> Could anyone there tell which segment registers does the compiler use > (CS, DS, ES, FS, GS), or if it doesn't use any at all and rely on the > default segments all the time? > > Is there any way to tell it that a specific variable resides, or is > addressable only through a specific segment register? By "use" do you mean to ask whether segmented pointers are supported in the Intel GCC C++ compiler? I asked a similar question a week or two ago, and the answer was "no". (Recall that segmented memory architecture is not supported on many of the target platforms for GCC, so this would be an target specific extension, and one that is fairly invasive, as well.) I believe that the GCC C++ compiler only supports the "tiny, flat" model on iapX86. I know this is a GCC maillist, and it may be heresy, but I'd recommend looking at the Watcom C++ Compiler (www.openwatcom.org) if you are looking for segment:offset type pointers (48 bits). Be aware that you may have to give up other language feature in exchange - I'm not sure how up-to-date / std compliant the Watcom compiler is, particularly for advanced template handling.
