https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87352
--- Comment #6 from Jeremy Sanders <jeremy at jeremysanders dot net> --- I think I have worked out where the problem lies. The code contains fixed-sized arrays of types containing allocatable arrays and other nested types with allocatable arrays. If I switch the fixed-sized declarations to allocatable, then the compile time and output size drastically reduce. Changing three of the declarations in the source code to allocatable fixes the problem (see attached test case patch). I've also made a much smaller testcase (only 90 lines) which highlights the problem. This source code takes 50s to compile on my system. Commenting out line 73 and uncommenting line 74 reduces the compile time to 0.4s.
