1# $NetBSD: directive-export.mk,v 1.10 2023/11/19 09:45:19 rillig Exp $ 2# 3# Tests for the .export directive. 4# 5# See also: 6# directive-misspellings.mk 7 8# TODO: Implementation 9 10INDIRECT= indirect 11VAR= value $$ ${INDIRECT} 12 13# Before 2020-12-13, this unusual expression invoked undefined behavior since 14# it accessed out-of-bounds memory via Var_Export -> ExportVar -> MayExport. 15.export ${:U } 16 17# A variable is exported using the .export directive. 18# During that, its value is expanded, just like almost everywhere else. 19.export VAR 20.if ${:!env | grep '^VAR'!} != "VAR=value \$ indirect" 21. error 22.endif 23 24# Undefining a variable that has been exported implicitly removes it from 25# the environment of all child processes. 26.undef VAR 27.if ${:!env | grep '^VAR' || true!} != "" 28. error 29.endif 30 31# No syntactical argument means to export all variables. 32.export 33 34# An empty argument means no additional variables to export. 35.export ${:U} 36 37 38# Before a child process is started, whether for the '!=' assignment operator 39# or for the ':sh' modifier, all variables that were marked for being exported 40# are expanded and then exported. If expanding such a variable requires 41# running a child command, the marked-as-exported variables would need to be 42# exported first, ending in an endless loop. To avoid this endless loop, 43# don't export the variables while preparing a child process, see 44# ExportVarEnv. 45EMPTY_SHELL= ${:sh} 46.export EMPTY_SHELL # only marked for export at this point 47_!= :;: # Force the variable to be actually exported. 48 49 50# If the '.export' directive exports a variable whose value contains a '$', 51# the actual export action is deferred until a subprocess is started, assuming 52# that only subprocesses access the environment variables. The ':localtime' 53# modifier depends on the 'TZ' environment variable, without any subprocess. 54export TZ=${UTC} 55# expect+1: 00:00:00 56.info ${%T:L:localtime=86400} 57INDIRECT_TZ= ${:UAmerica/Los_Angeles} 58TZ= ${INDIRECT_TZ} 59.export TZ 60# expect+1: 00:00:00 61.info ${%T:L:localtime=86400} 62_!= echo 'force exporting the environment variables' 63# expect+1: 16:00:00 64.info ${%T:L:localtime=86400} 65 66 67all: 68