I would like to see that GCC define a macro in the case it is being used to compile a program. Currently there is a __GNUC__ macro defined by the GNU C preprocessor CPP. That does not suit the need. As the CPP Manual says: __GNUC__ is "defined by all GNU compilers that use the C preprocessor". It seems to imply that any (non-GNU) compiler that uses the GNU C preprocessor would also have __GNUC__ defined. According to their respective manuals, Intel C++ Compiler and Portable C Compiler also pre-define __GNUC__, possibly because they use the GNU CPP. Therefore, the fact that __GNUC__ is defined does not necessarily mean the GCC compiler proper is being used. There is a need for a macro that definitely confirms that GCC is being used. (It is another matter if another complier deliberately misleads people by defining the same macro.) And I hope that macro can be documented in the GCC Manual.
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