[Vm-dev] How to think about cogit.c compile error that is consistent in both gnu an cmake builds

Eliot Miranda eliot.miranda at gmail.com
Thu Jul 31 17:39:16 UTC 2014

On Thu, Jul 31, 2014 at 6:48 AM, gettimothy <gettimothy at zoho.com> wrote:

> Hi Eliot.
> What/where sets the PRODUCTION and NoDbgRegParms  variables in the #if
> !PRODUCTION && defined(__GNUC__) && !defined(NoDbgRegParms) check ?

PRODUCTION is defined in platforms/Cross/vm/sqAssert.h

The !defined(NoDbgRegParms) phrase allows someone to define an alternative
on the command line via a -D argument, so it allows the
    # define NoDbgRegParms __attribute__ ((regparm (0)))
def to be a default, rather thna the only way.

> Are they set by 'somewhere' by various -D flags in the mvm? I have grepped
> to no avail.
> Here is my thinking at the moment. The compiler error is showing that the
> NoDbgRegParms is not being replaced.
>  /home/wm/usr/src/smalltalk/CMake.oscog/cogVMMaker/Contents/Resources/oscogvm/src/vm/cogit.c:1071:13:
> note: previous declaration of 'ssAllocateRequiredRegMaskupThrough' was here
> static void ssAllocateRequiredRegMaskupThrough(sqInt requiredRegsMask,
> sqInt stackPtr) *NoDbgRegParms*;
> ^
> /home/wm/usr/src/smalltalk/CMake.oscog/cogVMMaker/Contents/Resources/oscogvm/src/vm/cogit.c:20947:1:
> error: conflicting types for 'ssAllocateRequiredReg'
> ssAllocateRequiredReg(sqInt requiredReg)
> So the question becomes "why not".
> Well, because the pre-processor (?) is not replacing them. Why? hmmmm....

Both gcc -v & gcc -E can help debug these kinds of things.

thx for your time.
> tty
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