1 # $NetBSD: posix-varassign.mk,v 1.1 2025/04/13 09:29:33 rillig Exp $ 2 # 3 # https://pubs.opengroup.org/onlinepubs/9799919799/utilities/make.html#tag_20_76_13_05 4 # 5 # Test that variable assignments work in the same way as in default mode. 6 # 7 # The assignment operators "::=" and ":::=" are intentionally not supported, 8 # as they would introduce the distinction between eagerly and lazily evaluated 9 # macros, in addition to the eagerly and lazily evaluated assignments, and 10 # this would add too much complexity to the user's mental model, for too 11 # little benefit. 12 13 .POSIX: 14 15 16 VAR= value 17 .if ${VAR} != "value" 18 . error 19 .endif 20 21 22 # Deviation from POSIX: The "::=" assignment operator is not supported, 23 # instead, the variable named "VAR:" is defined. 24 VAR= before 25 VAR::= posix-immediate-expansion 26 .if ${VAR} != "before" 27 . error 28 .elif ${${:UVAR\:}} != "posix-immediate-expansion" 29 . error 30 .endif 31 32 33 # Deviation from POSIX: The ":::=" assignment operator is not supported, 34 # instead, the variable named "VAR::" is defined. 35 VAR:::= posix-delayed-expansion 36 .if ${VAR} != "before" 37 . error 38 .elif ${${:UVAR\:\:}} != "posix-delayed-expansion" 39 . error 40 .endif 41 42 43 VAR!= echo from shell command 44 .if ${VAR} != "from shell command" 45 . error 46 .endif 47 48 49 VAR= value 50 VAR?= fallback 51 .if ${VAR} != "value" 52 . error 53 .endif 54 .undef VAR 55 VAR?= fallback 56 .if ${VAR} != "fallback" 57 . error 58 .endif 59 60 61 VAR= value 62 VAR+= appended 63 .if ${VAR} != "value appended" 64 . error 65 .endif 66 67 68 # In POSIX mode, the ":=" assignment operator is available as well, even 69 # though it is not specified by POSIX, due to the differences in existing 70 # make implementations. 71 REF= before 72 VAR:= immediate ${REF} 73 REF= after 74 .if ${VAR} != "immediate before" 75 . error 76 .endif 77 78 79 all: 80
Indexes created Sat Sep 20 22:09:52 GMT 2025