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Intel compiler 8.0 pretends to be gcc 3.2.
- From: Martin Buchholz <martin at xemacs dot org>
- To: gcc at gcc dot gnu dot org
- Date: Sat, 21 Jun 2003 07:37:11 -0700
- Subject: Intel compiler 8.0 pretends to be gcc 3.2.
- Reply-to: martin at xemacs dot org
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.
(Prerelease versions of icc 8 are available from intel.com)
Martin