Update platforms

[koecher]

• fedora
• macos
• opensuse (Leap/15)
• ubuntu

[koecher]

@tjhei can you have a look on that PR?

[koecher]

A commit for recent openSuse systems is coming soon, I need to collect my changes first.

[ghost]

When using ubuntu 20.04 and intel's 11gen cores (TigerLake) it is only possible to use native compiler optimizations if the default gcc/g++ version is updated from 9 to 10. A possible way to achive this is to install the packages gcc-10 g++-10 etc. from apt and update the alternatives (see below). I think it would be helpful to add such a comment in the ubuntu20 platform file just below the comment on what packages are assumed to be installed?

Use GNU gcc g++ gfortran version 10 by default

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 10
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 20
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-9 10
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-10 20
sudo update-alternatives --install /usr/bin/gfortran gfortran /usr/bin/gfortran-9 10
sudo update-alternatives --install /usr/bin/gfortran gfortran /usr/bin/gfortran-10 20

[tjhei]

it is only possible to use native compiler optimizations if the default gcc/g++ version is updated from 9 to 10

What happens otherwise?

[koecher]

it is only possible to use native compiler optimizations if the default gcc/g++ version is updated from 9 to 10

What happens otherwise?

I think @gfcas told me, that then the CPU isn't recognized. As the switch NATIVE_OPTIMIZATIONS=OFF by default, I've added some additional remarks for that to the ubuntu20.platform file.

[tjhei]

I see. But this is not specific to Ubuntu 20.04 but any system where the compiler is older than the hardware generation.

[ghost]

it is only possible to use native compiler optimizations if the default gcc/g++ version is updated from 9 to 10

What happens otherwise?

Let me rerun the install tomorrow.

[ghost]

Sorry, forgot, that I crashed my laptop with 11gen intel and have now an older pc... If you are interested in the error message I can test it as soon as I get the new laptop?