Makefile Variables -


makefile variable assignment

makefile documentation: Conditional Variable Assignment. makefile documentation: Conditional Variable Assignment. RIP Tutorial. en English (en) Français (fr) Español (es) Italiano (it) Deutsch (de) русский (ru) 한국어 (ko) 日本語 (ja) 中文简体 (zh-CN) 中文繁體 (zh-TW). In trying to test for the failure of a command in a Makefile (in this case jekyll build relative), the variable $$? should contain the exit code of the last command. In testing, this code is shown to be However, I would like to assign it to the variable LAST_EXIT so that an the next if statement can check whether the executed command succeeded or failed. Dynamic Makefile variable assignment. Ask Question Asked 7 years, 6 months ago. Active 7 years, 6 months ago. Viewed 4k times 2. 1. I have the following Makefile and I want to create "debug" and "optimal" targets which affect the values in CPPFLAGS and CFLAGS, like so: include DIRS = applib EXE_APPFS = appfs EXE_APPMOUNT = appmount.

How to assign value to variable in Makefile? - Stack Overflow

These values are substituted by explicit request into targets, prerequisites, recipes, and other parts of the makefile.

In some other versions of makevariables are called macros. Variables can represent lists of file names, options to pass to compilers, makefile variable assignment, programs to run, directories to look in for source files, directories to write output in, or anything else you can imagine. However, variable names containing characters other than letters, numbers, and underscores should be considered carefully, as in some shells they cannot be passed through the environment to a sub- make see Communicating Variables to a Sub- make.

Variable names are case-sensitive. It is traditional to use upper case letters in variable names, but we recommend using lower case letters for variable names that serve internal purposes in the makefile, and reserving upper case for parameters that control implicit rules or for parameters that the user should override with command options makefile variable assignment Overriding Variables.

A few variables have names that are a single punctuation character or just a few characters. These are the automatic variablesand they have particular specialized uses. See Automatic Variables. How to append more text to the old value of a variable. How to set a variable in the makefile even if the user has set it with a command argument. An alternate way to set a variable to a multi-line string. How to undefine a variable so that it appears as if it was never set.

Variable values can be defined makefile variable assignment a per-target basis. Target-specific variable values can be applied to a group of targets that match a pattern, makefile variable assignment.


Dynamic Makefile variable assignment - Stack Overflow


makefile variable assignment


How to Use Variables. A variable is a name defined in a makefile to represent a string of text, called the variable's values are substituted by explicit request into targets, prerequisites, commands, and other parts of the makefile. (In some other versions of make, variables are called macros.) Variables and functions in all parts of a makefile are expanded when read, except for in recipes, the right-hand sides of variable definitions using ‘=’, and the bodies of variable definitions using the define directive. All variables that appear within the variable-assignment are evaluated within the context of the target: thus, any previously-defined target-specific variable values will be in effect. Note that this variable is actually distinct from any “global” value: the two variables .