from . import _ITKCommonPython
ImportError: dlopen(/tmp/itk-wheels-installed/lib/python3.9/site-packages/itk/_ITKCommonPython.so, 2): Library not loaded: @loader_path/.dylibs/libtbb.12.3.dylib
Referenced from: /tmp/itk-wheels-installed/lib/python3.9/site-packages/itk/_ITKCommonPython.so
Reason: no suitable image found. Did find:
/tmp/itk-wheels-installed/lib/python3.9/site-packages/itk/.dylibs/libtbb.12.3.dylib: cannot load 'libtbb.12.3.dylib' (load command 0x80000034 is unknown)
/private/tmp/itk-wheels-installed/lib/python3.9/site-packages/itk/.dylibs/libtbb.12.3.dylib: cannot load 'libtbb.12.3.dylib' (load command 0x80000034 is unknown)
```
[Inspecting](https://stackoverflow.com/questions/17143373/determine-minimum-osx-version-a-binary-was-compiled-for#comment121691803_17143373) the `libtbb.12.3.dylib` library shipped within the wheels prefix with `-cp39-cp39-macosx_10_9_x86_64`, it looks like the library was not built to target maOS 10.9:
```auto
$ cd /tmp/itk-wheels-installed/lib/python3.9/site-packages/itk/.dylibs/
$ otool -l libtbb.12.3.dylib | grep -E -A4 '(LC_VERSION_MIN_MACOSX|LC_BUILD_VERSION)' | grep -B1 sdk
platform macos
sdk 12.1
```
Additionally, it seems the library id is incorrect, instead of the hardcoded path `/DLC/itk/.dylibs/libtbb.12.3.dylib`, it should be `libtbb.12.3.dylib`:
```auto
$ otool -L libtbb.12.3.dylib
libtbb.12.3.dylib:
/DLC/itk/.dylibs/libtbb.12.3.dylib (compatibility version 12.0.0, current version 12.3.0)
/usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 1200.3.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1311.0.0)
```
.. and attempting to change it is also failing:
```auto
$ install_name_tool -id libtbb.12.3.dylib ./libtbb.12.3.dylib
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/install_name_tool: object: ./libtbb.12.3.dylib malformed object (unknown load command 5)
```
### Suggested path forward
Since the version of TBB currently built by `ITKPythonPackage` is `v2021.3.0.tar.gz` (See [here](https://github.com/InsightSoftwareConsortium/ITKPythonPackage/blob/99857101d1433e61011648a2663a01fa1bf967b1/CMakeLists.txt#L109-L110)) and the logic related to the minimum deployment target is setting the variables `CMAKE_CXX_OSX_DEPLOYMENT_TARGET_FLAG` and `CMAKE_C_OSX_DEPLOYMENT_TARGET_FLAG` (see [here](https://github.com/oneapi-src/oneTBB/blob/v2021.3.0/CMakeLists.txt#L32-L39)), the corresponding options should be passed when building oneTBB in [ITKPythonPackage/CMakeLists.txt](https://github.com/InsightSoftwareConsortium/ITKPythonPackage/blob/99857101d1433e61011648a2663a01fa1bf967b1/CMakeLists.txt#L108-L125)
```auto
-DCMAKE_CXX_OSX_DEPLOYMENT_TARGET_FLAG:STRING="-mmacosx-version-min=${osx_deployment_target}"
-DCMAKE_C_OSX_DEPLOYMENT_TARGET_FLAG:STRING="-mmacosx-version-min=${osx_deployment_target}"
```
where `osx_deployment_target` is set based on the logic already implemented in [ITKPythonPackage/scripts/macpython-build-wheels.sh](https://github.com/InsightSoftwareConsortium/ITKPythonPackage/blob/99857101d1433e61011648a2663a01fa1bf967b1/scripts/macpython-build-wheels.sh#L87-L96).
---
### Author:  [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)
#### Post date: [October 17, 2022, 7:10pm UTC](https://discourse.itk.org/t/itk-5-3rc4-post3-failure-to-load-libtbb-library-observed-on-macos-10-13/5405/2 "2022-10-17T19:10:07Z")
@jcfr thanks for the investigation and digging into this issue.
I am surprise that the [package tests](https://github.com/InsightSoftwareConsortium/ITKPythonPackage/blob/c264f7f789879e21819eab794607ea491adf0d8e/scripts/macpython-build-wheels.sh#L217-L229) were still passing.
