Compiler Warning (level 3) C4980

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'keyword' : use of this keyword requires /clr:oldSyntax command line option

A keyword from a previous version was used. Update your code to use newer syntax, or use /clr:oldSyntax. For more information about the newer syntax, see Component Extensions for Runtime Platforms.

C4980 is a warning that is always issued as an error. Use /wd to turn the warning off. See /w, /Wn, /WX, /Wall, /wln, /wdn, /wen, /won (Warning Level) for more information.

The following sample generates C4980:

// C4980.cpp
// compile with: /clr
int main() {
   int x1 = 0;
   int^ px = __box(x1);   // C4980
   int^ px2 = x1;   // OK
}