954401e68e
Merge commit '308a28d6cd2e87028e535eabccb89a9dc2fd9515'
48 lines
1.6 KiB
Makefile
48 lines
1.6 KiB
Makefile
# $NetBSD: deptgt-begin.mk,v 1.6 2022/05/07 08:01:20 rillig Exp $
|
|
#
|
|
# Tests for the special target .BEGIN in dependency declarations,
|
|
# which is a container for commands that are run before any other
|
|
# commands from the shell lines.
|
|
|
|
.BEGIN:
|
|
: $@
|
|
|
|
# To register a custom action to be run at the beginning, the simplest way is
|
|
# to directly place some commands on the '.BEGIN' target. This doesn't scale
|
|
# though, since the ':' dependency operator prevents that any other place may
|
|
# add its commands after this.
|
|
#
|
|
# There are several ways to resolve this situation, which are detailed below.
|
|
.BEGIN:
|
|
: Making another $@.
|
|
|
|
# One way to run commands at the beginning is to define a custom target and
|
|
# make the .BEGIN depend on that target. This way, the commands from the
|
|
# custom target are run even before the .BEGIN target.
|
|
.BEGIN: before-begin
|
|
before-begin: .PHONY .NOTMAIN
|
|
: Making $@ before .BEGIN.
|
|
|
|
# Another way is to define a custom target and make that a .USE dependency.
|
|
# For the .BEGIN target, .USE dependencies do not work though, since in
|
|
# Compat_MakeAll, the .USE and .USEBEFORE nodes are expanded right after the
|
|
# .BEGIN target has been made, which is too late.
|
|
.BEGIN: use
|
|
use: .USE .NOTMAIN
|
|
: Making $@ from a .USE dependency.
|
|
|
|
# Same as with .USE, but run the commands before the main commands from the
|
|
# .BEGIN target.
|
|
#
|
|
# For the .BEGIN target, .USEBEFORE dependencies do not work though, since in
|
|
# Compat_MakeAll, the .USE and .USEBEFORE nodes are expanded right after the
|
|
# .BEGIN target has been made, which is too late.
|
|
.BEGIN: use-before
|
|
use-before: .USEBEFORE .NOTMAIN
|
|
: Making $@ from a .USEBEFORE dependency.
|
|
|
|
all:
|
|
: $@
|
|
|
|
_!= echo : parse time 1>&2
|