Mix multiple objects files with gcc which have no main function

i try to mix files . For example , if i have file1.o and have file2.o , all of them don't have main function , then le1_file2.o is the result of those files . So i have used 2 things :

Using of linker and makefile:

linker.ld:

OUTPUT_FORMAT(elf32-i386)

SECTIONS
{
    .text : {*(.text)}
    .data : {*(.data)}
    .rodata : {*(.rodata)}
    .bss :
    {
        *(COMMON)
        *(.bss)
    }    
    end = .; _end = .; __end = .;
}

Makefile:

CC =gcc
OBJ = file1.o file2.o

all : file1_file2.o

file1_file2.o: $(OBJ)
    ld -m elf_i386 --oformat=binary -Tlinker.ld $^ -o $@

%.o : %.c
    @$(CC) -o $@ -c $< -m32 -g -ffreestanding -fno-PIC -fno-stack-protector -Werror

Using only a makefile:

Makefile:

 CC =gcc
 OBJ = file1.o file2.o

 all : file1_file2.o

 file1_file2.o: $(OBJ)
     $(CC) $^ -o $@ -m32 -g -ffreestanding -fno-PIC -fno-stack-protector -Werror

 %.o : %.c
     @$(CC) -o $@ -c $< -m32 -g -ffreestanding -fno-PIC -fno-stack-protector -Werror