What are compiler macros?

What are compiler macros?

A macro is a fragment of code which has been given a name. Whenever the name is used, it is replaced by the contents of the macro. However, the preprocessor operator defined (see Defined) can never be defined as a macro, and C++’s named operators (see C++ Named Operators) cannot be macros when you are compiling C++.

What are the most common predefined macros?

The common predefined macros are GNU C extensions.

What are the standard predefined macros?

Standard predefined macros

• __cplusplus Defined as an integer literal value when the translation unit is compiled as C++.
• __DATE__ The compilation date of the current source file.
• __FILE__ The name of the current source file.
• __LINE__ Defined as the integer line number in the current source file.

What are the standard predefined macros in C?

According to C89 Standard, C programming language has following predefined macros:

• __LINE__ Macro: __LINE__ macro contains the current line number of the program in the compilation.
• __FILE__ Macro: __FILE__ macro holds the file name of the currently executing program in the computer.

Is _WIN32 defined for x64?

_WIN32 and WIN64 The symbol _WIN32 is defined by the compiler to indicate that this is a (32bit) Windows compilation. Unfortunately, for historical reasons, it is also defined for 64-bit compilation. The symbol _WIN64 is defined by the compiler to indicate that this is a 64-bit Windows compilation.

Does clang define __ GNUC __?

__GNUC__ doesn’t mean GCC specifically. All compilers that support GNU C extensions define it, including clang and ICC. The Clang front-end defines __clang__ , but other front-ends that use the LLVM back-end also define __llvm__ (e.g. IBM XL C/C++ versions 13.1.

What are standard macros?

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What does __ LINE __ return?

The __LINE__ This macro can find the current line number in source file. This line number is an integer value.

What is __ LINE __ in C?

__LINE__ is a preprocessor macro that expands to current line number in the source file, as an integer. __LINE__ is useful when generating log statements, error messages intended for programmers, when throwing exceptions, or when writing debugging code.