Liniking error in msys2 Win10 x86_64

[sidec]

There is a problem preventing build from success. Here is the relevant make log:

Scanning dependencies of target sgvisu_tilde
[ 73%] Building CXX object CMakeFiles/sgvisu_tilde.dir/src/sgvisu~.cc.obj
[ 76%] Linking CXX shared module "../sgvisu~.dll"
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0\libgcc_eh.a(unwind-seh.o):(.text+0x3d0): multiple definition of `_Unwind_Resume'; C:/Program Files/Pd/bin/pd.lib(d000176.o):(.text+0x0): first defined here
collect2.exe: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/sgvisu_tilde.dir/build.make:110: ../sgvisu~.dll] Error 1
make[1]: *** [CMakeFiles/Makefile2:161: CMakeFiles/sgvisu_tilde.dir/all] Error 2
make: *** [Makefile:103: all] Error 2

cmake configuration seems ok, here are details:

cmake -DCMAKE_BUILD_TYPE=Release  ..
-- The C compiler identification is GNU 10.2.0
-- The CXX compiler identification is GNU 10.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/msys64/mingw64/bin/gcc.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/msys64/mingw64/bin/g++.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PkgConfig: C:/msys64/mingw64/bin/pkg-config.exe (found version "1.7.3")
-- Found Puredata headers: C:/Program Files/Pd/src
-- Performing Test _test
-- Performing Test _test - Success
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE
-- Found FLTK: C:/msys64/mingw64/lib/libfltk.dll.a
-- Found static FLTK: C:/msys64/mingw64/lib/libfltk.a
-- Found StaticFLTK: TRUE
-- Found fftw3.h in path: C:/msys64/mingw64/include
-- Found library fftw3f: C:/msys64/mingw64/lib/libfftw3f.dll.a
-- Found static library fftw3f: C:/msys64/mingw64/lib/libfftw3f.a
-- Checking for module 'jack'
--   Package 'jack', required by 'virtual:world', not found
-- Configuring done
-- Generating done
-- Build files have been written to: D:/code/pd-externals/pd-visualization/build

Linking to Miller S. Puckette's "vanilla" distribution of Pd from http://msp.ucsd.edu/software.html. While trying to link with gcc build of Pd from sources in github, I encounter another error:

[...]/bin/pure-data/pd-0.51.4/src/pthread.h:260:8: error: redefinition of 'struct timespec'
  260 | struct timespec {
      |        ^~~~~~~~
In file included from C:/msys64/mingw64/x86_64-w64-mingw32/include/time.h:300,
                 from C:/Users/przem/bin/pure-data/pd-0.51.4/src/pthread.h:189,
                 from C:/msys64/mingw64/include/c++/10.2.0/x86_64-w64-mingw32/bits/gthr-default.h:35,
                 from C:/msys64/mingw64/include/c++/10.2.0/x86_64-w64-mingw32/bits/gthr.h:148,
                 from C:/msys64/mingw64/include/c++/10.2.0/ext/atomicity.h:35,
                 from C:/msys64/mingw64/include/c++/10.2.0/bits/basic_string.h:39,
                 from C:/msys64/mingw64/include/c++/10.2.0/string:55,
                 from C:/msys64/mingw64/include/c++/10.2.0/stdexcept:39,
                 from C:/msys64/mingw64/include/c++/10.2.0/system_error:41,
                 from D:/code/pd-externals/pd-visualization/src/util/unix_fd.tcc:2,
                 from D:/code/pd-externals/pd-visualization/src/util/unix_fd.h:26,
                 from D:/code/pd-externals/pd-visualization/src/util/unix.h:2,
                 from D:/code/pd-externals/pd-visualization/src/visu~.h:3,
                 from D:/code/pd-externals/pd-visualization/src/visu~.cc:1:
C:/msys64/mingw64/x86_64-w64-mingw32/include/sys/timeb.h:91:8: note: previous definition of 'struct timespec'
   91 | struct timespec {
      |        ^~~~~~~~
make[2]: *** [CMakeFiles/visu_common.dir/build.make:83: CMakeFiles/visu_common.dir/src/visu~.cc.obj] Error 1
make[1]: *** [CMakeFiles/Makefile2:269: CMakeFiles/visu_common.dir/all] Error 2
make: *** [Makefile:103: all] Error 2

Any idea how to progress? Also is there any chance to publish Deken package? Thanks

[sidec]

I succesfully linked the build by adding to CMakeList.txt

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} "-Wl,-allow-multiple-definition")

as suggested there https://stackoverflow.com/questions/11267877/mingw-multiple-definition-of-unwind-resume and external works in Pd 0.51-4 official binary distribution. I am not sure where it should go in cmake files, I just put it in CMakeList.txt, so I don't make ugly pr, but it seems like enought to make it linking.

I also added PreLoad.cmake file with

set(CMAKE_GENERATOR "Unix Makefiles" CACHE INTERNAL "" FORCE

to prevent cmake from using Visual Studio toolchain on msys2.

Awesome external and definitelly worth of being more easily available through Deken.