Reputation: 25652
My makefile is as follows:
# The names of targets that can be built. Used in the list of valid targets when no target is specified, and when building all targets.
TARGETS := libAurora.a libAurora.so
# The place to put the finished binaries.
TARGET_DIRECTORY := ./Binaries
# The compiler to use to compile the source code into object files.
COMPILER := g++
# Used when compiling source files into object files.
COMPILER_OPTIONS := -I. -Wall -Wextra -fPIC -g -O4
# The archiver to use to consolidate the object files into one library.
ARCHIVER := ar
# Options to be passed to the archiver.
ARCHIVER_OPTIONS := -r -c -s
SOURCE_FILES := $(shell find Source -type f -name *.cpp)
OBJECT_FILES := $(SOURCE_FILES:.cpp=.o)
.PHONY: Default # The default target, which gives instructions, can be called regardless of whether or not files need to be updated.
.INTERMEDIATE: $(OBJECT_FILES) # Specifying the object files as intermediates deletes them automatically after the build process.
Default:
@echo "Please specify a target, or use \"All\" to build all targets. Valid targets:"
@echo "$(TARGETS)"
All: $(TARGETS)
lib%.a: $(OBJECT_FILES)
$(ARCHIVER) $(ARCHIVER_OPTIONS) $(TARGET_DIRECTORY)/$@ $(OBJECT_FILES)
lib%.so: $(OBJECT_FILES)
$(ARCHIVER) $(ARCHIVER_OPTIONS) $(TARGET_DIRECTORY)/$@ $(OBJECT_FILES)
%.o:
$(COMPILER) $(COMPILER_OPTIONS) -c -o $@ $*.cpp
As you can see, the .o
files are specified as intermediates via the .INTERMEDIATE
target. However, they are not deleted as expected after compilation finishes. Instead, they remain where they were created, cluttering up my source directory.
The strange thing is that it works perfectly on another machine. This leads me to believe it's a different version of make
, but man make
still shows it as the "GNU make utility."
Why won't make
delete the intermediate files?
EDIT: make -v
reports version 3.81.
EDIT: After manually deleting the .o
files (i.e., a clean slate), make All
produces the following output:
g++ -I. -Wall -Wextra -fPIC -g -O4 -c -o Source/File/File.o Source/File/File.cpp
g++ -I. -Wall -Wextra -fPIC -g -O4 -c -o Source/Timer/Timer.o Source/Timer/Timer.cpp
ar -r -c -s ./Binaries/libAurora.a Source/File/File.o Source/Timer/Timer.o
ar -r -c -s ./Binaries/libAurora.so Source/File/File.o Source/Timer/Timer.o
Upvotes: 5
Views: 6334
Reputation: 12705
So I copied this onto my machine and managed to reproduce both your problem and the solution.
Notice that in your .INTERMEDIATE
target, you use $(OBJECT_FILES)
as a prerequisite, but for the rule that makes .o
files you use a pattern rule. This confuses make
and it doesn't recognize that the both refer to the same thing. There are two solutions to this problem:
Change the prerequisites of .INTERMEDIATE
from $(OBJECT_FILES)
to %.o
, so it looks like
.INTERMEDIATE: %.o
Change the rule for making .o files to
$(OBJECT_FILES): $(SOURCE_FILES)
$(COMPILER) $(COMPILER_OPTIONS) -c $< -o $@
or something like it.
I recommend the first solution, as it's less likely to cause weird problems with compilation if you have several source files.
More info on the intermediate target can be found here.
Upvotes: 4
Reputation: 1870
Make sure, that the files are not there before you start building the project. The doc says clearly:
Therefore, an intermediate file which did not exist before make
also does not exist after make
.
If this is not the problem, you should post some debug output from make.
Upvotes: 4