Default font has no slant=italic but I want to show italic text

Question

My preferred font is -*-fixed-*-*-*--14-*-*-*-*-*-*-* and it doesn't have slant=italic variation.

I also like -*-terminus-*-*-*-*-14-*-*-*-*-*-*-* font and under Debian there is special xfonts-terminus-oblique package to provide italic font variation.

How to tell Emacs to use terminus font for italic :slant?

I can't use terminus as default because it misses some glyphs.

Answer 1

(set-frame-font "-*-terminus-*-*-*--14-*-*-*-c-*-*-*")
(setq-default line-spacing nil)
(set-fontset-font nil 'cyrillic "-*-terminus-*-*-*--14-*-*-*-c-*-*-*")
(set-fontset-font nil 'greek "-*-terminus-*-*-*--14-*-*-*-c-*-*-*")
(set-fontset-font nil nil "-misc-fixed-*-*-*--13-*-*-*-*-*-*-*")
(set-fontset-font nil 'phonetic "-misc-fixed-*-*-*--13-*-*-*-*-*-*-*")
(set-fontset-font nil 'symbol "-misc-fixed-*-*-*--13-*-*-*-*-*-*-*")
;; MODIFIER LETTER is not present in terminus, this includes ˌːˈ characters.
(set-fontset-font nil '(#x02C0 . #x02FF) "-misc-fixed-*-*-*--13-*-*-*-*-*-*-*")

I don't understand why

(set-fontset-font nil nil "-misc-fixed-*-*-*--13-*-*-*-*-*-*-*")

is not in effect. So I should include

(set-fontset-font nil '(#x02C0 . #x02FF) "-misc-fixed-*-*-*--13-*-*-*-*-*-*-*")