> > OK, now I have a real question: on my machine, I try the following.... > > > ... > So, ignoring this, I use the following in a random number > generator program and > get the following while compilation.... > > gcc -c -O3 -std=c99 -Wall -pedantic random.c > random.c: In function 'setseed': > random.c:35: warning: implicit declaration of function 'srandom' > random.c: In function 'runi': > random.c:48: warning: implicit declaration of function 'random' > > But I have included stdlib.h so what is the problem? > For whatever reason, the declare for srandom in /usr/include/stdlib.h is surrounded by the #ifdef #if defined __USE_SVID || defined __USE_XOPEN_EXTENDED || defined __USE_BSD For testing you could try setting one of these via -D__USE_BSD on your gcc command line. Being these preprocessor variables have leading double underscores, they are probably set when some other preprocessor variable is set. It would take a bit of looking to determine what causes these variables to be set. You can test which preprocessor variables are defined by default with: cpp -dM < /dev/null Hope this helps. Bob Styma
