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

[Peter Seiderer <ps.report@gmx.net>]

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@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@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@gmx.net>
+---
+ 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
+
-- 
2.34.1

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