Hiding the removal of intermediate files using Make - recursion

I use intermediate files in my Makefile, however make prints out the rm command that it uses to delete them all afterwards. How do I hide this print statement?

The make manual says that targets marked .SECONDARY will behave as .INTERMEDIATE but won't be automatically deleted. You could mark all the intermediate targets as secondary, and then remove the files yourself, something like
OBJECTS=foo.o bar.o
all:foo bar
#rm -f $(OBJECTS)
.SECONDARY: $(OBJECTS)
should do.

Related

How to make a single makefile that applies the same command to sub-directories?

For clarity, I am running this on windows with GnuWin32 make.
I have a set of directories with markdown files in at several different levels - theoretically they could be in the branch nodes, but I think currently they are only in the leaf nodes. I have a set of pandoc/LaTeX commands to run to turn the markdown files into PDFs - and obviously only want to recreate the PDFs if the markdown file has been updated, so a makefile seems appropriate.
What I would like is a single makefile in the root, which iterates over any and all sub-directories (to any depth) and applies the make rule I'll specify for running pandoc.
From what I've been able to find, recursive makefiles require you to have a makefile in each sub-directory (which seems like an administrative overhead that I would like to avoid) and/or require you to list out all the sub-directories at the start of the makefile (again, would prefer to avoid this).
Theoretical folder structure:
root
|-make
|-Folder AB
| |-File1.md
| \-File2.md
|-Folder C
| \-File3.md
\-Folder D
|-Folder E
| \-File4.md
|-Folder F
\-File5.md
How do I write a makefile to deal with this situation?
Here is a small set of Makefile rules that hopefuly would get you going
%.pdf : %.md
pandoc -o $# --pdf-engine=xelatex $^
PDF_FILES=FolderA/File1.pdf FolderA/File2.pdf \
FolderC/File3.pdf FolderD/FolderE/File4.pdf FolderD/FolderF/File5.pdf
all: ${PDF_FILES}
Let me explain what is going on here. First we have a pattern rule that tells make how to convert a Markdown file to a PDF file. The --pdf-engine=xelatex option is here just for the purpose of illustration.
Then we need to tell Make which files to consider. We put the names together in a single variable PDF_FILES. This value for this variable can be build via a separate scripts that scans all subdirectories for .md files.
Note that one has to be extra careful if filenames or directory names contain spaces.
Then we ask Make to check if any of the PDF_FILES should be updated.
If you have other targets in your makefile, make sure that all is the first non-pattern target, or call make as make all
Updating the Makefile
If shell functions works for you and basic utilities such as sed and find are available, you could make your makefile dynamic with a single line.
%.pdf : %.md
pandoc -o $# --pdf-engine=xelatex $^
PDF_FILES:=$(shell find -name "*.md" | xargs echo | sed 's/\.md/\.pdf/g' )
all: ${PDF_FILES}
MadScientist suggested just that in the comments
Otherwise you could implement a script using the tools available on your operating system and add an additional target update: that would compute the list of files and replace the line starting with PDF_FILES with an updated list of files.
Final version of the code that worked for Windows, based on #DmitiChubarov and #MadScientist's suggestions is as follows:
%.pdf: %.md
pandoc $^ -o $#
PDF_FILES:=$(shell dir /s /b *.md | sed "s/\.md/\.pdf/g")
all: ${PDF_FILES}

