protocol buffers - Makefile generic rule where target and prerequisite names differ -


i'm trying hybrid c/java build infrastructure making heavy use of protocol buffers set work correctly. while ant doing final java build, there lot of jni prerequisites being done in autoconf/make prior this, , ant being called makefile.

here's snippet of i'm trying working:

protodir = ../server/protos  proto_source = file_1.proto file_2.proto built_sources = $(proto_source:.proto=.java)  # tell make proto files vpath %.proto $(protodir)  # build java proto files src/appname/proto/%.java: %.proto     protoc --java_out=src/ --proto_path=`dirname $<` $<

the problem? protoc java removes underscores in file names, , hence %.java , %.proto file names don't match. build end working, rebuilds proto files (and hence depends on proto files) every time make called.

how can make %.java , %.proto can differ, or possible?

ok, found way using eval , defined macro.

protodir = ../server/protos protogendir = src/appname/proto/  proto_source = file_1.proto file_2.proto built_sources = $(subst _,,$(addprefix $(protogendir), $(proto_source:.proto=.java)))  # tell make proto files vpath %.proto $(protodir)  # build java proto files     define buildproto $(subst _,,$(addprefix $(protogendir), $(protoname:.proto=.java))): $(protoname)         protoc --java_out=src/ --proto_path=`dirname $$<` $$< endef  $(foreach protoname,$(proto_source),$(eval $(buildproto)))

inspired by: http://make.mad-scientist.net/the-eval-function/


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