Logs from older checks of archived packages with pre-releases of 
gcc 10 compiled from source on Fedora 30.  Current checks with gcc 10
are part of the main checks.

Details as https://www.stats.ox.ac.uk/pub/bdr/Rconfig/r-devel-linux-x86_64-fedora-gcc

Reports of 'multiple definition' errors in installation come from gcc 10 defaulting to -fno-common: see §1.6.4.1 of 'Writing R Extensions' and

https://gcc.gnu.org/gcc-10/porting_to.html

which also covers gfortran 'Rank mismatch'.