Yusuf,

Y> In this case Borland C++ compiler is not trustworthy.
Y> If so, why do they advertise their C++Builder technology?
Y> I know it uses Delphi VCL, but still C++.

Borland C++ did not use the same compiler as the current C++ Builder.
That compiler is more than a decade old and I don't know any other
decade-old compilers that are able to build the current Firebird on
Windows. The current (2007) C++ Builder compiler *might* be able to
build Firebird but apparently there's no point in trying because
Firebird already supports the platform official compiler (Microsoft's)
and an open source one (gcc on MinGW) on Windows.

Ciao
--
Nando Dessena
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