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(gcc-300.info)Multi-line Strings

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String Literals with Embedded Newlines
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   As an extension, GNU CPP permits string literals to cross multiple
lines without escaping the embedded newlines.  Each embedded newline is
replaced with a single `\n' character in the resulting string literal,
regardless of what form the newline took originally.

   CPP currently allows such strings in directives as well (other than
the `#include' family).  This is deprecated and will eventually be
removed.