> [@jcfr](#):
>
> ### Suggested path forward
>
> Since the version of TBB currently built by `ITKPythonPackage` is `v2021.3.0.tar.gz` (See [here](https://github.com/InsightSoftwareConsortium/ITKPythonPackage/blob/99857101d1433e61011648a2663a01fa1bf967b1/CMakeLists.txt#L109-L110)) and the logic related to the minimum deployment target is setting the variables `CMAKE_CXX_OSX_DEPLOYMENT_TARGET_FLAG` and `CMAKE_C_OSX_DEPLOYMENT_TARGET_FLAG` (see [here](https://github.com/oneapi-src/oneTBB/blob/v2021.3.0/CMakeLists.txt#L32-L39)), the corresponding options should be passed when building oneTBB in [ITKPythonPackage/CMakeLists.txt](https://github.com/InsightSoftwareConsortium/ITKPythonPackage/blob/99857101d1433e61011648a2663a01fa1bf967b1/CMakeLists.txt#L108-L125)
>
> ```auto
> -DCMAKE_CXX_OSX_DEPLOYMENT_TARGET_FLAG:STRING="-mmacosx-version-min=${osx_deployment_target}"
> -DCMAKE_C_OSX_DEPLOYMENT_TARGET_FLAG:STRING="-mmacosx-version-min=${osx_deployment_target}"
>
> ```
>
> where `osx_deployment_target` is set based on the logic already implemented in [ITKPythonPackage/scripts/macpython-build-wheels.sh](https://github.com/InsightSoftwareConsortium/ITKPythonPackage/blob/99857101d1433e61011648a2663a01fa1bf967b1/scripts/macpython-build-wheels.sh#L87-L96).
👍 could you please create a PR so you get credit for this fix?
---
### Author:  [@jcfr](https://discourse.itk.org/u/jcfr)
#### Post date: [November 2, 2022, 9:05pm UTC](https://discourse.itk.org/t/itk-5-3rc4-post3-failure-to-load-libtbb-library-observed-on-macos-10-13/5405/3 "2022-11-02T21:05:27Z")
### Pull request
> create a PR
Here is a pull request to ensure the TBB library have the expected deployment target.
See [https://github.com/InsightSoftwareConsortium/ITKPythonPackage/pull/216](https://github.com/InsightSoftwareConsortium/ITKPythonPackage/pull/216).
Once this is being tested, we will be able to also assess if additional option need to be passed to ensure the `library id ` is not hardcoded to `/DLC/itk/.dylibs/libtbb.12.3.dylib`
### `_ITKCommonPython.so` vs `libtbb.12.3.dylib`
For comparison, here is the output associated with a compiled module (e.g `_ITKCommonPython.so`) having its deployment target set:
```bash
$ otool -l ./itk/_ITKCommonPython.so | grep -E -A4 '(LC_VERSION_MIN_MACOSX|LC_BUILD_VERSION)' | grep -B1 sdk
version 10.9
sdk 12.1
```
… and the one that fail to be loaded:
```auto
$ otool -l libtbb.12.3.dylib | grep -E -A4 '(LC_VERSION_MIN_MACOSX|LC_BUILD_VERSION)' | grep -B1 sdk
platform macos
sdk 12.1
```
### Package Tests
> I am surprise that the package tests were still passing.
I am wondering if the build script where ran in the background and the logic checking for error was skipped.
That said, I also confirmed that executing `import itk; image = itk.Image[itk.UC, 2].New()` using a regular python interpreter also lead to the error.
Here is what I get on `factory-south-macos` build machine (running macOS `10.13.6`):
```bash
TEST_VENV=/tmp/itk-wheels-test-env
/Library/Frameworks/Python.framework/Versions/3.7//bin/python3.7 -m venv $TEST_VENV
$TEST_VENV/bin/python -m pip install \
itk==5.3rc4.post3 --pre
$TEST_VENV/bin/python -c "import itk; image = itk.Image[itk.UC, 2].New()"
[...]
ImportError: dlopen(/private/tmp/itk-wheels-test-env/lib/python3.7/site-packages/itk/_ITKCommonPython.so, 2): Library not loaded: @loader_path/.dylibs/libtbb.12.3.dylib
Referenced from: /private/tmp/itk-wheels-test-env/lib/python3.7/site-packages/itk/_ITKCommonPython.so
Reason: no suitable image found. Did find:
/private/tmp/itk-wheels-test-env/lib/python3.7/site-packages/itk/.dylibs/libtbb.12.3.dylib: cannot load 'libtbb.12.3.dylib' (load command 0x80000034 is unknown)
/private/tmp/itk-wheels-test-env/lib/python3.7/site-packages/itk/.dylibs/libtbb.12.3.dylib: cannot load 'libtbb.12.3.dylib' (load command 0x80000034 is unknown)
```
---
### Author:  [@jcfr](https://discourse.itk.org/u/jcfr)
#### Post date: [November 14, 2022, 1:55pm UTC](https://discourse.itk.org/t/itk-5-3rc4-post3-failure-to-load-libtbb-library-observed-on-macos-10-13/5405/4 "2022-11-14T13:55:47Z")
To follow up, thanks to the help of @Tom_Birdsong, @dzenanz and @matt.mccormick, this has been fixed in pull request [ITKPythonPackage#216](https://github.com/InsightSoftwareConsortium/ITKPythonPackage/pull/216).