qt55-qt3d @5.5.1_3: build fails due to assimp

[chrstphrchvz (Christopher Chavez)]

qt55-qt3d fails to detect system assimp during configure, and fails to build its bundled assimp. Not yet aware whether other Qt versions’ qt3d ports are affected.

The bundled assimp fails during linking:

Undefined symbols for architecture x86_64:
  "Assimp::Importer::SetPropertyInteger(char const*, int)", referenced from:
      Qt3D::AssimpParser::readSceneFile(QString const&) in assimpparser.o
     (maybe you meant: __ZN6Assimp8Importer18SetPropertyIntegerEPKciPb)
  "Assimp::IOSystem::CurrentDirectory() const", referenced from:
      vtable for Assimp::IOSystem in assimphelpers.o
      vtable for Qt3D::AssimpHelper::AssimpIOSystem in assimphelpers.o
ld: symbol(s) not found for architecture x86_64

But I doubt building the bundled assimp is intended: port:assimp has been specified as a library dependency, and so presumably qt55-qt3d once worked with system assimp.

Currently the system assimp is not detected due to C++11 syntax in assimp headers (present at least since assimp 5.1.0), while Xcode clang (at least 12.4 and 14 beta 3) uses C++98 by default (__cplusplus is 199711L). From config.log:

/usr/bin/clang++ -c -pipe -arch x86_64 -stdlib=libc++ -I/opt/local/include -Os -isysroot /Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX13.0.sdk -mmacosx-version-min=12.0 -fno-exceptions -Wall -W -fPIC -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I. -isystem /opt/local/include -I/opt/local/libexec/qt5/mkspecs/macx-clang -o .obj/main.o main.cpp
In file included from main.cpp:38:
In file included from /opt/local/include/assimp/scene.h:55:
/opt/local/include/assimp/mesh.h:910:81: error: expected ';' after expression
            mTextureCoordsNames = new aiString *[AI_MAX_NUMBER_OF_TEXTURECOORDS] {};
                                                                                ^
1 error generated.

I am not aware how to control CXXFLAGS for Qt module ports and possibly set -std=c++11.

[chrstphrchvz (Christopher Chavez)]

Replying to chrstphrchvz:

I am not aware how to control CXXFLAGS for Qt module ports and possibly set -std=c++11.

Found it: qt5.cxxflags-append -std=c++11

​https://github.com/macports/macports-ports/pull/15480

[chrstphrchvz (Christopher Chavez)]

Edit: NOT Duplicate of #59601

[chrstphrchvz (Christopher Chavez)]

In c122e802eee197ae7f9d4e948ab388effafde3d7/macports-ports (master):

qt55-qt3d: fix system assimp detection

Increment revision in case anyone successfully built
bundled assimp.

Fixes: #65530

[skip ci]