Variable: c-multiline-string-start-char
c-multiline-string-start-char is a buffer-local variable defined in
cc-engine.el.gz.
Documentation
Set if the language supports multiline string literals without escaped newlines. If t, all string literals are multiline. If a character, only literals where the open quote is immediately preceded by that literal are multiline.
Note that from CC Mode 5.36, this character use is obsolete,
having been superseded by the "multi-line string" mechanism.
If both mechanisms are set for a language, the newer one prevails
over the old c-multiline-string-start-char. See the variables
in the page containing c-ml-string-opener-re in cc-langs.el for
further directions.
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/cc-engine.el.gz
(c-declare-lang-variables)