How to build an executable file from 2 sources using make?

Question

C++ / C#

In general, two files with the source code main_0.c main_1.c and the third header file header.h in which all the prototypes and global variables.
Here is the text of the makefile:

/home/tr/tr: /home/tr/main_0.o /home/tr/main_1.o
        cc  -o /home/tr/main_0.o /home/tr/main_1.o
/home/tr/main_0.o: /home/tr/main_0.c /home/tr/header.h               
        cc -c /home/tr/main_0.c                  
/home/tr/main_1.o: /home/tr/main_1.c /home/tr/header.h
        cc -c /home/tr/main_1.c

When "make -f makefile" is called, the following output appears:
make -f /home/tr/tr_make
cc -c /home/tr/main_0.c
cc -o /home/tr/main_0.o /home/tr/main_1. o
/usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
/home/tr/tr_make:2: error executing recipe for target '/home/tr/tr'
make: *** [/home/tr/tr] Error 1

What am I doing wrong? if I just compile the sources by typing "gcc ...." in the terminal, everything compiles and runs fine. I have already spent a lot of time on the makefile script, and the sequential assembly of two object files is not the pinnacle of fame)) What's wrong? Suggest, please!

Answer 1

As you have already been answered in a comment, you simply didn't provide an option for -o.
In general, you should never use absolute paths in a Makefile.
And yet, if you change your header.h, then make will not know about it.
Compilers have special options to generate .c file dependencies from headers.
Here is a generic Makefile for simple projects:

PROJECT = tr
SOURCES = main_0.c main_1.c
OBJECTS = $(SOURCES:.c=.o)
HEADER_DEPS = $(SOURCES:.c=.d)

.PHONY: all

all: $(PROJECT)

$(PROJECT): $(OBJECTS)
  $(CC) $(CFLAGS) $^ -o [email protected]

-include $(HEADER_DEPS)

%.o: %.c
  $(CC) $(CFLAGS) -MM -MT [email protected] -MF $(patsubst %.o,%.d,[email protected]) $<
  $(CC) $(CFLAGS) -c $< -o [email protected]

.PHONY: clean

clean:
  $(RM) $(PROJECT) $(OBJECTS) $(HEADER_DEPS)