Intel compiler 8.0 pretends to be gcc 3.2.

[H. J. Lu]

On Sat, Jun 21, 2003 at 07:37:11AM -0700, Martin Buchholz wrote:
> You folks should be aware that gcc is no longer the only compiler that
> defines __GNUC__.  Version 8 of icc for Linux does this as well.
> 
> In addition to defining the expected macro
> 
> __INTEL_COMPILER
> 
> it also defines these surprising macros:
> 
>     -D__GNUC__=3 \
>     -D__GNUC_MINOR__=2 \
>     -D__GNUC_PATCHLEVEL__=0 \
>     -D__GNUG__=3 \
> 
> Given the high degree of gcc-compatibility that icc attains, these
> definitions are understandable, but likely to be controversial.
> 
> The test
> 
> #ifdef __GNUC__
> 
> no longer conclusively identifies gcc.
> 
> I have had to change one such test to
> 
> #if defined (__GNUC__) && !defined (__INTEL_COMPILER)
> 
> to enable compilation with both gcc and icc in my own code,
> where icc's emulation of gcc is imperfect.
> 

Do you know what part is imperfect? As far as I know, icc 8.0 doesn't
support nested functions nor asm statements on ia64. I am working on
a gcc patch to support icc 8.0 ia64 intrinsics so that asm statements
can be avoid.


H.J.