Why make isn't running linker

[sharan basappa]

I seem to be having trouble creating executable from object file using 
implicit rule.

This is the chunk of make file ..

all:
include dir1/dir1.mk

objects  := $(subst .c,.o,$(sources));

.PHONY : all

all :  main

main : main.o $(objects)

.PHONY : clean_all

I am expecting make to link object files and main.o from the rule
main : main.o $(objects) and create main executable.
Make seems to process every rule as expected but does not run
the linker for this implicit rule ..

The output from make with --debug=verbose option is below

Reading makefiles...
Reading makefile `SmallPrjMain.mk'...
Reading makefile `dir1/dir1.mk' (search path) (no ~ expansion)...
Updating goal targets....
Considering target file `all'.
File `all' does not exist.
 Considering target file `main'.
  File `main' does not exist.
   Considering target file `main.o'.
    File `main.o' does not exist.
     Considering target file `main.c'.
      Finished prerequisites of target file `main.c'.
     No need to remake target `main.c'.
    Finished prerequisites of target file `main.o'.
   Must remake target `main.o'.
cc  -Ilib -Iinclude  -c -o main.o main.c
   Successfully remade target file `main.o'.
   Considering target file `dir1/print1dir1.o'.
    File `dir1/print1dir1.o' does not exist.
     Considering target file `dir1/print1dir1.c'.
      Finished prerequisites of target file `dir1/print1dir1.c'.
     No need to remake target `dir1/print1dir1.c'.
    Finished prerequisites of target file `dir1/print1dir1.o'.
   Must remake target `dir1/print1dir1.o'.
cc  -Ilib -Iinclude  -c -o dir1/print1dir1.o dir1/print1dir1.c
   Successfully remade target file `dir1/print1dir1.o'.
   Considering target file `dir1/print2dir1.o'.
    File `dir1/print2dir1.o' does not exist.
     Considering target file `dir1/print2dir1.c'.
      Finished prerequisites of target file `dir1/print2dir1.c'.
     No need to remake target `dir1/print2dir1.c'.
    Finished prerequisites of target file `dir1/print2dir1.o'.
   Must remake target `dir1/print2dir1.o'.
cc  -Ilib -Iinclude  -c -o dir1/print2dir1.o dir1/print2dir1.c
   Successfully remade target file `dir1/print2dir1.o'.
  Finished prerequisites of target file `main'.
 Must remake target `main'.
 Successfully remade target file `main'.
Finished prerequisites of target file `all'.
Must remake target `all'.
Successfully remade target file `all'.

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