Implicit rules in sub-directories

[Aditya Kher]

folks:

I have Makefiles spread over multiple sub-directories like given below.

Every time I make link_all target (and thus causing all pre-requsities  - lib*_ref_model.so to be re-evaluated,) I would like that the implicit rule "$objects" in all sub-directories A, B and C are run - if there is a modification of source files in any of these sub-directories.

What modifications do I need to the $pwd/Makefile?

 

aditya

 

--------------------------------------------------

$pwd/Makefile:

CC= g++

# Loader Flags
LDFLAGS=-melf_i386 -lstdc++ -lm

 

# C flags for compilation
CXXFLAGS= -pipe\
 -m32\
 -O\
 -g\
 +error+5 \
 -I$(Some_lib)/include \
  -I./

REF_SRC_DIR      = .

objects := $(patsubst %.cpp,%.o,$(wildcard $(REF_SRC_DIR)/*.cpp))

export

 

libref_model.so: $(objects)
  ${CC} -shared $^ -o $@

 

libA_ref_model.so:

 ${MAKE} --dir=A libA_ref_model.so

 

libB_ref_model.so:

 ${MAKE} --dir=B libB_ref_model.so

 

libC_ref_model.so:

 ${MAKE} --dir=C libC_ref_model.so

 

link_all:libref_model.so libA_ref_model.so libB_ref_model.so libC_ref_model.so

 some_compiler -lref_model -lA_ref_model -lB_ref_model -lC_ref_model -o some_executable

 ./some_executable

 

$pwd/A/Makefile

 

REF_SRC_DIR      = .

objects := $(patsubst %.cpp,%.o,$(wildcard $(REF_SRC_DIR)/*.cpp))
libA_ref_model.so: $(objects)
  ${CC} -shared $^ -o ../$@

 

$pwd/B/Makefile

 

REF_SRC_DIR      = .

objects := $(patsubst %.cpp,%.o,$(wildcard $(REF_SRC_DIR)/*.cpp))
libB_ref_model.so: $(objects)
  ${CC} -shared $^ -o ../$@

 

$pwd/C/Makefile

 

REF_SRC_DIR      = .

objects := $(patsubst %.cpp,%.o,$(wildcard $(REF_SRC_DIR)/*.cpp))
libC_ref_model.so: $(objects)
  ${CC} -shared $^ -o ../$@