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bench git:(master) make
rm -f bench *.o
cc test.c -c -o test.o -std=c99 -Wall -Wextra  -lrt
In file included from test.c:4:0:
bench.h: In function ‘wall’:
bench.h:51:19: error: storage size of ‘tp’ isn’t known
   struct timespec tp;
                   ^
bench.h:52:3: warning: implicit declaration of function ‘clock_gettime’ [-Wimplicit-function-declaration]
   clock_gettime(CLOCK_SUITABLE, &tp);
   ^
bench.h:46:26: error: ‘CLOCK_MONOTONIC’ undeclared (first use in this function)
 #  define CLOCK_SUITABLE CLOCK_MONOTONIC
                          ^
bench.h:52:17: note: in expansion of macro ‘CLOCK_SUITABLE’
   clock_gettime(CLOCK_SUITABLE, &tp);
                 ^
bench.h:46:26: note: each undeclared identifier is reported only once for each function it appears in
 #  define CLOCK_SUITABLE CLOCK_MONOTONIC
                          ^
bench.h:52:17: note: in expansion of macro ‘CLOCK_SUITABLE’
   clock_gettime(CLOCK_SUITABLE, &tp);
                 ^
bench.h:51:19: warning: unused variable ‘tp’ [-Wunused-variable]
   struct timespec tp;
                   ^
bench.h: In function ‘cpu’:
bench.h:58:19: error: storage size of ‘tp’ isn’t known
   struct timespec tp;
                   ^
bench.h:59:17: error: ‘CLOCK_PROCESS_CPUTIME_ID’ undeclared (first use in this function)
   clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &tp);
                 ^
bench.h:58:19: warning: unused variable ‘tp’ [-Wunused-variable]
   struct timespec tp;
                   ^
bench.h: In function ‘wall’:
bench.h:54:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
bench.h: In function ‘cpu’:
bench.h:61:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
Makefile:20: recipe for target 'test.o' failed
make: *** [test.o] Error 1