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Automatically generate Fortran dependencies

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A python script to automatically generate Fortran dependencies.

Given a set of files, fortdepend automatically constructs the dependency graph for the programs and files and can write a dependency file suitable for Makefiles. fortdepend now uses pcpp, a preprocessor written in Python, so it can determine which modules will actually be used when you compile.

You can even use fortdepend to draw the graph of the module dependencies (requires graphviz)!

Complete documentation is available on ReadTheDocs.

Original script by D. Dickinson


You can install fortdepend with pip:

pip3 install --user fortdepend


fortdepend requires Python 3.

fortdepend works by looking for matching pairs of program <name>/end program <name> and module <name>/end module <name>, and so will not work on Fortran 77-style files that just use end without the appropriate label.


Basic usage:

fortdepend -o Makefile.dep

This will look for all files ending in .f90 or .F90 in the current directory and write the output to Makefile.dep. The output will something like this:

test :  \
        moduleA.o \
        moduleB.o \
        moduleC.o \
        moduleD.o \

moduleA.o :

moduleB.o :  \

moduleC.o :  \
        moduleA.o \

moduleD.o :  \

You could then get a basic makefile working by putting the following in Makefile:

    gfortran -c $<

    gfortran $^ -o $@

include Makefile.dep

And make test will magically build everything in the correct order!

Move advanced use

You can specify preprocessor macros with -D and search paths with -I:

fortdepend -DMACRO=42 -Isome/include/dir -o Makefile.dep

will replace instances of MACRO with 42 according to the usual C99 preprocessor rules. This can be used to conditionally use some modules or change which module is used at compile time.

Full command line arguments:

$ fortdepend --help
usage: fortdepend [-h] [-f FILES [FILES ...]] [-D NAME[=DESCRIPTION]
                  [NAME[=DESCRIPTION] ...]] [-b BUILD] [-o OUTPUT] [-g] [-v]
                  [-w] [-c] [-e EXCLUDE_FILES [EXCLUDE_FILES ...]]
                  [-i IGNORE_MODULES [IGNORE_MODULES ...]]

Generate Fortran dependencies

optional arguments:
  -h, --help            show this help message and exit
  -f FILES [FILES ...], --files FILES [FILES ...]
                        Files to process
                        Preprocessor define statements
  -I dir                Add dir to the preprocessor search path
  -b BUILD, --build BUILD
                        Build Directory (prepended to all files in output)
  -o OUTPUT, --output OUTPUT
                        Output file
  -g, --graph           Make a graph of the project
  -v, --verbose         explain what is done
  -w, --overwrite       Overwrite output file without warning
  -c, --colour          Print in colour
                        Files to exclude
                        Modules to ignore
  --skip-programs       Don't include programs in the output file
  -n, --no-preprocessor
                        Don't use the preprocessor

Here's a slightly more advanced example of how to use fortdepend in your makefiles:

# Script to generate the dependencies

# $(DEP_FILE) is a .dep file generated by fortdepend
DEP_FILE = my_project.dep

# Source files to compile
OBJECTS = mod_file1.f90 \

# Make sure everything depends on the .dep file
all: $(actual_executable) $(DEP_FILE)

# Make dependencies
.PHONY: depend
depend: $(DEP_FILE)

# The .dep file depends on the source files, so it automatically gets updated
# when you change your source
    @echo "Making dependencies!"
    cd $(SRCPATH) && $(MAKEDEPEND) -w -o /path/to/$(DEP_FILE) -f $(OBJECTS)

include $(DEP_FILE)

This will automatically rebuild the dependency file if any of the source files change. You might not like to do this if you have a lot of files and need to preprocess them!

Project details

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