makefile简单教程（makefile简单教程）.docVIP

makefile简单教程（makefile简单教程） The make tool is the most important and the most basic function is the description file to describe the relationships between the source program and automatically compile maintenance work, and describe the files need to be written in a grammar, need to explain how to compile all source files and links to generate the executable file file, and dependencies between source files, in order to it is more convenient to use, and can use some files in macro definition. The description file contains the contents: (1) notes (2) macro definition (3) explicit rules (4) implicit rules 1. comment and word wrap Comments in makefile is always to the end of the characters to # No. at the beginning, when the nmake tool to these characters, it will completely ignore all the characters and the back of the # no.. When a line is too long, it can be continued with a newline character, and the newline character of makefile is. When using a newline should not be combined with other characters in behind, including comments and blank, otherwise nmake detected not in the last line, it will not be a newline, thus error. 2. macro definition Makefile allows you to use simple macro definitions to refer to source files and their associated compilation information. You can call macros as variables. In the entire description file, macro lines are defined as lines that conform to the following syntax: Variable name = variable content When referencing a macro, you simply add a $sign before the variable, but note that if the variable name is longer than one character, parentheses must be added to the reference (), and the following is a valid macro reference: $(LINK_FLAG) $(EXE) $A $(A) The last two references are exactly the same. 3. explicit rules Makefile contains a number of rules that define dependencies between files and generate commands, a rule format like this: Target file: dependent on the file; command (method 1) or Target file: dependency file (method 2) command Th