glib-compile-resources: generate .d-file style dependency
Add --dependency-file=foo.d option to generate a gcc -M -MF style dependency file for other build tools. The current output of --generate-dependencies is only useful for use directly in Makefile rules, but can't be used in other build systems like that. The generated dependency file looks like this: $ glib-compile-resources --sourcedir= test.gresource.xml --dependency-file=- test.gresource.xml: test1.txt test2.txt test2.txt test1.txt: test2.txt: test2.txt: Unlike --generate-dependencies, the --dependency-file option can be used together with other --generate options to create dependencies as side-effect of generating sources. Based on a patch by Tim-Philipp Müller in https://bugzilla.gnome.org/show_bug.cgi?id=745754 The changes in this patch, compared to his are to always return the hash table with file information from parse_resource_file, so we can use it for dependency output, regardless if generate_dependencies was TRUE or not.
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