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What does export do in Makefile?

Contents
  1. What is export file in Linux?
  2. What is := in makefile?
  3. How do I pass an environment variable in makefile?
  4. What is a makefile target?
To pass down, or export, a variable, make adds the variable and its value to the environment for running each command. The sub-make, in turn, uses the environment to initialize its table of variable values. The special variables SHELL and MAKEFLAGS are always exported (unless you unexport them).


What is export file in Linux?

The export command is a built-in utility of Linux Bash shell. It is used to ensure the environment variables and functions to be passed to child processes. It does not affect the existing environment variable. Environment variables are set when we open a new shell session.

What is := in makefile?

Expanded assignment = defines a recursively-expanded variable. := defines a simply-expanded variable.

How do I pass an environment variable in makefile?

How to Pass Environment Variables to Makefiles in Subdirectories1# /Makefile build-client: cd client && $(MAKE) build.2# /client/Makefile build: docker build -t client .3# .env HOSTNAME=localhost PORT=3000.4# /Makefile include .env build-client: export URI=$(HOSTNAME):$(PORT) && \ cd client && $(MAKE) build.

What is a makefile target?

A simple makefile consists of “rules” with the following shape: target … : prerequisites … recipe … … A target is usually the name of a file that is generated by a program; examples of targets are executable or object files. A target can also be the name of an action to carry out, such as ' clean ' (see Phony Targets).

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