cc -O2 -pipe -std=c99 -Wall -Wextra -Wno-unknown-pragmas -I/usr/local/include -I/usr/local/include/stlink -I/usr/include/libusb-1.0 -L/usr/local/lib -o swd2 swd2.c -lstlink
swd2.c:332:25: error: parameter 1 (‘start’) has incomplete type
  332 | elapsed(struct timespec start, struct timespec stop)
      |         ~~~~~~~~~~~~~~~~^~~~~
swd2.c:332:48: error: parameter 2 (‘stop’) has incomplete type
  332 | elapsed(struct timespec start, struct timespec stop)
      |                                ~~~~~~~~~~~~~~~~^~~~
swd2.c:332:1: error: return type is an incomplete type
  332 | elapsed(struct timespec start, struct timespec stop)
      | ^~~~~~~
swd2.c: In function ‘elapsed’:
swd2.c:335:10: error: variable ‘result’ has initializer but incomplete type
  335 |   struct timespec result = {
      |          ^~~~~~~~
swd2.c:336:5: error: ‘struct timespec’ has no member named ‘tv_sec’
  336 |    .tv_sec  = stop.tv_sec  - start.tv_sec  - 1,
      |     ^~~~~~
swd2.c:336:15: warning: excess elements in struct initializer
  336 |    .tv_sec  = stop.tv_sec  - start.tv_sec  - 1,
      |               ^~~~
swd2.c:336:15: note: (near initialization for ‘result’)
swd2.c:337:5: error: ‘struct timespec’ has no member named ‘tv_nsec’
  337 |    .tv_nsec = stop.tv_nsec - start.tv_nsec + 1000000000
      |     ^~~~~~~
swd2.c:337:15: warning: excess elements in struct initializer
  337 |    .tv_nsec = stop.tv_nsec - start.tv_nsec + 1000000000
      |               ^~~~
swd2.c:337:15: note: (near initialization for ‘result’)
swd2.c:335:19: error: storage size of ‘result’ isn’t known
  335 |   struct timespec result = {
      |                   ^~~~~~
swd2.c:339:10: warning: ‘return’ with a value, in function returning void [-Wreturn-type]
  339 |   return result;
      |          ^~~~~~
swd2.c:332:1: note: declared here
  332 | elapsed(struct timespec start, struct timespec stop)
      | ^~~~~~~
swd2.c:335:19: warning: unused variable ‘result’ [-Wunused-variable]
  335 |   struct timespec result = {
      |                   ^~~~~~
swd2.c:341:17: error: variable ‘result’ has initializer but incomplete type
  341 |          struct timespec result = {
      |                 ^~~~~~~~
swd2.c:342:5: error: ‘struct timespec’ has no member named ‘tv_sec’
  342 |    .tv_sec  = stop.tv_sec  - start.tv_sec,
      |     ^~~~~~
swd2.c:342:15: warning: excess elements in struct initializer
  342 |    .tv_sec  = stop.tv_sec  - start.tv_sec,
      |               ^~~~
swd2.c:342:15: note: (near initialization for ‘result’)
swd2.c:343:12: error: ‘struct timespec’ has no member named ‘tv_nsec’
  343 |           .tv_nsec = stop.tv_nsec - start.tv_nsec
      |            ^~~~~~~
swd2.c:343:22: warning: excess elements in struct initializer
  343 |           .tv_nsec = stop.tv_nsec - start.tv_nsec
      |                      ^~~~
swd2.c:343:22: note: (near initialization for ‘result’)
swd2.c:341:26: error: storage size of ‘result’ isn’t known
  341 |          struct timespec result = {
      |                          ^~~~~~
swd2.c:345:10: warning: ‘return’ with a value, in function returning void [-Wreturn-type]
  345 |   return result;
      |          ^~~~~~
swd2.c:332:1: note: declared here
  332 | elapsed(struct timespec start, struct timespec stop)
      | ^~~~~~~
swd2.c:341:26: warning: unused variable ‘result’ [-Wunused-variable]
  341 |          struct timespec result = {
      |                          ^~~~~~
swd2.c:332:25: warning: unused parameter ‘start’ [-Wunused-parameter]
  332 | elapsed(struct timespec start, struct timespec stop)
      |         ~~~~~~~~~~~~~~~~^~~~~
swd2.c:332:48: warning: unused parameter ‘stop’ [-Wunused-parameter]
  332 | elapsed(struct timespec start, struct timespec stop)
      |                                ~~~~~~~~~~~~~~~~^~~~
swd2.c: At top level:
swd2.c:370:1: error: return type is an incomplete type
  370 | get_time(void)
      | ^~~~~~~~
swd2.c: In function ‘get_time’:
swd2.c:372:18: error: storage size of ‘ts’ isn’t known
  372 |  struct timespec ts;
      |                  ^~
swd2.c:375:2: warning: implicit declaration of function ‘clock_gettime’ [-Wimplicit-function-declaration]
  375 |  clock_gettime(CLOCK_MONOTONIC_FAST, &ts);
      |  ^~~~~~~~~~~~~
swd2.c:22:30: error: ‘CLOCK_MONOTONIC’ undeclared (first use in this function); did you mean ‘CLOCK_MONOTONIC_FAST’?
