gnu make - Makefile dependencies variable -

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i have simple makefile. when i'm not using variable in dependencies list works fine. otherwise gives fallowing error:

make: *** no rule make target 'ext/configxml.o', needed 'libledrgb-jni.so'.  stop.

furthermore when 

    make print-led-cfg-src led-cfg-src = ../led-cfg/src

so value set properly, altough if explicitly add rule file:

ext/configxml.o: $(led-cfg-src)/%.cc  @echo 'building file: $<' @${cxx} $(cxxflags) -c -o "$@" "$<"

it looks problem led-cfg-src source file:

 make ext/configxml.o make: *** no rule make target '/configxml.cc', needed 'ext/configxml.o'.  stop.

but file exists: 

   make list ls -la ../led-cfg/src total 340 drwxrwxr-x  2 gigi gigi  4096 lip 27 13:10 . drwxrwxr-x 12 gigi gigi  4096 lip 28 10:08 .. -rw-rw-r--  1 gigi gigi 11918 lip 28 09:54 configxml.cc -rw-rw-r--  1 gigi gigi  2891 lip 27 13:17 configxml.h

here's source makefile:

    extobjs = ext/configxml.o ext/packet.o ext/tinyxml2.o ext/crypt.o ext/rozkaz.o     led-cfg-src := ../led-cfg/src/      includes := -i$(led-cfg-src)     cxxflags := $(includes)     library := libledrgb-jni.so      cxxflags := $(includes) -fpic -std=c++14      all: dirs $(library)      $(library): $(objfiles) $(extobjs)         $(cxx) -shared -o $@ $^        ext/%.o: $(led-cfg-src)/%.cc          @echo 'building file: $<'         @${cxx} $(cxxflags) -c -o "$@" "$<"       clean:         rm -rf $(extobjs)      list:         ls -la $(led-cfg-src)      print-%  : ; @echo $* = $($*)       .phony: clean dirs

i'm using gnu make 4.1

shot in dark. @ least in makefile listing have posted, there redundant undesired whitespace in definition of led-cfg-src variable:

led-cfg-src := ../led-cfg/src/<there-is-reduntant-whitespace-here>

that means, when variable expanded in rule definition later, make see ../led-cfg/src/ %.cc (two words, $< = ../led-cfg/src/, , %.cc being additional dependency) instead of expected ../led-cfg/src/%.cc.

you should activate display of non-printable characters in editor, since make in places extremely picky whitespaces: chooses strip automatically, keeps. here: make had stipped whitespace in front of ../led-cfg/src/, kept 1 @ end.


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