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Warnings in MacOS (Wundefined-var-template) #120

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phcerdan opened this issue Mar 21, 2019 · 2 comments
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Warnings in MacOS (Wundefined-var-template) #120

phcerdan opened this issue Mar 21, 2019 · 2 comments

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@phcerdan
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phcerdan commented Mar 21, 2019 •
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Only in clang.

https://open.cdash.org/viewBuildError.php?type=1&buildid=5772807

Modules/Core/Common/include/itkNumericTraits.h:1083:36: warning: instantiation of variable 'itk::NumericTraits<std::__1::complex<double> >::Zero' required here, but no definition is available [-Wundefined-var-template]
  static Self ZeroValue() { return Zero; }
Modules/Core/Common/include/itkNumericTraits.h:1083:36: note: add an explicit instantiation declaration to suppress this warning if 'itk::NumericTraits<std::__1::complex<double> >::Zero' is explicitly instantiated in another translation unit

  static Self ZeroValue() { return Zero; }

This is related to the numeric traits of complex types:

https://github.com/InsightSoftwareConsortium/ITK/blob/c06eb6859b561ae1fb7aca8149e46769cbfe6e99/Modules/Core/Common/include/itkNumericTraits.h#L1062-L1089
@thewtex
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thewtex commented Mar 21, 2019

This can safely be suppressed with -Wno-undefined-var-template:

https://github.com/InsightSoftwareConsortium/ITK/blob/a5a1d71a3771f283e026a39702cae627800fe96a/CMake/ITKSetStandardCompilerFlags.cmake#L125

InsightSoftwareConsortium/ITK@f72c925

@phcerdan
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TODO: Add that compiler flag in CMakeLists.txt

Note: That flag is added in ITK, but because we are compiling this externally, we need to set it here too.

phcerdan added a commit to phcerdan/ITKIsotropicWavelets that referenced this issue Mar 27, 2019
@phcerdan
COMP: Add -Wno-undefined-var-template to CMAKE_CXX_FLAGS
a08efbb 
Only needed when building the template externally with a clang compiler.

Hides the following spurious warnings:

```cpp
Modules/Core/Common/include/itkNumericTraits.h:1083:36: warning:
instantiation of variable 'itk::NumericTraits<std::__1::complex<double> >::Zero'
required here, but no definition is available [-Wundefined-var-template]

  static Self ZeroValue() { return Zero; }

Modules/Core/Common/include/itkNumericTraits.h:1083:36: note: add an
explicit instantiation declaration to suppress this warning if
'itk::NumericTraits<std::__1::complex<double> >::Zero' is explicitly
instantiated in another translation unit

  static Self ZeroValue() { return Zero; }
```

Fixes InsightSoftwareConsortium#120
@phcerdan phcerdan mentioned this issue Mar 27, 2019
Merged
phcerdan added a commit to phcerdan/ITKIsotropicWavelets that referenced this issue Mar 27, 2019
@phcerdan
COMP: Add -Wno-undefined-var-template to CMAKE_CXX_FLAGS
4620e72 
Only needed when building the template externally with a clang compiler.

Hides the following spurious warnings:

```cpp
Modules/Core/Common/include/itkNumericTraits.h:1083:36: warning:
instantiation of variable 'itk::NumericTraits<std::__1::complex<double> >::Zero'
required here, but no definition is available [-Wundefined-var-template]

  static Self ZeroValue() { return Zero; }

Modules/Core/Common/include/itkNumericTraits.h:1083:36: note: add an
explicit instantiation declaration to suppress this warning if
'itk::NumericTraits<std::__1::complex<double> >::Zero' is explicitly
instantiated in another translation unit

  static Self ZeroValue() { return Zero; }
```

Fixes InsightSoftwareConsortium#120
phcerdan added a commit to phcerdan/ITKIsotropicWavelets that referenced this issue Mar 28, 2019
@phcerdan
COMP: Add -Wno-undefined-var-template to CMAKE_CXX_FLAGS
17a62c7 
Only needed when building the template externally with a clang compiler.

Hides the following spurious warnings:

```cpp
Modules/Core/Common/include/itkNumericTraits.h:1083:36: warning:
instantiation of variable 'itk::NumericTraits<std::__1::complex<double> >::Zero'
required here, but no definition is available [-Wundefined-var-template]

  static Self ZeroValue() { return Zero; }

Modules/Core/Common/include/itkNumericTraits.h:1083:36: note: add an
explicit instantiation declaration to suppress this warning if
'itk::NumericTraits<std::__1::complex<double> >::Zero' is explicitly
instantiated in another translation unit

  static Self ZeroValue() { return Zero; }
```

Fixes InsightSoftwareConsortium#120
@macsforme macsforme mentioned this issue Jul 3, 2019
Closed
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@thewtex @phcerdan