Failed to compile Drogon on Windows with MinGW64

[HanWangwang]

Describe the bug
I try to compile drogon with MinGW64.
Linker errors occur in hiredis when compiling drogon_ctrl and examples.
If don't build drogon_ctrl and examples or don't build redis, it will success.
When using the hiredis library alone, it works properly; when using Drogon alone, it works properly; however, when they are used together, they do not work properly.
To Reproduce
Steps to reproduce the behavior:

1. conan install .. -s compiler="gcc" -s compiler.version=13.2 -s compiler.cppstd=17 -s compiler.libcxx=libstdc++11 -s build_type=Debug --output-folder . --build=missing
2. cmake .. -DCMAKE_BUILD_TYPE=Debug -DCMAKE_TOOLCHAIN_FILE="conan_toolchain.cmake" -DCMAKE_INSTALL_PREFIX="D:/dev" -G "MinGW Makefiles"
3. cmake --build . --parallel --target install

D:/dev/mingw/MinGW/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/Users/97083/.conan2/p/b/hireddbb584c483d32/p/lib/libhiredis.a(sockcompat.c.obj): in function `win32_gai_strerror':
C:/Users/97083/.conan2/p/b/hireddbb584c483d32/b/src/sockcompat.c:146:(.text+0x3aa): undefined reference to `gai_strerrorA'
D:/dev/mingw/MinGW/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/Users/97083/.conan2/p/b/hireddbb584c483d32/p/lib/libhiredis.a(sockcompat.c.obj): in function `win32_poll':
C:/Users/97083/.conan2/p/b/hireddbb584c483d32/b/src/sockcompat.c:244:(.text+0x84a): undefined reference to `WSAPoll'

It looks like a ws2_32 linking issue, but explicitly adding ws2_32 in the CMakeLists did not resolve the problem.
I switch to MinGW 14.2 did not resolve the problem.
Platform

• OS: windows10
• MinGW64:13.2 or 14.2

[an-tao]

This seems to be an issue with the hiredis library's support for MinGW64

[HanWangwang]

I tried again, and after modifying findHiredis.cmake, the issue was resolved.

if(MINGW)
        target_link_libraries(Hiredis_lib INTERFACE ws2_32)
endif()