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From: "kayhayen at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/48740] Raw C++0x strings and trigraphs mix badly
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D48740

--- Comment #7 from Kay Hayen <kayhayen at gmx dot de> 2011-04-23 11:05:52 =
UTC ---
Created attachment 24079
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=3D24079
Sorry for the typo, that's what you get for extracting test case. This one =
is
better.

With this one I can reproduce my original worry indeed:

[~]> g++ -c --std=3Dc++0x testcase.cpp -Wall -Werror
testcase.cpp:2:17: error: unterminated raw string
testcase.cpp:2:15: error: expected primary-expression at end of input
testcase.cpp:2:15: error: expected =E2=80=98,=E2=80=99 or =E2=80=98;=E2=80=
=99 at end of input

Since the trigraph eats up the trigraph terminator, it's not terminated. Now
imagine a second constant in the same file and you do get a corrupted outpu=
t.