# Mac build error in superclass array initializer in mrml volume rendering properties
**URL:** https://discourse.slicer.org/t/mac-build-error-in-superclass-array-initializer-in-mrml-volume-rendering-properties/2270
**Category:** Development
**Created:** [March 8, 2018, 5:29pm UTC](https://discourse.slicer.org/t/mac-build-error-in-superclass-array-initializer-in-mrml-volume-rendering-properties/2270 "2018-03-08T17:29:38Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [March 8, 2018, 5:29pm UTC](https://discourse.slicer.org/t/mac-build-error-in-superclass-array-initializer-in-mrml-volume-rendering-properties/2270/1 "2018-03-08T17:29:38Z")
When I build now on mac I get the error below (related to [this recent commit about volume rendering presets](https://github.com/Slicer/Slicer/commit/f4b50114908e98b1b6226f4b2e75bd95eb01e75b0)).
```auto
/Users/pieper/slicer4/latest/Slicer/Modules/Loadable/VolumeRendering/MRML/vtkMRMLVolumePropertyNode.cxx:27:19: error: expected '('
, EffectiveRange{0.0, -1.0}
^
```
> **more of the build errors**
>
> ```auto
> /Users/pieper/slicer4/latest/Slicer/Modules/Loadable/VolumeRendering/MRML/vtkMRMLVolumePropertyNode.cxx:27:20: warning: expression result unused [-Wunused-value]
> , EffectiveRange{0.0, -1.0}
> ^~~
> /Users/pieper/slicer4/latest/Slicer/Modules/Loadable/VolumeRendering/MRML/vtkMRMLVolumePropertyNode.cxx:27:29: error: expected ';' after expression
> , EffectiveRange{0.0, -1.0}
> ^
> ;
> /Users/pieper/slicer4/latest/Slicer/Modules/Loadable/VolumeRendering/MRML/vtkMRMLVolumePropertyNode.cxx:27:25: warning: expression result unused [-Wunused-value]
> , EffectiveRange{0.0, -1.0}
> ^~~~
> /Users/pieper/slicer4/latest/Slicer/Modules/Loadable/VolumeRendering/MRML/vtkMRMLVolumePropertyNode.cxx:28:3: error: expected unqualified-id
> , DisabledModify(0)
> ^
> 2 warnings and 3 errors generated.
>
> ```
I can work around it with this patch but I wonder if there’s a better solution:
```auto
vtkMRMLVolumePropertyNode::vtkMRMLVolumePropertyNode()
: VolumeProperty(NULL)
- , EffectiveRange{0.0, -1.0}
, DisabledModify(0)
{
+ this->EffectiveRange[0] = 0.0;
+ this->EffectiveRange[1] = -1.0;
```
This error doesn’t happen on the dashboard machine, maybe because it [uses a custom compiler](http://slicer-devel-archive.65872.n3.nabble.com/MacOSX-factory-build-Transitioning-from-hybrid-quot-llvm-g-quot-to-quot-clang-quot-Update-to-Qt-4-8-6-tt4032198.html#a4032199). I do not get the build error on linux.
I’m using the standard Xcode clang on mac. Does anyone else have the same problem?
```auto
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin17.4.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
```
---
### Author:  [@hherhold](https://discourse.slicer.org/u/hherhold)
#### Post date: [March 8, 2018, 7:19pm UTC](https://discourse.slicer.org/t/mac-build-error-in-superclass-array-initializer-in-mrml-volume-rendering-properties/2270/2 "2018-03-08T19:19:25Z")
I can build on my Mac - 10.12.6, my compiler:
```
~/Development/slicer/Slicer:7> llvm-gcc --version
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
```
---
### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [March 8, 2018, 7:28pm UTC](https://discourse.slicer.org/t/mac-build-error-in-superclass-array-initializer-in-mrml-volume-rendering-properties/2270/3 "2018-03-08T19:28:38Z")
Update: This error only occurs on a Qt4 build (Qt5 build on same machine works) so this is a C++ 11 issue.
---
### Author:  [@jcfr](https://discourse.slicer.org/u/jcfr)
#### Post date: [March 8, 2018, 7:29pm UTC](https://discourse.slicer.org/t/mac-build-error-in-superclass-array-initializer-in-mrml-volume-rendering-properties/2270/4 "2018-03-08T19:29:14Z")
After talking with @pieper, his build was done against Qt4. This explains the error because in that case, `C++98` was used.
Until Slicer 5 is out, I suggest we keep the code base compatible with both.
---
### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [March 8, 2018, 7:29pm UTC](https://discourse.slicer.org/t/mac-build-error-in-superclass-array-initializer-in-mrml-volume-rendering-properties/2270/5 "2018-03-08T19:29:50Z")
I’m planning to fix it like this, so we’ll remember to fix it when we switch to C++11 only.
```auto
//----------------------------------------------------------------------------
vtkMRMLVolumePropertyNode::vtkMRMLVolumePropertyNode()
: VolumeProperty(NULL)
#if __cplusplus >= 201103L
, EffectiveRange{0.0,-1.0}
#endif
, DisabledModify(0)
{
#if __cplusplus < 201103L
this->EffectiveRange[0] = 0.0;
this->EffectiveRange[1] = -1.0;
#endif
```
---
### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [March 8, 2018, 7:38pm UTC](https://discourse.slicer.org/t/mac-build-error-in-superclass-array-initializer-in-mrml-volume-rendering-properties/2270/6 "2018-03-08T19:38:47Z")
Confirmed it builds in both modes and [committed as r27027](http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&revision=27027).