CODEWITHSUNDEEP
c++visual-studio-2015
Richard
Richard

Reputation: 8758

Set execution character set for Visual C++ compiler

Is it possible to set the execution character set for Visual C++ compiler?

Problem

When trying to convert an (UCN) string literal to a wide string, a runtime crash happens when using Visual Studio 2015 for compilation:

std::string narrowUCN = "\u00E4\u00F6\u00FC\u00DF\u20AC\u0040";
std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>, wchar_t> convertWindows;
std::wstring wide = convertWindows.from_bytes(narrowUCN); // Unhandled C++ exception in xlocbuf, line 426.

Using narrowUCN = u8"\u00E4\u00F6\u00FC\u00DF\u20AC\u0040" works so I assume a problem with the execution character set?

Upvotes: 1

Views: 1628

Answers (1)

Richard
Richard

Reputation: 8758

Since Visual Studio 2015 Update 2, it is possible to set the execution character set to UTF-8 using the compiler option /utf-8. Then the conversion of narrow string literals, that don't use u8, will work. This is because those string literals are then converted to UTF-8 instead of the system's codepage (which is the default behaviour of Visual C++ compiler).

The option /utf-8 is a synonym for /source-charset:utf-8 and /execution-charset:utf-8. From the link above:

In those cases where BOM-less UTF-8 files already exist or where changing to a BOM is a problem, use the /source-charset:utf-8 option to correctly read these files.

Use of /execution-charset or /utf-8 can help when targeting code between Linux and Windows as Linux commonly uses BOM-less UTF-8 files and a UTF-8 execution character set.

PS: Don't confuse this with the character set setting in the common project configuration page which only sets the Macros Unicode/MBCS (historical reasons).

Upvotes: 3

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