Example zlib with VCPKG and x86_64-w64-mingw32 fails on dynamic linkage

[mschollerer]

Hi Alex,

thanks for your great work. I wanted to try out crosscompiling for the VCPKG projects. It succeeded for linux 64bit, but I have problems with the windows build...

vcpkg_test$ export CROSS_TARGET=x86_64-w64-mingw32
vcpkg_test$ export CROSS_WITH_PACKAGE_MANAGERS=1
vcpkg_test$ export CROSS_DETACH=1
vcpkg_test$ xcross vcpkg install
Detecting compiler hash for triplet x86_64-w64-mingw32-xcross...
The following packages will be built and installed:
    zlib[core]:x86_64-w64-mingw32-xcross -> 1.2.11#10
Could not locate cached archive: /home/cross/.cache/vcpkg/archives/87/87dd8171c5b42db0ab4628f4e5b21a85d87de5fd.zip
Starting package 1/1: zlib:x86_64-w64-mingw32-xcross
Building package zlib[core]:x86_64-w64-mingw32-xcross...
-- Using community triplet x86_64-w64-mingw32-xcross. This triplet configuration is not guaranteed to succeed.
-- [COMMUNITY] Loading triplet configuration from: /opt/vcpkg/triplets/community/x86_64-w64-mingw32-xcross.cmake
-- Downloading http://www.zlib.net/zlib-1.2.11.tar.gz -> zlib1211.tar.gz...
-- Downloading http://www.zlib.net/zlib-1.2.11.tar.gz... Failed. Status: 22;"HTTP response code said error"
-- Downloading https://downloads.sourceforge.net/project/libpng/zlib/1.2.11/zlib-1.2.11.tar.gz -> zlib1211.tar.gz...
-- Extracting source /opt/vcpkg/downloads/zlib1211.tar.gz
-- Applying patch cmake_dont_build_more_than_needed.patch
-- Applying patch 0001-Prevent-invalid-inclusions-when-HAVE_-is-set-to-0.patch
-- Applying patch add_debug_postfix_on_mingw.patch
-- Applying patch 0002-android-build-mingw.patch
-- Using source at /opt/vcpkg/buildtrees/zlib/src/1.2.11-e9a093319e.clean
-- Configuring x86_64-w64-mingw32-xcross-dbg
-- Configuring x86_64-w64-mingw32-xcross-rel
-- Building x86_64-w64-mingw32-xcross-dbg
-- Building x86_64-w64-mingw32-xcross-rel
-- Fixing pkgconfig file: /opt/vcpkg/packages/zlib_x86_64-w64-mingw32-xcross/lib/pkgconfig/zlib.pc
-- Fixing pkgconfig file: /opt/vcpkg/packages/zlib_x86_64-w64-mingw32-xcross/debug/lib/pkgconfig/zlib.pc
-- Installing: /opt/vcpkg/packages/zlib_x86_64-w64-mingw32-xcross/share/zlib/copyright
-- Performing post-build validation
-- Performing post-build validation done
Stored binary cache: /home/cross/.cache/vcpkg/archives/87/87dd8171c5b42db0ab4628f4e5b21a85d87de5fd.zip
Building package zlib[core]:x86_64-w64-mingw32-xcross... done
Installing package zlib[core]:x86_64-w64-mingw32-xcross...
Installing package zlib[core]:x86_64-w64-mingw32-xcross... done
Elapsed time for package zlib:x86_64-w64-mingw32-xcross: 20.55 s

Total elapsed time: 20.55 s

vcpkg_test$ xcross cmake .
-- Running vcpkg install
-- Running vcpkg install - done
-- The C compiler identification is GNU 10.2.0
-- The CXX compiler identification is GNU 10.2.0
-- Check for working C compiler: /opt/bin/cc
-- Check for working C compiler: /opt/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - failed
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /opt/bin/c++
-- Check for working CXX compiler: /opt/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - failed
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found ZLIB: vcpkg_test/vcpkg_installed/x86_64-w64-mingw32-xcross/lib/libzlib.a (found version "1.2.11")
-- Configuring done
-- Generating done
-- Build files have been written to: vcpkg_test

vcpkg_test$ xcross cmake --build .
Scanning dependencies of target zlibexec
[ 50%] Building CXX object CMakeFiles/zlibexec.dir/zlib.cc.o
[100%] Linking CXX executable zlibexec
x86_64-w64-mingw32-g++: error: unrecognized command-line option '-rdynamic'
make[2]: *** [CMakeFiles/zlibexec.dir/build.make:85: zlibexec] Error 1
make[1]: *** [CMakeFiles/Makefile2:104: CMakeFiles/zlibexec.dir/all] Error 2
make: *** [Makefile:84: all] Error 2

Do you have a clue what goes wrong? I could think of a VCPKG triplet error...

Best regards,
Michael