Thomas Schwinge, le Thu 27 Sep 2012 09:15:23 +0200, a écrit : > $ gcc -dM -E -x c - < /dev/null | grep -i mach > #define __MACH 1 > #define __MACH__ 1 > #define MACH 1 On Linux i386, both "linux" and "i386" macros are defined, which poses its own problems too. I'd indeed tend to say that defining a non-underscored macro is only a way for troubles. Samuel