45 lines
1.1 KiB
Makefile
45 lines
1.1 KiB
Makefile
# $NetBSD: directive-export.mk,v 1.8 2021/02/16 19:01:18 rillig Exp $
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#
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# Tests for the .export directive.
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#
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# See also:
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# directive-misspellings.mk
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# TODO: Implementation
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INDIRECT= indirect
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VAR= value $$ ${INDIRECT}
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# Before 2020-12-13, this unusual expression invoked undefined behavior since
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# it accessed out-of-bounds memory via Var_Export -> ExportVar -> MayExport.
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.export ${:U }
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# A variable is exported using the .export directive.
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# During that, its value is expanded, just like almost everywhere else.
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.export VAR
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.if ${:!env | grep '^VAR'!} != "VAR=value \$ indirect"
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. error
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.endif
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# Undefining a variable that has been exported implicitly removes it from
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# the environment of all child processes.
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.undef VAR
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.if ${:!env | grep '^VAR' || true!} != ""
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. error
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.endif
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# No syntactical argument means to export all variables.
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.export
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# An empty argument means no additional variables to export.
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.export ${:U}
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# Trigger the "This isn't going to end well" in ExportVarEnv.
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EMPTY_SHELL= ${:sh}
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.export EMPTY_SHELL # only marked for export at this point
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_!= :;: # Force the variable to be actually exported.
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all:
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