when I compile my code,I write " gcc -g -Wall dene2 dene2.c" in the console. then gcc emits some things on the screen. I havenot understand what it is and I cannot consturct any meaning. I have sorted in google but I havenot seen any information about thing which gcc
emits on screen I am not saying examining all of the things which is at below,just show me "how to
catch fish". (I couldnot find meaningful title ,for that reason ,sorry,)

dene2: In function `_start':
    /build/buildd/eglibc-2.10.1/csu/../sysdeps/i386/elf/start.S:65: multiple 
       definition of `_start'
   /usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib/crt1.o:/build/buildd/eglibc-2.10.1
      /csu/../sysdeps/i386/elf/start.S:65: first defined here
dene2:(.rodata+0x0): multiple definition of `_fp_hw'
   /usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib/crt1.o:(.rodata+0x0): first 
     defined here
dene2: In function `_fini':
   (.fini+0x0): multiple definition of `_fini'
   /usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib/crti.o:(.fini+0x0): first defined 
      here
dene2:(.rodata+0x4): multiple definition of `_IO_stdin_used'
   /usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib/crt1.o:(.rodata.cst4+0x0): first 
     defined here
dene2: In function `__data_start':
 (.data+0x0): multiple definition of `__data_start'
   /usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib/crt1.o:(.data+0x0): first defined 
     here
dene2: In function `__data_start':
 (.data+0x4): multiple definition of `__dso_handle'
  /usr/lib/gcc/i486-linux-gnu/4.4.1/crtbegin.o:(.data+0x0): first defined here
dene2: In function `_init':
 (.init+0x0): multiple definition of `_init'
  /usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib/crti.o:(.init+0x0): first defined 
       here
  /tmp/ccMlGkkV.o: In function `main':
  /home/fatih/Desktop/dene2.c:5: multiple definition of `main'
dene2:(.text+0xb4): first defined here
  /usr/lib/gcc/i486-linux-gnu/4.4.1/crtend.o:(.dtors+0x0): multiple definition of 
     `__DTOR_END__'
dene2:(.dtors+0x4): first defined here
  collect2: ld returned 1 exit status