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makefiles/utils: function to export variables for a target

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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.
This commit is contained in:
Gaëtan Harter 2019-05-17 11:41:58 +02:00
parent b9c15c3084
commit fcf8c4782d
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GPG Key ID: 76DF6BCF1B1F883B
3 changed files with 43 additions and 1 deletions
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19
makefiles/utils/test-variables.mk Normal file
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@ -0,0 +1,19 @@
include variables.mk
# Timestamp in nanoseconds (to be an integer)
# OSx 'date' does not support 'date +%s%N' so rely on python instead
# It could be OSx specific but we do not have 'OS' defined here to differentiate
date_nanoseconds = $(shell python -c 'import time; print(int(time.time() * 1000000000))')
EXPORTED_VARIABLES = MY_VARIABLE CURRENT_TIME
MY_VARIABLE = my_variable
# Defered evaluation to the test
CURRENT_TIME = $(call date_nanoseconds)
$(call target-export-variables,test-exported-variables,$(EXPORTED_VARIABLES))
test-exported-variables:
$(Q)bash -c 'test "$(MY_VARIABLE)" = "$${MY_VARIABLE}" || { echo ERROR: "$(MY_VARIABLE)" != "$${MY_VARIABLE}"; exit 1; }'
$(Q)bash -c 'test $(PARSE_TIME) -lt $${CURRENT_TIME} || { echo ERROR: $(PARSE_TIME) \>= $${CURRENT_TIME} >&2; exit 1; }'
# Immediate evaluation for comparing
PARSE_TIME := $(call date_nanoseconds)

19
makefiles/utils/variables.mk Normal file
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@ -0,0 +1,19 @@
# Utilities to set variables and environment for targets
# These functions should help replacing immediate evaluation and global 'export'
# Target specific export the variables for that target
#
# target-export-variables <target> <variables>
#
# Parameters
# target: name of target
# variables: the variables to export
#
# The variable will only be evaluated when executing the target as when
# doing export
target-export-variables = $(foreach var,$(2),$(call _target-export-variable,$1,$(var)))
# '$1: export $2' cannot be used alone
# By using '?=' the variable is evaluated at runtime only
_target-export-variable = $(eval $1: export $2?=)

6
tests/build_system_utils/Makefile
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@ -16,7 +16,8 @@ endef
MAKEFILES_UTILS = $(RIOTMAKE)/utils
COMPILE_TESTS = test-ensure_value test-ensure_value-negative
COMPILE_TESTS += test-ensure_value test-ensure_value-negative
COMPILE_TESTS += test-exported-variables
# Tests will be run both in the host machine and in `docker`
all: build-system-utils-tests
@ -31,3 +32,6 @@ test-ensure_value:
test-ensure_value-negative:
$(Q)$(call command_should_fail,"$(MAKE)" -C $(MAKEFILES_UTILS) -f test-checks.mk test-ensure_value-negative)
test-exported-variables:
$(Q)$(call command_should_succeed,"$(MAKE)" -C $(MAKEFILES_UTILS) -f test-variables.mk test-exported-variables)