   22 | #define CLOCK_MONOTONIC_FAST CLOCK_MONOTONIC
      |                              ^~~~~~~~~~~~~~~
swd2.c:375:16: note: in expansion of macro ‘CLOCK_MONOTONIC_FAST’
  375 |  clock_gettime(CLOCK_MONOTONIC_FAST, &ts);
      |                ^~~~~~~~~~~~~~~~~~~~
swd2.c:22:30: note: each undeclared identifier is reported only once for each function it appears in
   22 | #define CLOCK_MONOTONIC_FAST CLOCK_MONOTONIC
      |                              ^~~~~~~~~~~~~~~
swd2.c:375:16: note: in expansion of macro ‘CLOCK_MONOTONIC_FAST’
  375 |  clock_gettime(CLOCK_MONOTONIC_FAST, &ts);
      |                ^~~~~~~~~~~~~~~~~~~~
swd2.c:377:9: warning: ‘return’ with a value, in function returning void [-Wreturn-type]
  377 |  return ts;
      |         ^~
swd2.c:370:1: note: declared here
  370 | get_time(void)
      | ^~~~~~~~
swd2.c:372:18: warning: unused variable ‘ts’ [-Wunused-variable]
  372 |  struct timespec ts;
      |                  ^~
swd2.c: In function ‘stdin_file_type_or_die’:
swd2.c:411:40: error: ‘S_IFMT’ undeclared (first use in this function)
  411 |  const mode_t file_type = sb.st_mode & S_IFMT;
      |                                        ^~~~~~
swd2.c:413:8: error: ‘S_IFIFO’ undeclared (first use in this function); did you mean ‘S_ISFIFO’?
  413 |   case S_IFIFO:
      |        ^~~~~~~
      |        S_ISFIFO
swd2.c:417:8: error: ‘S_IFCHR’ undeclared (first use in this function); did you mean ‘S_ISCHR’?
  417 |   case S_IFCHR:
      |        ^~~~~~~
      |        S_ISCHR
swd2.c:423:8: error: ‘S_IFREG’ undeclared (first use in this function); did you mean ‘S_ISREG’?
  423 |   case S_IFREG:
      |        ^~~~~~~
      |        S_ISREG
swd2.c: In function ‘install_signal_handlers’:
swd2.c:454:19: error: array type has incomplete element type ‘struct sigaction’
  454 |  struct sigaction action[1] = {{ .sa_handler = handler_int }};
      |                   ^~~~~~
swd2.c:454:34: error: field name not in record or union initializer
  454 |  struct sigaction action[1] = {{ .sa_handler = handler_int }};
      |                                  ^
swd2.c:454:34: note: (near initialization for ‘action’)
swd2.c:455:2: warning: implicit declaration of function ‘sigemptyset’ [-Wimplicit-function-declaration]
  455 |  sigemptyset(&action->sa_mask);
      |  ^~~~~~~~~~~
swd2.c:456:2: warning: implicit declaration of function ‘sigaction’ [-Wimplicit-function-declaration]
  456 |  sigaction(SIGINT, action, NULL);
      |  ^~~~~~~~~
swd2.c:454:19: warning: unused variable ‘action’ [-Wunused-variable]
  454 |  struct sigaction action[1] = {{ .sa_handler = handler_int }};
      |                   ^~~~~~
swd2.c: In function ‘main’:
swd2.c:501:9: error: variable ‘last_active’ has initializer but incomplete type
  501 |  struct timespec last_active = get_time();
      |         ^~~~~~~~
swd2.c:501:18: error: storage size of ‘last_active’ isn’t known
  501 |  struct timespec last_active = get_time();
      |                  ^~~~~~~~~~~
swd2.c:507:10: error: variable ‘now’ has initializer but incomplete type
  507 |   struct timespec now = get_time();
      |          ^~~~~~~~
swd2.c:507:19: error: storage size of ‘now’ isn’t known
  507 |   struct timespec now = get_time();
      |                   ^~~
swd2.c:524:11: error: variable ‘diff’ has initializer but incomplete type
  524 |    struct timespec diff = elapsed(last_active, now);
      |           ^~~~~~~~
swd2.c:524:20: error: storage size of ‘diff’ isn’t known
  524 |    struct timespec diff = elapsed(last_active, now);
      |                    ^~~~
swd2.c:526:5: warning: implicit declaration of function ‘usleep’; did you mean ‘sleep’? [-Wimplicit-function-declaration]
  526 |     usleep(10*1000);
      |     ^~~~~~
      |     sleep
swd2.c:524:20: warning: unused variable ‘diff’ [-Wunused-variable]
  524 |    struct timespec diff = elapsed(last_active, now);
      |                    ^~~~
swd2.c:507:19: warning: unused variable ‘now’ [-Wunused-variable]
  507 |   struct timespec now = get_time();
      |                   ^~~
swd2.c:501:18: warning: unused variable ‘last_active’ [-Wunused-variable]
  501 |  struct timespec last_active = get_time();
      |                  ^~~~~~~~~~~
make: *** [Makefile:15: swd2] Error 1
[3]+  Done                    emacs Makefile