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# cc test.c
cc1: internal compiler error: Illegal instruction
no stack trace because unwind library not available
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://www.NetBSD.org/support/send-pr.html> for instructions.
# c++ test.c
# ./a.out
Hello World.
#

なかなか限定的すぎませんか