[vbox-dev] Is gcc 3.3.x really necessary to compile the recompiler?

[Nikolay Igotti]

  Hi Huihong,

Actually this file is built on Windows using cross-compiler for Linux 
target :). It's being built this way, because there was no good MinGW 
for 64-bit at times it was done, and REM relies on GCC extensions 
(notably global registers variables and some FP stuff) to function 
correctly. Right approach would be to rebuild recompiler with MSVC 
eventually, but it needs a volunteer (I think it was done for QEMU, so 
should be feasible).
Also if taking MinGW64 approach don't forget calling convention 
difference on AMD64 between Linux and Windows. REM relies on that too 
(not too hard to fix, for sure, just need a bit of understanding in TCG).

If you (or someone else on this list ) will do that - I can help with 
getting patch integrated (never found enough time/desire to do that myself).

Thanks,
Nikolay.


Huihong Luo пишет:
> Hi Nikolay,
> Thanks for the clarification. It's much easier without sticking to the 
> old gcc version.
> Yes, I noticed that VBoxRem2.rel is an ELF image. Can you explain how 
> this file is built? I assume it's done on Linux. Do you use mingw 
> toolchain on linux to do the cross compile? Since it's ELF image, 
> perhaps it's built from pure linux gcc (w/o cross compile to windows)?
> I am trying to eliminate VBoxREM2.rel on windows using MingW64, in 
> other words, combining the current VBoxREM.dll + VBoxREM2.rel ==> 
> VBoxREM.dll
> Thanks,
> Huihong
>
> --- On *Tue, 7/14/09, Nikolay Igotti /<Nikolay.Igotti at Sun.COM>/* wrote:
>
>
>     From: Nikolay Igotti <Nikolay.Igotti at Sun.COM>
>     Subject: Re: [vbox-dev] Is gcc 3.3.x really necessary to compile
>     the recompiler?
>     To: "Huihong Luo" <huisinro at yahoo.com>
>     Cc: "VirtualBox developer's list" <vbox-dev at virtualbox.org>
>     Date: Tuesday, July 14, 2009, 2:24 AM
>
>     Hi Huihong,
>
>
>     Recompiler should build OK with recent gcc. Gcc 3 limitation was
>     applicable to 'old' recompiler, not relying on TCG for
>     codegeneration. Windows 64-bit REM is built to ELF image, not PE,
>     thus MinGW shall be of little help to you.
>
>     Thanks,
>     Nikolay.
>
>
>     Huihong Luo wrote:
>     > The reason I asked is that gcc 4.4.3 seems to be working fine on
>     linux, so I am very confused about gcc requirement.
>     > I am trying to use the latest gcc4.4.0 mingw64 bit on amd64 to
>     build the recompiler, would this be a problem?
>     > Does 3.3.x requirement only apply to mingw32? in other cases,
>     gcc 4 is OK?
>     > Thanks,
>     >
>     >
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