[GCC-XML]Interoperability with gcc/mingw question

[Dave Hooper]

> ./gccxml --gccxml-compiler "gcc" --gccxml-cxxflags "-mno-cygwin" \
>          source.cpp -fxml=source.xml

In both a Windows cmd shell and bash under cygwin, this gives:
Compiler "gcc" is not supported by GCC_XML.
Could not determine GCCXML_FLAGS setting.

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