https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84277
simon at pushface dot org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |simon at pushface dot org --- Comment #4 from simon at pushface dot org --- For both, the c250002 failure looks like an instance of PR81114. splitting D:/opt/devel/SCRATCH/tmp.I49PZRPGFv/gcc-8.0.0/gcc-8.0.0/gcc/testsuite/ada/acats/tests/c2/c250002.a into: c250002_0.ads c250002_á.ads c250002_á.adb c250002.adb BUILD c250002.adb [...] D:/opt/devel/SCRATCH/tmp.I49PZRPGFv/gcc-8.0.0/gcc-8.0.0/gcc/xgcc -c -B/opt/devel/SCRATCH/tmp.I49PZRPGFv/gcc-8.0.0/gcc-8.0.0/gcc/ -gnatws -O2 -fno-reorder-blocks-and-partition -gnat95 -ID:/opt/devel/SCRATCH/tmp.I49PZRPGFv/gcc-8.0.0/gcc8.0.0/gcc/testsuite/ada/acats/support c250002.adb c250002.adb:6:06: file "c250002_á.ads" not found gnatmake: "c250002.adb" compilation error Interestingly, on macOS with APFS the relevant gnatchop fails with gnatchop c250002.aw splitting c250002.aw into: c250002_0.ads cannot create c250002_?.ads cannot create c250002_?.adb c250002.adb I think that APFS is rejecting a file name with an invalid UTF8 character (0xc1).