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# $NetBSD: deptgt-begin.mk,v 1.7 2023/06/01 20:56:35 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.
# expect+2: warning: using previous script for ".BEGIN" defined here
.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.
# expect+2: warning: duplicate script for target ".BEGIN" ignored
.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
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