2020-11-20 03:54:37 +00:00
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# $NetBSD: directive-export-gmake.mk,v 1.3 2020/11/17 20:16:44 rillig Exp $
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2020-11-07 19:39:21 +00:00
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#
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# Tests for the export directive (without leading dot), as in GNU make.
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# The "export" directive only affects the environment of the make process
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# and its child processes. It does not affect the global variables or any
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# other variables.
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VAR= before
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export VAR=exported
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.if ${VAR} != "before"
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. error
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.endif
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# Ensure that the name-value pair is actually exported.
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.if ${:!echo "\$VAR"!} != "exported"
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. error
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.endif
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# This line looks like it would export 2 variables, but it doesn't.
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# It only exports VAR and appends everything else as the variable value.
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export VAR=exported VAR2=exported-as-well
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.if ${:!echo "\$VAR"!} != "exported VAR2=exported-as-well"
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. error ${:!echo "\$VAR"!}
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.endif
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# Contrary to the usual variable assignments, spaces are significant
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# after the '=' sign and are prepended to the value of the environment
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# variable.
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export VAR= leading spaces
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.if ${:!echo "\$VAR"!} != " leading spaces"
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. error
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.endif
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# Contrary to the usual variable assignments, spaces are significant
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# before the '=' sign and are appended to the name of the environment
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# variable.
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#
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# Depending on the shell, environment variables with such exotic names
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# may be silently discarded. One such shell is dash, which is the default
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# shell on Ubuntu and Debian.
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export VAR =trailing space in varname
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2020-11-20 03:54:37 +00:00
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.if ${:!env | grep trailing || true!} != "VAR =trailing space in varname"
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. if ${:!env | grep trailing || true!} != "" # for dash
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2020-11-07 19:39:21 +00:00
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. error
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. endif
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.endif
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# The right-hand side of the exported variable is expanded exactly once.
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TWICE= expanded twice
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ONCE= expanded once, leaving $${TWICE} as-is
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export VAR=${ONCE}
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.if ${:!echo "\$VAR"!} != "expanded once, leaving \${TWICE} as-is"
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. error
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.endif
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# Undefined variables are allowed on the right-hand side, they expand
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# to an empty string, as usual.
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export VAR=an ${UNDEF} variable
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.if ${:!echo "\$VAR"!} != "an variable"
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. error
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.endif
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all:
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@:;
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