title	Command Macros and Options Macros | Microsoft Docs
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Command Macros and Options Macros

Command macros are predefined for Microsoft products. Options macros represent options to these products and are undefined by default. Both are used in predefined inference rules and can be used in description blocks or user-defined inference rules. Command macros can be redefined to represent part or all of a command line, including options. Options macros generate a null string if left undefined.

Microsoft product	Command macro	Defined as	Options macro
Macro Assembler	AS	ml	AFLAGS
Basic Compiler	BC	bc	BFLAGS
C Compiler	CC	cl	CFLAGS
C++ Compiler	CPP	cl	CPPFLAGS
C++ Compiler	CXX	cl	CXXFLAGS
Resource Compiler	RC	rc	RFLAGS

See Also

Special NMAKE Macros