Found the following significant warnings:
  working_test_norm_c.cpp:1785:13: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1785:20: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:4: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:6: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:10: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:21: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:24: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:26: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:30: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:32: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:34: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:36: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:38: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:40: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:42: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:46: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:48: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:53: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:56: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:62: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:64: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:66: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:68: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:70: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:72: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:82: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:84: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:86: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:88: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:90: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:92: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:94: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:96: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:98: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:102: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:104: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:115: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:118: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:1905:123: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:2999:10: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  working_test_norm_c.cpp:2999:17: warning: invalid UTF-8 in comment [-Winvalid-utf8]
See ‘/data/gannet/ripley/R/packages/tests-clang/adpss.Rcheck/00install.out’ for details.