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LCC: link with -lgfortran instead of -llfortran since 1.26.03

Igor Molchanov requested to merge makise-homura/cmake:lcc-liblfortran-renamed into master

Since LCC 1.26.03, compiler developers decided to rename liblfortran to libgfortran (internal reference: mcstbug#131633). The first commit in this MR should fix this, and the problem discussed in #23646 (closed) and causing latest nightly builds on yukari.lab.sun.mcst.ru to fail as for now.

Additionally, there's a bunch other fixes, that make CMake tests completing successfully on older versions of LCC and/or OS Elbrus, which are (a bit unfortunately) still used by people.

Performed all tests on the following setups:

  • Ubuntu20.04.3-gcc9.4.0-x86_64
  • Elbrus-OSL4.0-lcc1.23.19
  • Elbrus-OSL6.0.1-lcc1.25.14
  • Elbrus-OSL6.0-lcc1.25.17
  • Elbrus-OSL7.1-lcc1.26.12

All tests were successful, no errors or warnings issued.

Fixes: #23646 (closed)
Backport: release

Edited by Brad King

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