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fix: upload README update

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Djairo Hougee 2024-04-18 15:51:02 +02:00
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opening-hdf5/README.md
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@ -20,5 +20,16 @@ make
```
### Building with Linux
Makes use of `mdspan` which is not supported by GCC libstdc++ at time of writing. See [compiler support](https://en.cppreference.com/w/cpp/compiler_support/23) for `mdspan`. Probably you will need to install Clang libc++.
Makes use of `mdspan` which is not supported by GCC libstdc++ at time of writing. See [compiler support](https://en.cppreference.com/w/cpp/compiler_support/23) for `mdspan`. The solution to this is to use Clang and libc++; this is configured in our CMake setup, however the default installation of the `netcdf-cxx` package on at least Arch linux (and suspectedly Debian derivatves as well) specifically builds for the glibc implementation. To get the netcdf C++ bindings functional with the libc++ implementation, one needs to build from source. On Linux, this requires a few changes to the CMake file included with the netcdf-cxx source code, which are detailed below.
Step-by-step to build the program using clang++ and libc++ on linux:
1. Download the source code of netcdf-cxx, found at 'https://github.com/Unidata/netcdf-cxx4/releases/tag/v4.3.1' (make sure to download the release source code, as the master branch contains non-compilable code).
2. Build the source code with the following flags:
```sh
mkdir build && cd build
cmake .. -DCMAKE_CXX_COMPILER=/usr/bin/clang++
make
ctest
make install
```
3. Now the code should compile through the standard steps described in the Compiling section.