How to write a makefile executing make one directory level up

Can I write a wrapper makefile that will cd one level up and execute there make with all the command options I have given the wrapper?
In more detail:
Directory project contains a real Makefile with some different targets.
Directory project/resources contains the wrapper Makefile which should call Makefile in project.
When I am in my shell in directory project/resources, I execute
make TARGET
and the Makefile there just cds one directory up and calls
make TARGET
in the directory project.
Is this possible? And how?
You could use a very simple Makefile for all your sub-directories:
%:
$(MAKE) -C .. $#
% is a last resort match-anything pattern rule that will match any target... for which there is no implicit rule (GNU make has an incredibly large number of implicit rules). So, if none of your targets are covered by an implicit rule, this should work. Else you will have to tell make not to use the implicit rules it knows. This can be done (with GNU make) by calling make with the -r option:
cd project/resources
make -r <anything>
will call make in project for target <anything>. The main drawback is that the -r flag is passed to the sub-make and so the implicit rules will not apply neither in project, which can be a problem. If it is you can obtain the same effect by adding an empty .SUFFIXES target to theMakefile in project/resources:
.SUFFIXES:
%:
$(MAKE) -C .. $#
With my version of GNU make (3.82) it works like a charm and the sub-make has all the default implicit rules.
Yes, you can have a makefile which works for "any" target.
The GNU make manual discusses this in the Overriding Part of Another Makefile section:
Sometimes it is useful to have a makefile that is mostly just like another makefile. You can often use the ‘include’ directive to include one in the other, and add more targets or variable definitions. However, it is invalid for two makefiles to give different recipes for the same target. But there is another way.
In the containing makefile (the one that wants to include the other), you can use a match-anything pattern rule to say that to remake any target that cannot be made from the information in the containing makefile, make should look in another makefile. See Pattern Rules, for more information on pattern rules.
For example, if you have a makefile called Makefile that says how to make the target ‘foo’ (and other targets), you can write a makefile called GNUmakefile that contains:
foo:
frobnicate > foo
%: force
#$(MAKE) -f Makefile $#
force: ;
If you say ‘make foo’, make will find GNUmakefile, read it, and see that to make foo, it needs to run the recipe ‘frobnicate > foo’. If you say ‘make bar’, make will find no way to make bar in GNUmakefile, so it will use the recipe from the pattern rule: ‘make -f Makefile bar’. If Makefile provides a rule for updating bar, make will apply the rule. And likewise for any other target that GNUmakefile does not say how to make.
The way this works is that the pattern rule has a pattern of just ‘%’, so it matches any target whatever. The rule specifies a prerequisite force, to guarantee that the recipe will be run even if the target file already exists. We give the force target an empty recipe to prevent make from searching for an implicit rule to build it—otherwise it would apply the same match-anything rule to force itself and create a prerequisite loop!
One option: use a wrapper file to execute the commands to do that. Just be sure your target make files don't include the child directory that has the wrapper, or else you can create an endless loop. For example,
clean:
pushd .. && make clean && popd
Using the comment of user Renaud Pacalet and the answer to a different question the following one-liner is as close as I could get. The whole Makefile reads:
IGNORE := $(shell $(MAKE) -C .. $(MAKECMDGOALS))
This solutions comes with a few caveats:
Command line option -B does not get passed through to the subsequent make call.
The output of the subsequently called make process (in the project directory) is not printed to stdout.
The wrapper make process reports for any given target at the end :
make: *** No rule to make target TARGET. Stop.

