Re: GCC: non-conforming implementation of C++

"Bo Persson" <>
Sat, 28 Jul 2007 19:27:01 +0200
MQ wrote:
:: On Jul 28, 8:29 pm, "Bo Persson" <> wrote:
::: Yes, this is considered a bug in the standard document. :-)
::: For the next edition of the standard, this section has been
::: rephrased as:
::: A translation unit that includes a standard library header shall
::: not #define or #undef names declared in any standard library
::: header.
::: A translation unit shall not #define or #undef names lexically
::: identical to keywords.
::: Bo Persson
:: Thanks for the link. As the implementor of a compiler, should I
:: make this an error, forcing termination of compilation? For
:: interest's sake, is there any real concern with compatibility with
:: old code if I did this?

Depending on your audience, you should probably consider having this
selectable at compile time. Older *very popular* compilers, like MS
VC6, did strange things like

#ifdef _DEBUG
   #define new DEBUG_NEW

which was technically sort of ok at the time, as the compiler appeared
before the first C++ standard.

There are TONS of old code around, some of which you cannot change
whatever you do. A very popular OS is installed in 100s of millions of
copies, using pre-standard data types.

If you try to sell your compiler, you first have to decide if it
should accept this code:

#include "windows.h"

int main()
{ }

Your choice! :-)

Bo Persson

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