https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64672
--- Comment #3 from howarth at bromo dot med.uc.edu --- The attached reduced test case reproduces the ICE with... $ ~/dist/bin/gfortran -fopenacc -DACC_DEVICE_TYPE_host_nonshm=1 -DACC_MEM_SHARED=0 -g -flto asyncwait-1.f90 lto1: internal compiler error: in streamer_get_builtin_tree, at tree-streamer-in.c:1151 0xc266af streamer_get_builtin_tree(lto_input_block*, data_in*) ../../gcc-trunk/gcc/tree-streamer-in.c:1151 0x90aeb4 lto_input_tree_1(lto_input_block*, data_in*, LTO_tags, unsigned int) ../../gcc-trunk/gcc/lto-streamer-in.c:1320 0x90b099 lto_input_scc(lto_input_block*, data_in*, unsigned int*, unsigned int*) ../../gcc-trunk/gcc/lto-streamer-in.c:1248 0x5f88be lto_read_decls ../../gcc-trunk/gcc/lto/lto.c:1900 0x5fa930 lto_file_finalize ../../gcc-trunk/gcc/lto/lto.c:2229 0x5fa930 lto_create_files_from_ids ../../gcc-trunk/gcc/lto/lto.c:2239 0x5fa930 lto_file_read ../../gcc-trunk/gcc/lto/lto.c:2280 0x5fa930 read_cgraph_and_symbols ../../gcc-trunk/gcc/lto/lto.c:2981 0x5fa930 lto_main() ../../gcc-trunk/gcc/lto/lto.c:3436 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> for instructions. lto-wrapper: fatal error: /home/howarth/dist/bin/gfortran returned 1 exit status compilation terminated. /home/howarth/dist_binutils/bin/ld: lto-wrapper failed collect2: error: ld returned 1 exit status on x86_64 linux and... % gfortran-fsf-5.0 -fopenacc -DACC_DEVICE_TYPE_host_nonshm=1 -DACC_MEM_SHARED=0 -g -flto asyncwait-1.f90 gfortran-fsf-5.0: error: asyncwait-1.f90: No such file or directory [Jack-Howarths-Computer:~/testcase] howarth% gfortran-fsf-5.0 -fopenacc -DACC_DEVICE_TYPE_host_nonshm=1 -DACC_MEM_SHARED=0 -g -flto PR64672.f90 lto1: internal compiler error: in streamer_get_builtin_tree, at tree-streamer-in.c:1151 lto1: internal compiler error: Abort trap: 6 gfortran-fsf-5.0: internal compiler error: Abort trap: 6 (program lto1) lto-wrapper: fatal error: gfortran-fsf-5.0 terminated with signal 6 [Abort trap: 6] compilation terminated. collect2: fatal error: lto-wrapper returned 1 exit status compilation terminated. on x86_64-apple-darwin14.