[llvm-bugs] [Bug 39864] New: No support for -finput-charset other than UTF-8

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39864

            Bug ID: 39864
           Summary: No support for -finput-charset other than UTF-8
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nikolai.kosjar at qt.io
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Currently, clang does not support any other input character set than UTF-8:

  $ clang++ -finput-charset=SHIFT-JIS testtest.cpp
  clang-7: error: invalid value 'SHIFT-JIS' in '-finput-charset=SHIFT-JIS'

This comes from Clang.cpp:

  // -finput_charset=UTF-8 is default. Reject others
  if (Arg *inputCharset = Args.getLastArg(options::OPT_finput_charset_EQ)) {
    StringRef value = inputCharset->getValue();
    if (!value.equals_lower("utf-8"))
      D.Diag(diag::err_drv_invalid_value) << inputCharset->getAsString(Args)
                                          << value;
  }

  // -fexec_charset=UTF-8 is default. Reject others
  if (Arg *execCharset = Args.getLastArg(options::OPT_fexec_charset_EQ)) {
    StringRef value = execCharset->getValue();
    if (!value.equals_lower("utf-8"))
      D.Diag(diag::err_drv_invalid_value) << execCharset->getAsString(Args)
                                          << value;
  }

This was raised already multiple times on the mailing list:

 * http://lists.llvm.org/pipermail/cfe-dev/2011-June/015522.html
 * http://lists.llvm.org/pipermail/cfe-dev/2016-September/050814.html

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