-msext

Allows Microsoft® Visual C++ extensions.

Syntax
  -msext on | off
Remarks

Turn on this option to allow Microsoft Visual C++ extensions:

Related information
-char
-defaults
-encoding
-flag
-gccext
-gcc_extensions
-M
-make
-mapcr
-MM
-MD
-MMD
-once
-pragma
-relax_pointers
-requireprotos
-search
-trigraphs