-Id: Ic5799e4d000b6c9395109e008780643bac52122b
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
