Found the following significant warnings:
  ./arch.h:135:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:136:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:137:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:138:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:139:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:140:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:141:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:142:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:143:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:144:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:145:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:146:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:147:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:148:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:149:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./arch.h:150:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  arch.c:174:34: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  arch.c:212:25: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  arch.c:214:23: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  arch.c:242:35: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  arch.c:419:35: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  arch.c:437:35: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  ./parser.h:116:35: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  arch_sub.c:416:36: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  arch_sub.c:480:32: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  bgraph_bipart_st.c:367:66: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  common_memory.c:452:8: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  common_memory.c:458:8: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  hgraph_order_st.c:310:66: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  hmesh_order_st.c:290:66: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  kgraph_map_st.c:386:66: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  library_arch.c:97:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  library_geom.c:81:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  library_graph.c:85:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  library_mapping.c:73:17: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  library_memory.c:83:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  library_mesh.c:79:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  library_order.c:73:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  library_random.c:114:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  library_random_f.c:83:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  library_strat.c:73:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mesh_coarsen.c:71:62: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mesh_coarsen.c:167:29: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  parser_ll.l:213:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  parser_ll.l:226:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  vgraph_separate_st.c:328:66: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  vmesh_separate_st.c:284:66: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  ./wgraph_part_fm.h:149:49: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  wgraph_part_fm.c:909:20: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  wgraph_part_st.c:272:66: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  main_esmumps.c:70:1: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
  ./mumps_common.h:40:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_common.h:47:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_common.h:49:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_common.h:57:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_common.h:59:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_common.h:67:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_common.h:69:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_common.h:77:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_common.c:23:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_common.c:33:24: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_common.c:38:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_common.c:48:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_common.c:53:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_common.c:63:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_common.c:68:19: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_common.c:78:25: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_io_basic.h:154:39: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_io_err.h:36:33: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_io_err.h:37:36: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_io_err.h:38:31: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_io_basic.c:658:39: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_io.h:136:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_io_thread.h:72:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_io.c:433:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_io_thread.c:243:40: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_io_err.c:45:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_io_err.c:53:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_io_err.c:61:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_io_err.c:67:26: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_io_err.c:73:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_numa.c:15:22: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_save_restore_C.h:29:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_save_restore_C.c:46:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_config_file_C.h:21:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_config_file_C.c:21:27: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./mumps_thread_affinity.h:21:29: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_thread_affinity.c:17:29: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_c.c:216:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  mumps_c.c:230:23: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  ./dmumps_gpu.h:18:34: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  dmumps_gpu.c:19:34: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
See '/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/rmumps.Rcheck/00install.out' for details.