通用Makefile忽略变量

Question

C++ project with a directory structure and Makefile styled after this blog post a simple c plus plus project structure . However, in the modified output from running makefile the variables do not seem to carry values through the compilation process.

edited (now working): Makefile

HOST_COMPILER := g++
SRCDIR := src
BUILDDIR := build
TARGET := bin/runner
SRCEXT := cc
SOURCES := $(shell find $(SRCDIR) -type f -name "*.$(SRCEXT)")
OBJECTS := $(patsubst $(SRCDIR)/%,$(BUILDDIR)/%,$(SOURCES:.$(SRCEXT)=.o))

# internal flags
CXXFLAGS := -std=c++11 -Wall -g -fopenmp 
MAGICKFLAGS := `Magick++-config --cxxflags --cppflags --ldflags --libs`

INCLUDES := -I/usr/include/ImageMagick-6 
LIBRARIES := -L/usr/local/lib/  -lMagick++-6.Q16 -lMagick++

$(TARGET) : $(OBJECTS)
    $(HOST_COMPILER) $^ -o $(TARGET) $(LIBRARIES)

$(BUILDDIR)/%.o : $(SRCDIR)/%.$(SRCEXT)
    @mkdir -p $(BUILDDIR)
    $(HOST_COMPILER) $(CXXFLAGS) $(MAGICKFLAGS) $(INCLUDES) -c -o $@ $<

clean:
    rm -r $(BUILDDIR) $(TARGET)

In retrospect "$(" is a common pair of symbols in this code which could be reversed for the error producing "($", except makefile doesn't inform you of such a misstype. So just a search on the document for "($" would have found the error.

Answer 1

There is a tiny problem in your makefile! Substitue this:

OBJECTS := $(patsubst ($SRCDIR)/%,$(BUILDDIR)/%,$(SOURCES:.$(SRCEXT)=.o))

With this:

OBJECTS := $(patsubst $(SRCDIR)/%,$(BUILDDIR)/%,$(SOURCES:.$(SRCEXT)=.o))