Compiling x64 code in VC++ 6.0?

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  1. #1
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    Compiling x64 code in VC++ 6.0?

    Hi,
    I know VC++ 6.0 came out way before x64, but is it even remotely possible to compile an x64 DLL on VC++ 6.0?
    All our projects are for VC++ 6.0 and somehow a developer (who left the company) managed to compile an x64 DLL. I'm wondering how he did it? Some other developers say he used a .mak file rather than the .dsp & GUI; and in the .mak file I do see "_M_AMD64" defined, but surely that by itself couldn't allow VC++ 6.0 to create an x64 DLL?
    Is it possible he may have just used a newer VC++ to compile the .mak file and have it still be binarily compatible with the other 6.0 binaries?

  2. #2
    CSharpener vart's Avatar
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    If you install Windows SDK (the latest version compatible with VC6 is February 2003) - you will get the possibility to select Win64 as target
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

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    Quote Originally Posted by vart View Post
    If you install Windows SDK (the latest version compatible with VC6 is February 2003) - you will get the possibility to select Win64 as target
    But how is that even possible with VC++ 6.0? Doesn't it need to know about the new Rxx registers, 8-byte pointers...? Or is it good enough just to link against 64-bit libraries?

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    CSharpener vart's Avatar
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    Quote Originally Posted by cpjust View Post
    But how is that even possible with VC++ 6.0? Doesn't it need to know about the new Rxx registers, 8-byte pointers...? Or is it good enough just to link against 64-bit libraries?
    SDK provides updated compiler - it is a reason you have to place its bin directory before the VC6 native bin directory
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

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    OK, now this is strange...

    I ran:
    Code:
    SetEnv.cmd /X64 /RETAIL
    in the Platform SDK directory, then when I run NMAKE on my .mak file I get this error:
    Code:
    tempfile.bat
    Access is denied.
            0 file(s) copied.
    The system cannot find the file specified.
    NMAKE : fatal error U1077: 'tempfile.bat' : return code '0x1'
    What in the world is tempfile.bat and why is it looking for it?

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    Just a random guess: have you tried using "nmake -v" to see what nmake thinks it should be doing?

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    Please don't PM me for help - and no, I don't do help over instant messengers.

  7. #7
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    Quote Originally Posted by matsp View Post
    Just a random guess: have you tried using "nmake -v" to see what nmake thinks it should be doing?

    --
    Mats
    You mean NMAKE /N /F project.mak ALL?
    That gives me:
    Code:
    tempfile.bat
    del tempfile.bat
    EDIT: nevermind. It wasn't building anything because I already had a previous x86 build sitting in the Release directory. Doh!
    Last edited by cpjust; 07-29-2008 at 09:33 AM.

  8. #8
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    I must confess it was a long time since I used nmake, and I though it was more similar to the gnu/generic make that I've used more recently.

    My nmake (from vc6) says that it's got a /Y to "Disable batch mode". Perhaps that will help?

    Or perhaps /D to "display build information, or /P "display nmake information".

    Sorry if this is not very useful....

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    Please don't PM me for help - and no, I don't do help over instant messengers.

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