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make(1): document the selection of the main target

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This commit is contained in:
rillig 2020-11-22 19:37:27 +00:00
parent 7be3276869
commit 43adeab6ec
4 changed files with 70 additions and 2 deletions
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4
distrib/sets/lists/tests/mi
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@ -1,4 +1,4 @@
# $NetBSD: mi,v 1.971 2020/11/21 10:32:42 rillig Exp $
# $NetBSD: mi,v 1.972 2020/11/22 19:37:27 rillig Exp $
#
# Note: don't delete entries from here - mark them as "obsolete" instead.
#
@ -4851,6 +4851,8 @@
./usr/tests/usr.bin/make/unit-tests/cond-func-empty.mk tests-usr.bin-tests compattestfile,atf
./usr/tests/usr.bin/make/unit-tests/cond-func-exists.exp tests-usr.bin-tests compattestfile,atf
./usr/tests/usr.bin/make/unit-tests/cond-func-exists.mk tests-usr.bin-tests compattestfile,atf
./usr/tests/usr.bin/make/unit-tests/cond-func-make-main.exp tests-usr.bin-tests compattestfile,atf
./usr/tests/usr.bin/make/unit-tests/cond-func-make-main.mk tests-usr.bin-tests compattestfile,atf
./usr/tests/usr.bin/make/unit-tests/cond-func-make.exp tests-usr.bin-tests compattestfile,atf
./usr/tests/usr.bin/make/unit-tests/cond-func-make.mk tests-usr.bin-tests compattestfile,atf
./usr/tests/usr.bin/make/unit-tests/cond-func-target.exp tests-usr.bin-tests compattestfile,atf

3
usr.bin/make/unit-tests/Makefile
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@ -1,4 +1,4 @@
# $NetBSD: Makefile,v 1.216 2020/11/22 18:44:10 rillig Exp $
# $NetBSD: Makefile,v 1.217 2020/11/22 19:37:27 rillig Exp $
#
# Unit tests for make(1)
#
@ -58,6 +58,7 @@ TESTS+= cond-func-defined
TESTS+= cond-func-empty
TESTS+= cond-func-exists
TESTS+= cond-func-make
TESTS+= cond-func-make-main
TESTS+= cond-func-target
TESTS+= cond-late
TESTS+= cond-op

3
usr.bin/make/unit-tests/cond-func-make-main.exp Normal file
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@ -0,0 +1,3 @@
: Making dot-main-target-1a.
: Making dot-main-target-1b.
exit status 0

62
usr.bin/make/unit-tests/cond-func-make-main.mk Normal file
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@ -0,0 +1,62 @@
# $NetBSD: cond-func-make-main.mk,v 1.1 2020/11/22 19:37:27 rillig Exp $
#
# Test how accurately the make() function in .if conditions reflects
# what is actually made.
#
# There are several ways to specify what is being made:
#
# 1. The default main target is the first target in the given makefiles that
# is not one of the special targets. For example, .PHONY is special when
# it appears on the left-hand side of the ':'. It is not special on the
# right-hand side though.
#
# 2. Command line arguments that are neither options (-ds or -k) nor variable
# assignments (VAR=value) are interpreted as targets to be made. These
# override the default main target from above.
#
# 3. All sources of the first '.MAIN: sources' line. Any further .MAIN line
# is treated as if .MAIN were a regular name.
#
# This test only covers items 1 and 3. For item 2, see cond-func-make.mk.
first-main-target:
: Making ${.TARGET}.
# Even though the main-target would actually be made at this point, it is
# ignored by the make() function.
.if make(first-main-target)
. error
.endif
# Declaring a target via the .MAIN dependency adds it to the targets to be
# created (opts.create), but only that list was empty at the beginning of
# the line. This implies that several main targets can be set at the name
# time, but they have to be in the same dependency group.
#
# See ParseDoDependencyTargetSpecial, branch SP_MAIN.
.MAIN: dot-main-target-1a dot-main-target-1b
.if !make(dot-main-target-1a)
. error
.endif
.if !make(dot-main-target-1b)
. error
.endif
dot-main-target-{1,2}{a,b}:
: Making ${.TARGET}.
# At this point, the list of targets to be made (opts.create) is not empty
# anymore. ParseDoDependencyTargetSpecial therefore treats the .MAIN as if
# it were an ordinary target. Since .MAIN is not listed as a dependency
# anywhere, it is not made.
.if target(.MAIN)
. error
.endif
.MAIN: dot-main-target-2a dot-main-target-2b
.if !target(.MAIN)
. error
.endif
.if make(dot-main-target-2a)
. error
.endif