diffutils bug (diff exe): ignore-file-name-case option

[Martin Schmidt-Linden]

Hello GNU team,

the diff program from diffutils doesn't operate the "ignore-file-name-case"
option correctly. I used diffutils 2.8.1 source from gnu.org to verify this.

The problem is in dir.c, in the function:
static int compare_names (char const *name1, char const *name2)
which at first checks for ignore-file-name-case, but then checks for
locale-sensitive name compare (locale_specific_sorting) and doesn't ignore
the filename case anymore.

The return value uses:
return file_name_cmp (name1, name2);
which equals to strcmp and also doesn't ignore the filename case.

I am sorry that I can't provide a patch, but I haven't read deep into the
locale thing.

Greetings,
Martin

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