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This allows exporting variables only for some target. It will allow not exporting variables when not needed, and so prevent unnecessary evaluation.
20 lines
650 B
Makefile
20 lines
650 B
Makefile
# Utilities to set variables and environment for targets
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# These functions should help replacing immediate evaluation and global 'export'
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# Target specific export the variables for that target
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#
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# target-export-variables <target> <variables>
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#
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# Parameters
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# target: name of target
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# variables: the variables to export
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#
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# The variable will only be evaluated when executing the target as when
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# doing export
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target-export-variables = $(foreach var,$(2),$(call _target-export-variable,$1,$(var)))
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# '$1: export $2' cannot be used alone
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# By using '?=' the variable is evaluated at runtime only
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_target-export-variable = $(eval $1: export $2?=)
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