list of dependencies to leverage from compat layer --filter-deps

[boegel]

In the initial version of the pilot stack (2020.08), we heavily relied on dependencies provided through EasyBuild, as is usually done with EasyBuild in a "normal" setup, to avoid relying on the underlying OS.

In the 2020.09 revision, we switched to leveraging a bunch of low-level dependencies from the compat layer, via --filter-deps=Autoconf,Automake,Autotools,binutils,bzip2,gettext,libreadline,libtool,M4,ncurses,XZ,zlib, motivated by being able to pick up on security updates for these, and avoid a bunch of extra modules in the software layer.

We did run into some minor problems because of that which had to be fixed in EasyBuild, including:

• binutils
  • gcc provided by GCCcore module uses /usr/bin/ld.gold at runtime (first ld.gold found via $PATH) outside of startprefix environment;
• ncurses
  • fix installation of LAME, because by default ncurses in Prefix is built with a separate libtinfo library;
• zlib
  • fix installation of Qt5 5.14.1, because the OF macro provided by zlib was renamed to _Z_OF in Gentoo;
  • make easyblock for installing CMake aware of --sysroot , required when zlib is installed in alternate sysroot;
  • fix XML (R package) easyblock to avoid requiring zlib as dependency provided through EasyBuild;

[boegel]

Another problem popped up when also including Bison in --filter-deps, see #49