Creating a Makefile, help

[Lina_inverse]

Give a makefile (doesn't have to be a separate file - just what the contents would be) that would generate the application described below. Be sure each generated file has its own rule.

The first tool is flex, which takes a file called spec.l and generates a file called lex.yy.c. Another tool called bison expects a file calledspec.y and will generate the file spec.tab.c. If bison is called using the directives -vd, it will also generate a file called spec.tab.h (which is needed when compiling lex.yy.c). The two C files can be compiled into object files and then linked together with the yacc (-ly) and lex (-ll) libraries to generate the compiler (a.out.
The makefile you describe must generate the following commands if you were starting just with spec.l and spec.y:

flex spec.l
bison -vd spec.y
gcc -c lex.yy.c
gcc -c spec.tab.c
gcc spec.tab.o lex.yy.o -ly -ll

[Salem]

A makefile entry looks like this

target : dependency
        rule

Note that it is a TAB which indents rule, not spaces.

So for example

lex.yy.c : spec.l
        flex spec.l

[Lina_inverse]

can u tell me if this is correct?

compiler: spec.tab.o lex.yy.o
gcc spec.tab.o lex.yy.o -ly –ll
lex.yy.c: spec.l
flex spec.l
spec.tab.c: spec.y
bison -vd spec.y
spec.tab.o: spec.tab.c
gcc -c spec.tab.c
lex.yy.o: lex.yy.c spec.tab.h
gcc –c lex.yy.c
clean:
rm –f *.c *.o a.out

[Salem]

> can u tell me if this is correct?
Hey, they're your files on your system, why don't you try it for yourself.

If you type in say
touch spec.y
that will update the modification date of the file, to make it seem like you edited the file.

Then you type
make
If you see all the expected things happening (bison + two gcc), then I'd say it's working.