1# $NetBSD: directive-export-gmake.mk,v 1.3 2020/11/17 20:16:44 rillig Exp $ 2# 3# Tests for the export directive (without leading dot), as in GNU make. 4 5# The "export" directive only affects the environment of the make process 6# and its child processes. It does not affect the global variables or any 7# other variables. 8VAR= before 9export VAR=exported 10.if ${VAR} != "before" 11. error 12.endif 13 14# Ensure that the name-value pair is actually exported. 15.if ${:!echo "\$VAR"!} != "exported" 16. error 17.endif 18 19# This line looks like it would export 2 variables, but it doesn't. 20# It only exports VAR and appends everything else as the variable value. 21export VAR=exported VAR2=exported-as-well 22.if ${:!echo "\$VAR"!} != "exported VAR2=exported-as-well" 23. error ${:!echo "\$VAR"!} 24.endif 25 26# Contrary to the usual variable assignments, spaces are significant 27# after the '=' sign and are prepended to the value of the environment 28# variable. 29export VAR= leading spaces 30.if ${:!echo "\$VAR"!} != " leading spaces" 31. error 32.endif 33 34# Contrary to the usual variable assignments, spaces are significant 35# before the '=' sign and are appended to the name of the environment 36# variable. 37# 38# Depending on the shell, environment variables with such exotic names 39# may be silently discarded. One such shell is dash, which is the default 40# shell on Ubuntu and Debian. 41export VAR =trailing space in varname 42.if ${:!env | grep trailing || true!} != "VAR =trailing space in varname" 43. if ${:!env | grep trailing || true!} != "" # for dash 44. error 45. endif 46.endif 47 48# The right-hand side of the exported variable is expanded exactly once. 49TWICE= expanded twice 50ONCE= expanded once, leaving $${TWICE} as-is 51export VAR=${ONCE} 52.if ${:!echo "\$VAR"!} != "expanded once, leaving \${TWICE} as-is" 53. error 54.endif 55 56# Undefined variables are allowed on the right-hand side, they expand 57# to an empty string, as usual. 58export VAR=an ${UNDEF} variable 59.if ${:!echo "\$VAR"!} != "an variable" 60. error 61.endif 62 63all: 64 @:; 65