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Sure that programs will execute with the same effect whether or not theyĪre defined. You should not use these macros in any way unless you make These macros cause certain GNU header files to provide optimizedĭefinitions, using macros or inline functions, of system libraryįunctions. Their callers (when not optimizing, or when inlining has been _NO_INLINE_ is defined if no functions will be inlined into _OPTIMIZE_SIZE_ isĭefined if the compiler is optimizing for size, not speed. _OPTIMIZE_ isĭefined in all optimizing compilations. These macros describe the compilation mode. Particular form, but it can be counted on to contain at least the You should not rely on its contents having any This macro expands to a string constant which describes the version of This macro is defined if the target uses the ELF object format. Incremented on every ‘ #include’ directive and decremented at theĮnd of every included file. This macro expands to a decimal integer constant that represents theĭepth of nesting in include files. "/usr/local/include/myheader.h" would set this This macro expands to the basename of the current input file, in theįorm of a C string constant. On the command line of the preprocessor or C compiler. This is the source file that was specified This macro expands to the name of the main input file, in the form This macro exists primarily to direct GNU libc’s header files to use only
IAR ARM WARNING REDEFINITION OF MACRO CM3.H ISO
Or ISO C++, was specified when GCC was invoked. std switch specifying strict conformance to some version of ISO C GCC defines this macro if and only if the -ansi switch, or a Many people find this form easier to understand. Predefined macros directly in the conditional, you will need to write it
IAR ARM WARNING REDEFINITION OF MACRO CM3.H PATCH
Time the minor version is increased, the patch level is reset to zero Įach time the major version is increased, the Which depends on a specific version, you must be more careful. If all you need to know is whether or not your program is being compiledīy GCC, or a non-GCC compiler that claims to accept the GNU C dialects, Macros are also defined if you invoke the preprocessor directly. Version, minor version, and patch level of the compiler, as integerĬonstants. Preprocessor: C, C++, Objective-C and Fortran. These macros are defined by all GNU compilers that use the C Otherwise, the precompiled headers will not be used. _COUNTER_ is not expanded prior to inclusion of precompiled headers InĬonjunction with the # operator, this provides a convenient means to This macro expands to sequential integral values starting from 0. Which you are using GNU C or GNU Fortran. With the same meanings regardless of the machine or operating system on The common predefined macros are GNU C extensions. Next: System-specific Predefined Macros, Previous: Standard Predefined Macros, Up: Predefined Macros