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Internally, strings were stored using Unicode code points. However, when
being written to disk with the `file:write_file()` function, there were
converted to ISO-8859-1. According to the documentation, that is because
the file module is bytewise-oriented: the conversion to another encoding
than ISO-8859-1 is the responsibility of the caller.
Using unicode:character_to_binary() permits the script to convert the
Unicode string to an UTF-8-encoded binary.
Without this patch, the added testcase would fail with the following
error:
gmake[3]: *** No rule to make target '(...)/erlang.mk/test/h��test_core_makedep_non_usascii_paths/deps/test_core_makedep_non_usascii_paths_dep/include/hello.hrl', needed by 'src/hello.erl'. Stop.
In this case, the path (passed from the Makefile to the `makedep.erl`
script) contains UTF-8-encoded `é` characters but it was converted when
doing the final file I/O.
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