Adding custom commands to existing targets in qmake

Is there a way to specify, in a .pro file, extra commands to be added to a standard target in the Makefile that qmake generates? For example, consider distclean, extra commands might be desired to:
Remove *~ files.
Clean out runtime-generated output files from the source tree.
Etc.
I want to use the normal target and not a custom target because I want this to be completely transparent in my workflow. That is (again using distclean as an example), I don't want to...
... require knowledge in a multi-project setup that certain Makefiles use a custom rule instead of distclean.
... document custom rules, even for stand-alone projects, as distclean is already well-known and intuitive†.
I found How to add custom targets in a qmake generated Makefile?, but this describes adding custom targets (which is already documented, even back in 4.6) rather than adding rules to existing targets. While it does contain some hints, all of them require adding new custom targets, as specifying the same target more than once in a Makefile replaces (not adds) commands from the previous target.
The only thing I could really think of to try was to add target.commands += new commands to the .pro file as a wild guess (e.g distclean.commands += rm \"*~\"). This has no effect.
How can I transparently add custom commands to existing targets with qmake?
† For the distclean example: While maintainer-clean is also on that "standard target" list, in practice I have found it to be rarely used, and in any case qmake doesn't generate it by default; I consider it to be unsuitable.
There are two straightforward ways to accomplish this, depending on how self-contained / portable you want your solution to be and how lenient you want to be with the order of command execution.
Option 1
The first option is to create a custom target in the .pro file for the new commands, then add that target as a prerequisite to the standard target that you are modifying. Going back to the distclean example, let's say you want to add a command to remove all *~ files:
Create a custom target in your .pro file. Note that you have to escape quotes and slashes in .pro files. For example, add:
extraclean.commands = find . -name \"*~\" -exec rm -v {} \\;
Add this target as a dependency of the target you are modifying:
distclean.depends = extraclean
This won't actually modify the distclean rule just yet, as this method can't be used to modify existing rules. However...
Add both your new target and the target you are modifying as extra targets:
QMAKE_EXTRA_TARGETS += distclean extraclean
This will add a second specification of distclean to the Makefile, but this works because you can add dependencies to existing targets in make in separate rules, even though you can't add commands that way. If you were to also specify distclean.commands in your .pro file, you would break the existing distclean by replacing its default recipe.
So, putting that all together, in the .pro file:
extraclean.commands = find . -name \"*~\" -exec rm -v {} \\;
distclean.depends = extraclean
QMAKE_EXTRA_TARGETS += distclean extraclean
Where extraclean is some custom target with the commands you want to add, and distclean is the existing target that you wish to modify.
Pros:
Completely self-contained in a .pro file.
As portable as you can get, leaves the actual Makefile syntax and generation up to qmake.
Cons:
Your new commands aren't appended to the existing recipe. Rather, they happen after all prerequisite targets are satisfied but before the existing recipe. In the distclean example, with the version of qmake that I'm using, this places the commands after the source tree clean but before Makefile itself is deleted (which is the only action the default recipe takes). This is not an issue for this example, but may be an issue for you.
Option 2
The second option is to change the name of the Makefile that qmake generates, and create your own custom Makefile that defers to the generated one, rather than includes + overrides it. This is also a straightforward option; while not as self-contained as option 1, it gives you the ability to execute commands both before and after the default generated recipe.
You don't want to include + override the existing Makefile, because you don't want to replace the default recipes. If you do, you have to re-implement the default, but this can be an issue as that default may change (and you have to keep up with the changes). It's best to let qmake do as much work as possible, and not repeat its work.
To do this:
First, change the name of the file that qmake generates. This can be accomplished by adding a line such as this to the .pro file:
MAKEFILE = RealMakefile
That will cause qmake to output RealMakefile instead of Makefile.
The next step is to create your own Makefile with your custom commands. However, there are some caveats here. First, a full example, again using distclean. In a file named Makefile:
.DEFAULT_GOAL := all
%:
#$(MAKE) -f RealMakefile $#
distclean:
#$(MAKE) -f RealMakefile $#
#find . -name "*~" -exec rm -v {} \;
Some notes about this:
We set .DEFAULT_GOAL because otherwise distclean would be the default. An alternative to this, if you're not comfortable with .DEFAULT_GOAL, is to specify an all rule using #$(MAKE) -f RealMakefile $# as the recipe.
The % target matches any target that isn't otherwise defined in this Makefile. It simply delegates processing to RealMakefile.
The distclean target is where we add our commands. We still need to delegate to RealMakefile, but additional commands can be added both before and after that happens.
Pros:
More control over command order. Commands can be added both before and after the default recipe.
Cons:
Not self-contained in a .pro.
Not as portable: It doesn't leave all Makefile generation up to qmake, and also I'm not actually sure what parts are specific to GNU make here (comments welcome).
So, while this answer may be a little long, both of these methods are very straightforward. I would prefer option 1 unless the command execution order is an issue.
Another solution is to add files you want to delete to the QMAKE_CLEAN and QMAKE_DISTCLEAN qmake variables.
build_tests {
TINYORM_SQLITE_DATABASE = $$quote($$TINYORM_BUILD_TREE/tests/q_tinyorm_test_1.sqlite3)
QMAKE_CLEAN = $$TINYORM_SQLITE_DATABASE
QMAKE_DISTCLEAN = $$TINYORM_SQLITE_DATABASE
}
It is relevant only, when do you know files you want to delete, so in this case, you can not use rm command or some sort of globbing.

