安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
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- What do the makefile symbols - and $ lt; mean? - Stack Overflow
The Makefile builds the hello executable if any one of main cpp, hello cpp, factorial cpp changed The smallest possible Makefile to achieve that specification could have been: hello: main cpp hello cpp factorial cpp g++ -o hello main cpp hello cpp factorial cpp pro: very easy to read; con: maintenance nightmare, duplication of the C++ dependencies
- Whats the difference between := and = in Makefile?
Running make with the following Makefile will instantly exit: a = $(shell sleep 3) Running make with the following Makefile will sleep for 3 seconds, and then exit: a := $(shell sleep 3) In the former Makefile, a is not evaluated until it's used elsewhere in the Makefile, while in the latter a is evaluated immediately even though it's not used
- What is ?= in Makefile - Stack Overflow
How to conditionally set Makefile variable to something if it is empty? Related 985
- gnu make - What is the difference between the GNU Makefile variable . . .
If something like HELLO_WORLD = $(HELLO_WORLD) world! were used, recursion would result, which would most likely end the execution of your Makefile If A := $(A) $(B) were used, the result would not be the exact same as using += because B is expanded with := whereas += would not cause B to be expanded
- What does a percent symbol do in a makefile? - Stack Overflow
A makefile is processed sequentially, line by line Variable assignments are "internalized", and include statements cause the contents of other files to be inserted literally at that location after which that content is processed as part of the makefile
- and $ lt; in a makefile mean? - Unix Linux Stack Exchange
From make manpage: $@ is: The file name of the target of the rule If the target is an archive member, then ‘$@’ is the name of the archive file
- what do the -o -f -c and -g etc mean in make?
make -f makefile Specifies a different makefile The argument makefile is a pathname of a description file, which is also referred to as the makefile A pathname of '-' shall denote the standard input There can be multiple instances of this option, and they shall be processed in the order specified
- What are Makefile. am and Makefile. in? - Stack Overflow
Makefile am is a programmer-defined file and is used by automake to generate the Makefile in file (the am stands for automake) The configure script typically seen in source tarballs will use the Makefile in to generate a Makefile The configure script itself is generated from a programmer-defined file named either configure ac or configure in
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