warning - ubunutu 18-04

[pavel-pimenov]

~/src/byte-unixbench-master/UnixBench$ ./Run
gcc -o pgms/arithoh -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME -Darithoh src/arith.c
gcc -o pgms/register -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME -Ddatum='register int' src/arith.c
gcc -o pgms/short -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME -Ddatum=short src/arith.c
gcc -o pgms/int -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME -Ddatum=int src/arith.c
gcc -o pgms/long -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME -Ddatum=long src/arith.c
gcc -o pgms/float -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME -Ddatum=float src/arith.c
gcc -o pgms/double -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME -Ddatum=double src/arith.c
gcc -o pgms/hanoi -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME src/hanoi.c
gcc -o pgms/syscall -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME src/syscall.c
gcc -o pgms/context1 -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME src/context1.c
gcc -o pgms/pipe -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME src/pipe.c
src/pipe.c: In function ‘main’:
src/pipe.c:52:2: warning: ignoring return value of ‘pipe’, declared with attribute warn_unused_result [-Wunused-result]
pipe(pvec);
^~~~~~~~~~
gcc -o pgms/spawn -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME src/spawn.c
gcc -o pgms/execl -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME src/execl.c
In file included from src/execl.c:34:0:
src/big.c: In function ‘dummy’:
src/big.c:109:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result]
freopen("masterlog.00", "a", stderr);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/big.c:197:6: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result]
freopen(logname, "w", stderr);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/big.c:221:3: warning: ignoring return value of ‘dup’, declared with attribute warn_unused_result [-Wunused-result]
dup(pvec[0]);
^~~~~~~~~~~~
src/big.c:225:6: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result]
freopen(logname, "w", stderr);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/big.c:318:4: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
write(fcopy, cp->line, p - cp->line + 1);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/big.c:196:34: warning: ‘%02d’ directive writing between 2 and 10 bytes into a region of size 5 [-Wformat-overflow=]
sprintf(logname, "masterlog.%02d", firstuser/MAXCHILD);
^~~~
src/big.c:196:23: note: directive argument in the range [-178956970, 178956970]
sprintf(logname, "masterlog.%02d", firstuser/MAXCHILD);
^~~~~~~~~~~~~~~~
In file included from /usr/include/stdio.h:862:0,
from src/execl.c:25:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:33:10: note: ‘__builtin___sprintf_chk’ output between 13 and 21 bytes into a destination of size 15
return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
__bos (__s), __fmt, __va_arg_pack ());
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
gcc -o pgms/dhry2 -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME -DHZ= ./src/dhry_1.c ./src/dhry_2.c
gcc -o pgms/dhry2reg -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME -DHZ= -DREG=register ./src/dhry_1.c ./src/dhry_2.c
gcc -o pgms/looper -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME src/looper.c
gcc -o pgms/fstime -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME src/fstime.c
gcc -o pgms/whetstone-double -Wall -pedantic -O3 -ffast-math -march=native -mtune=native -I ./src -DTIME -DDP -DGTODay -DUNIXBENCH src/whets.c -lm

[sfx2000]

That's just gcc warnings - nothing is wrong here...