Passing rules to make recursively

It's probably trivial to do this but I can't see how.
I want to have a parent Makefile to decide which Makefile to call recursively based on the value of a variable passed in the command line.
I.e., I want to be able to call my main Makefile with:
make some_rule TARGET=a
or
make some_rule TARGET=b
and have my main Makefile decide based on the value of TARGET which makefile to invoke to run make some_rule. (For example, decide whether to call sub_directory_a/Makefile or sub_directory_b/Makefile to execute rule some_rule.)
Note: I have many different rules, so I do not want my main Makefile to list all the possible rules and for each of them call recursively the correct Makefile. I am hoping my main Makefile can only be a few lines long and not have to be updated whenever I create new rules.
You could do what you describe with
default_target:
%:
$(MAKE) -C some_directory_$(TARGET) $#
The %: rule is a pattern rule in which the pattern matches all rules (called a match-anything rule by the GNU make manual); $# is the current target. Note that the default_target: rule doesn't have a recipe, so calling make without a target will use the recipe of the match-anything rule (the only one that applies and has a recipe) to try to build default_target.
The caveat of this approach is that targets cannot be declared phony. If you want to have phony targets, you'll have to specify the recipe for those targets again, for example
PHONY_TARGETS = all clean distclean
.PHONY: $(PHONY_TARGETS)
$(PHONY_TARGETS):
$(MAKE) -C some_directory_$(TARGET) $#
%:
$(MAKE) -C some_directory_$(TARGET) $#
Unfortunately, I do not know a trick to declare all targets phony, which is what you'd really want to do.
Note that you can use ifeq etc. with the variables you set at the command line if you want to allow more fancy values for TARGET than parts of directory names, such as
%:
ifeq ($(TARGET),gibson)
echo 'Planet $# was successfully hacked.'
else
$(MAKE) -C some_directory_$(TARGET) $#
endif
Also note that a more common way to set common variables for many Makefiles is to put them into a file, often common.mk, and include it from the other Makefiles:
include ../common.mk # to include common.mk from some_directory_a/Makefile
But you'll have to decide yourself which approach is a better fit for your project.

Makefile rule depend on directory content changes

Using Make is there a nice way to depend on a directories contents.
Essentially I have some generated code which the application code depends on. The generated code only needs to change if the contents of a directory changes, not necessarily if the files within change their content. So if a file is removed or added or renamed I need the rule to run.
My first thought is generate a text file listing of the directory and diff that with the last listing. A change means rerun the build. I think I will have to pass off the generate and diff part to a bash script.
I am hoping somehow in their infinite intelligence might have an easier solution.
Kudos to gjulianm who got me on the right track. His solution works perfect for a single directory.
To get it working recursively I did the following.
ASSET_DIRS = $(shell find ../../assets/ -type d)
ASSET_FILES = $(shell find ../../assets/ -type f -name '*')
codegen: ../../assets/ $(ASSET_DIRS) $(ASSET_FILES)
generate-my-code
It appears now any changes to the directory or files (add, delete, rename, modify) will cause this rule to run. There is likely some issue with file names here (spaces might cause issues).
Let's say your directory is called dir, then this makefile will do what you want:
FILES = $(wildcard dir/*)
codegen: dir # Add $(FILES) here if you want the rule to run on file changes too.
generate-my-code
As the comment says, you can also add the FILES variable if you want the code to depend on file contents too.
A disadvantage of having the rule depend on a directory is that any change to that directory will cause the rule to be out-of-date — including creating generated files in that directory. So unless you segregate source and target files into different directories, the rule will trigger on every make.
Here is an alternative approach that allows you to specify a subset of files for which additions, deletions, and changes are relevant. Suppose for example that only *.foo files are relevant.
# replace indentation with tabs if copy-pasting
.PHONY: codegen
codegen:
find . -name '*.foo' |sort >.filelist.new
diff .filelist.current .filelist.new || cp -f .filelist.new .filelist.current
rm -f .filelist.new
$(MAKE) generate
generate: .filelist.current $(shell cat .filelist.current)
generate-my-code
.PHONY: clean
clean:
rm -f .filelist.*
The second line in the codegen rule ensures that .filelist.current is only modified when the list of relevant files changes, avoiding false-positive triggering of the generate rule.

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