code put into a .comp file in src/hal/componets

component rand1;
option userspace;

pin out float out;
license "GPL"; // indicates GPL v2 or later
;;
#include <unistd.h>

void user_mainloop(void) {
    while(1) {
        usleep(1000);
        FOR_ALL_INSTS() out = drand48();
    }
}

compiler :

linuxcnc@bbb:~/linuxcnc/src$ make
Reading 183/183 dependency files
Done reading dependencies
Reading 0/0 realtime dependency files
Done reading realtime dependencies
make: Entering directory `/home/linuxcnc/linuxcnc/src'
Making modules for flavor posix
Reading 193/193 dependency files
Done reading dependencies
Reading 0/185 realtime dependency files
Done reading realtime dependencies
make[1]: Entering directory `/home/linuxcnc/linuxcnc/src'
Compiling realtime halcomp-srcs/hal/components/jgreadadc.c
halcomp-srcs/hal/components/jgreadadc.c: In function ‘main’:
halcomp-srcs/hal/components/jgreadadc.c:93:8: error: expected ‘)’ before ‘;’ token
halcomp-srcs/hal/components/jgreadadc.c:95:1: error: section attribute cannot be specified for local variables
halcomp-srcs/hal/components/jgreadadc.c:95:1: warning: unused variable ‘rtapi_exported_rtapi_app_exit’ [-Wunused-variable]
make[1]: *** [objects/posix/halcomp-srcs/hal/components/jgreadadc.o] Error 1
make[1]: Leaving directory `/home/linuxcnc/linuxcnc/src'
Making modules for flavor rt-preempt
Reading 193/193 dependency files
Done reading dependencies
Reading 0/185 realtime dependency files
Done reading realtime dependencies
make[1]: Entering directory `/home/linuxcnc/linuxcnc/src'
Compiling realtime halcomp-srcs/hal/components/jgreadadc.c
halcomp-srcs/hal/components/jgreadadc.c: In function ‘main’:
halcomp-srcs/hal/components/jgreadadc.c:93:8: error: expected ‘)’ before ‘;’ token
halcomp-srcs/hal/components/jgreadadc.c:95:1: error: section attribute cannot be specified for local variables
halcomp-srcs/hal/components/jgreadadc.c:95:1: warning: unused variable ‘rtapi_exported_rtapi_app_exit’ [-Wunused-variable]
make[1]: *** [objects/rt-preempt/halcomp-srcs/hal/components/jgreadadc.o] Error 1
make[1]: Leaving directory `/home/linuxcnc/linuxcnc/src'
Making modules for flavor xenomai
Reading 193/193 dependency files
Done reading dependencies
Reading 0/185 realtime dependency files
Done reading realtime dependencies
make[1]: Entering directory `/home/linuxcnc/linuxcnc/src'
Compiling realtime halcomp-srcs/hal/components/jgreadadc.c
halcomp-srcs/hal/components/jgreadadc.c: In function ‘main’:
halcomp-srcs/hal/components/jgreadadc.c:93:8: error: expected ‘)’ before ‘;’ token
halcomp-srcs/hal/components/jgreadadc.c:95:1: error: section attribute cannot be specified for local variables
halcomp-srcs/hal/components/jgreadadc.c:95:1: warning: unused variable ‘rtapi_exported_rtapi_app_exit’ [-Wunused-variable]
make[1]: *** [objects/xenomai/halcomp-srcs/hal/components/jgreadadc.o] Error 1
make[1]: Leaving directory `/home/linuxcnc/linuxcnc/src'
make: *** [modules] Error 2
make: Leaving directory `/home/linuxcnc/linuxcnc/src'
linuxcnc@bbb:~/linuxcnc/src$