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The project started to move away from recursive Makefile a while ago for performance reasons. Unfortunately, even though tools like libtool can handle an arbitrary number of files by using @filelists, automake is subject[^1][^2] to max argument limitation in its `distdir-am` target, which will try to expand $(DISTFILES) in the bash command line. [^1]: https://lists.gnu.org/archive/html/bug-automake/2009-07/msg00008.html [^2]: https://lists.gnu.org/archive/html/automake/2014-05/msg00015.html This is workarounded in this commit by moving all the files from Qt in a separate Makefile that will be recursively called by automake, reducing the size of $(DISTFILES). Hopefully, Make/Automake would have fixed this or we would have moved completely to Meson when we reach the limit again.
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