1# $NetBSD: deptgt.mk,v 1.14 2023/06/01 20:56:35 rillig Exp $ 2# 3# Tests for special targets like .BEGIN or .SUFFIXES in dependency 4# declarations. 5 6# TODO: Implementation 7 8# Just in case anyone tries to compile several special targets in a single 9# dependency line: That doesn't work, and make immediately rejects it. 10# expect+1: warning: Extra target '.PHONY' ignored 11.SUFFIXES .PHONY: .c.o 12 13# The following lines demonstrate how 'targets' is set and reset during 14# parsing of dependencies. To see it in action, set breakpoints in: 15# 16# ParseDependency at the beginning 17# FinishDependencyGroup at "targets = NULL" 18# Parse_File at "Lst_Free(targets)" 19# Parse_File at "targets = Lst_New()" 20# ParseLine_ShellCommand at "targets == NULL" 21# 22# Keywords: 23# parse.c:targets 24 25target1 target2: sources # targets := [target1, target2] 26 : command1 # targets == [target1, target2] 27 : command2 # targets == [target1, target2] 28VAR=value # targets := NULL 29# expect+1: Unassociated shell command ": command3 # parse error, since targets == NULL" 30 : command3 # parse error, since targets == NULL 31 32# In a dependency declaration, the list of targets can be empty. 33# It doesn't matter whether the empty string is generated by a variable 34# expression or whether it is just omitted. 35.MAKEFLAGS: -dp 36${:U}: empty-source 37 : command for empty targets list 38: empty-source 39 : command for empty targets list 40.MAKEFLAGS: -d0 41 42# Just to show that a malformed expression is only expanded once in 43# ParseDependencyTargetWord. The only way to produce an expression that 44# is well-formed on the first expansion and ill-formed on the second 45# expansion would be to use the variable modifier '::=' to modify the 46# targets. This in turn would be such an extreme and unreliable edge case 47# that nobody uses it. 48# expect+1: Unknown modifier "Z" 49$$$$$$$${:U:Z}: 50 51# expect+1: warning: Extra target 'ordinary' ignored 52.END ordinary: 53 54# expect+1: warning: Extra target (ordinary) ignored 55.PATH ordinary: 56 57# expect+1: Special and mundane targets don't mix. Mundane ones ignored 58ordinary .PATH: 59 60all: 61 @:; 62