[root@router_nnd lcdinfo-0.02]# gcc -O2 lcdinfo.c iolcd.c uptime.c systeminfo.c
uptime.c: In function `uptime':
uptime.c:38: warning: function returns address of local variable
systeminfo.c: In function `system_info':
systeminfo.c:18: warning: function returns address of local variable
/tmp/ccx6Kpoh.o(.text+0x152): In function `main_loop':
: undefined reference to `mem'
/tmp/ccx6Kpoh.o(.text+0x16a): In function `main_loop':
: undefined reference to `mem'
/tmp/ccx6Kpoh.o(.text+0x221): In function `main_loop':
: undefined reference to `swap'
/tmp/ccx6Kpoh.o(.text+0x239): In function `main_loop':
: undefined reference to `swap'
/tmp/ccx6Kpoh.o(.text+0x2f1): In function `main_loop':
: undefined reference to `cpu'
/tmp/ccx6Kpoh.o(.text+0x309): In function `main_loop':
: undefined reference to `cpu'
collect2: ld returned 1 exit status