CVS commit: src

["Roland Illig" <rillig%netbsd.org@localhost>]

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.