Module Name: src Committed By: rillig Date: Tue Dec 29 01:45:06 UTC 2020
Modified Files: src/distrib/sets/lists/tests: mi src/usr.bin/make/unit-tests: Makefile Added Files: src/usr.bin/make/unit-tests: directive-export-impl.exp directive-export-impl.mk Log Message: make(1): add test that explains how variables are exported Exporting the variables at the right time and with the correct values is a subtle issue. The current implementation carefully marks variables as ready to be exported, then exports them and at the same time tries to export as few variables as possible, to avoid memory leaks. This test describes and explains how all this works in detail. This test also justifies that the call to Var_ReexportVars happens in the make process itself, not in the child processes, no matter whether these are created with vfork or (only theoretically) with plain fork. This has changed in compat.c 1.217, job.c 1.390 and main.c 1.504 from 2020-12-27. To generate a diff of this commit: cvs rdiff -u -r1.999 -r1.1000 src/distrib/sets/lists/tests/mi cvs rdiff -u -r1.257 -r1.258 src/usr.bin/make/unit-tests/Makefile cvs rdiff -u -r0 -r1.1 src/usr.bin/make/unit-tests/directive-export-impl.exp \ src/usr.bin/make/unit-tests/directive-export-impl.mk Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.