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Gcc error when calling exit(-1) in a .c file

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# 1  
Old 01-10-2013
Gcc error when calling exit(-1) in a .c file
gcc is giving me an error when calling exit(-1) in xbuplot.c

Code:
cd ../pltlib; make xbuplot.o
make[1]: Entering directory `/media/ios120/chrisd/research/fast-zb/fast/pltlib'
gcc -c -o xbuplot.o xbuplot.c
xbuplot.c: In function ‘xbuinit_':
xbuplot.c:171:5: warning: incompatible implicit declaration of built-in function ‘exit' [enabled by default]
xbuplot.c:214:5: warning: incompatible implicit declaration of built-in function ‘exit' [enabled by default]
xbuplot.c:219:5: warning: incompatible implicit declaration of built-in function ‘exit' [enabled by default]
xbuplot.c:246:5: warning: incompatible implicit declaration of built-in function ‘exit' [enabled by default]
xbuplot.c: In function ‘xbuevent_':
xbuplot.c:694:9: error: a label can only be part of a statement and a declaration is not a statement
make[1]: *** [xbuplot.o] Error 1
make[1]: Leaving directory `/media/ios120/chrisd/research/fast-zb/fast/pltlib'
make: *** [../pltlib/xbuplot.o] Error 2

# 2  
Old 01-10-2013
You need to paste the source or its hard to understand what is happening there just from errors.
# 3  
Old 01-10-2013
Fixed by including

Code:
#include <stdlib.h>

# 4  
Old 01-10-2013
exit(-1) makes no sense. You're supposed to give it a number from 0 to 255. Anything other than 0 means error.
# 5  
Old 01-10-2013
Quote:
Originally Posted by Corona688
exit(-1) makes no sense. You're supposed to give it a number from 0 to 255. Anything other than 0 means error.
The use of exit(-1) seems to come from the Microsoft world. Unfortunately I now see it frequently in Linux source code. On Linux, exit(-1) returns 255, as under the hood GCC logically ANDs the -1 with 0xff.
# 6  
Old 01-11-2013
You need to include stdlib.h. The compiler is complaining that it hasn't seen a prototype for exit() before you used it.
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