Indeed, if I replace
character(len=100, kind=ucs4) :: string
simply by
character(len=100) :: string
in my program, ifx does read my UTF-8 file, does print the French characters in terminal and does write correctly the UTF-8 utf_out.txt file…
$ ifx fr.f90 && ./a.out
Lire des caractères accentués n'est pas difficile. Inutile d'apprendre ça par cœur.
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But the program then does not work anymore correctly with GFortran…
Things are not yet clear in my mind…