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several methods of pass/export variable from top/parent make/makefile to sub/child make/makefile

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several methods of pass/export variable from top/parent make/makefile to sub/child make/makefile

1.
test_value=1234567
export test_value

some_target:
 make -f sub_makefile.mak

2.
test_value = 1234567

some_target:
 export test_value=$(test_value);
 make -f sub_makefile.mak

———-this method equal to———-
#test_value = 1234567

some_target:
 test_value = 1234567; export test_value;
 make -f sub_makefile.mak

3.
some_target:
 make -f sub_makefile.mak test_value = 1234567

——————————————————————

note:
in makefile:
“export test_value=1234567”
is equal to
“test_value=1234567
export test_value”

转载请注明:在路上 » several methods of pass/export variable from top/parent make/makefile to sub/child make/makefile

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