Flat object file directory structure output with GNU Make

Question

I have a C++ small project using GNU Make. I\'d like to be able to turn the following source files:

src/
  a.cpp
  b/
    b.cpp
  c/
    c.cpp

Answer 1

This is for Win32 mingw32-make. it's works. The most important part is

-mkdir $(patsubst %/,%,$(dir $@))

for win32. We need to strip the trailling / for win32.

GENERATED_DIRS = a b

# Dependency generator function
mkdir_deps =$(foreach dir,$(GENERATED_DIRS),$(dir)/.mkdir.done)

# Target rule to create the generated dependency.
# And create the .mkdir.done file for stop continuous recreate the dir
%/.mkdir.done: # target rule
    -mkdir $(patsubst %/,%,$(dir $@))
    echo $(patsubst %/,%,$(dir $@)) >$@

all: $(mkdir_deps)
    @echo Begin

clean:
    @echo Cleaning