[Buildroot] [RFC v1] package/assimp: fix namespace related compile failure

[Peter Seiderer]

Hello *,

On Thu, 30 Dec 2021 18:25:07 +0100, Peter Seiderer <ps.report at gmx.net> wrote:

> Fixes:
>
>   - http://autobuild.buildroot.net/results/0861c66ec02a55e984577094e28b65c78b95a330
>
>   .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderScene.cpp:101:33: error: specialization of 'template<class T> void Assimp::Blender::Structure::Convert(T&, const Assimp::Blender::FileDatabase&) const' in different namespace [-fpermissive]
>            const FileDatabase &db) const {
>                                    ^
>  In file included from .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderScene.h:49:0,
>                    from .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderScene.cpp:47:
>   .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderDNA.h:266:10: error:   from definition of 'template<class T> void Assimp::Blender::Structure::Convert(T&, const Assimp::Blender::FileDatabase&) const' [-fpermissive]
>        void Convert(T &dest, const FileDatabase &db) const;
>             ^
>   .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderScene.cpp:121:33: error: specialization of 'template<class T> void Assimp::Blender::Structure::Convert(T&, const Assimp::Blender::FileDatabase&) const' in different namespace [-fpermissive]
>            const FileDatabase &db) const {
>                                    ^
>   In file included from .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderScene.h:49:0,
>                    from .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderScene.cpp:47:
>   .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderDNA.h:266:10: error:   from definition of 'template<class T> void Assimp::Blender::Structure::Convert(T&, const Assimp::Blender::FileDatabase&) const' [-fpermissive]
>        void Convert(T &dest, const FileDatabase &db) const;
>             ^
>
> Signed-off-by: Peter Seiderer <ps.report at gmx.net>
> ---
> Note:
>   - patch fixes the compile failure but did not find the root cause
>     and/or a good explanation why the template spezialisation failes
>     for Structure::Convert<CollectionObject> and
>     Structure::Convert<CollectionChild> (but not the other ones) and
>     why it is fixed by the patch...
> ---
>  ...-explicit-namespace-instead-of-using.patch | 56 +++++++++++++++++++
>  1 file changed, 56 insertions(+)
>  create mode 100644 package/assimp/0002-BlenderScene-use-explicit-namespace-instead-of-using.patch
>
> diff --git a/package/assimp/0002-BlenderScene-use-explicit-namespace-instead-of-using.patch b/package/assimp/0002-BlenderScene-use-explicit-namespace-instead-of-using.patch
> new file mode 100644
> index 0000000000..b498c3be3f
> --- /dev/null
> +++ b/package/assimp/0002-BlenderScene-use-explicit-namespace-instead-of-using.patch
> @@ -0,0 +1,56 @@
> +From a099fe7cd331a839137115db5df1733c4c1c8070 Mon Sep 17 00:00:00 2001
> +From: Peter Seiderer <ps.report at gmx.net>
> +Date: Thu, 30 Dec 2021 18:01:54 +0100
> +Subject: [PATCH] BlenderScene: use explicit namespace instead of using
> + namespace
> +
> +Fixes (using g++ Sourcery CodeBench Lite 2014.05-29 - 4.8.3 20140320):
> +
> +  .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderScene.cpp:101:33: error: specialization of 'template<class T> void Assimp::Blender::Structure::Convert(T&, const Assimp::Blender::FileDatabase&) const' in different namespace [-fpermissive]
> +           const FileDatabase &db) const {
> +                                   ^
> + In file included from .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderScene.h:49:0,
> +                   from .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderScene.cpp:47:
> +  .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderDNA.h:266:10: error:   from definition of 'template<class T> void Assimp::Blender::Structure::Convert(T&, const Assimp::Blender::FileDatabase&) const' [-fpermissive]
> +       void Convert(T &dest, const FileDatabase &db) const;
> +            ^
> +  .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderScene.cpp:121:33: error: specialization of 'template<class T> void Assimp::Blender::Structure::Convert(T&, const Assimp::Blender::FileDatabase&) const' in different namespace [-fpermissive]
> +           const FileDatabase &db) const {
> +                                   ^
> +  In file included from .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderScene.h:49:0,
> +                   from .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderScene.cpp:47:
> +  .../build/assimp-5.1.4/code/AssetLib/Blender/BlenderDNA.h:266:10: error:   from definition of 'template<class T> void Assimp::Blender::Structure::Convert(T&, const Assimp::Blender::FileDatabase&) const' [-fpermissive]
> +       void Convert(T &dest, const FileDatabase &db) const;
> +            ^
> +
> +Signed-off-by: Peter Seiderer <ps.report at gmx.net>

Upstream: https://github.com/assimp/assimp/pull/4314

Regards,
Peter

> +---
> + code/AssetLib/Blender/BlenderScene.cpp | 7 +++++--
> + 1 file changed, 5 insertions(+), 2 deletions(-)
> +
> +diff --git a/code/AssetLib/Blender/BlenderScene.cpp b/code/AssetLib/Blender/BlenderScene.cpp
> +index c93d913fc..9ad086fe6 100644
> +--- a/code/AssetLib/Blender/BlenderScene.cpp
> ++++ b/code/AssetLib/Blender/BlenderScene.cpp
> +@@ -49,8 +49,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + #include "BlenderDNA.h"
> + #include "BlenderSceneGen.h"
> +
> +-using namespace Assimp;
> +-using namespace Assimp::Blender;
> ++namespace Assimp {
> ++namespace Blender {
> +
> + //--------------------------------------------------------------------------------
> + template <>
> +@@ -885,4 +885,7 @@ void DNA::RegisterConverters() {
> +     converters["CollectionObject"] = DNA::FactoryPair(&Structure::Allocate<CollectionObject>, &Structure::Convert<CollectionObject>);
> + }
> +
> ++} // namespace Blender
> ++} //namespace Assimp
> ++
> + #endif // ASSIMP_BUILD_NO_BLEND_IMPORTER
> +--
> +2.34.1
> +