https://svn.boost.org/trac10/ticket/10091 <p> I got a C4819 warning as below. This bug was in there even since boost 1.33.1 or earlier. This problem occurs in different version of VC++ and different Windows. </p> <p> 4&gt;D:\Code\boost\include\boost-1_55\boost/format/alt_sstream_impl.hpp : warning C4819: The file contains a character that cannot be represented in the current code page (950). Save the file in Unicode </p> <p> It is cause by the comment "operation guaranteed by 27.4.3.2 table 88 ". </p> <p> If you check it by a binary editor, there is a codepoint 0xA7 before "27.4.3.2". That codepoint will cause a problem in codepage 950 (Taiwan), 932 (Japan), 936 (China), 949 (Korea) under Windows. </p> <p> The <a class="ext-link" href="http://stackoverflow.com/questions/10501634/warning-c4819-how-to-find-the-character-that-has-to-be-saved-in-unicode"><span class="icon">​</span>http://stackoverflow.com/questions/10501634/warning-c4819-how-to-find-the-character-that-has-to-be-saved-in-unicode</a> described the same problem. </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/10091 Trac 1.4.3 James E. King, III Thu, 12 Oct 2017 13:50:25 GMT https://svn.boost.org/trac10/ticket/10091#comment:1 https://svn.boost.org/trac10/ticket/10091#comment:1 <ul> <li><strong>status</strong> <span class="trac-field-old">new</span> → <span class="trac-field-new">closed</span> </li> <li><strong>resolution</strong> → <span class="trac-field-new">duplicate</span> </li> <li><strong>milestone</strong> <span class="trac-field-old">To Be Determined</span> → <span class="trac-field-new">Boost 1.63.0</span> </li> </ul> <p> Duplicate of <a class="closed ticket" href="https://svn.boost.org/trac10/ticket/12691" title="#12691: Bugs: remove special character for compile warning (closed: fixed)">#12691</a> </p> Ticket