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Rewrite the environment variable algorithm to correctly inherit
export settings from parent variable sets. The new algorithm
for computing the table of environment variables is:
- Start with the most local variable set and proceed to global.
- If the variable already exists in the table and we don't know
its export status, update it with the current variable's status.
- If the variable is not in the table and it's not global, add it
regardless of its status so if it's unexported we remember that.
- If the variable is not in the table and is global, check its
export status and don't add it if we won't export it.
Then when generating the environment variables, check the export
status of each variable in case it was a target-specific variable
and we have determined it should not be exported.
Rework SHELL handling to check at the end whether we added it or
not and if we didn't, add the value from the environment.
* NEWS: Announce support for target-specific "unexport"."
* doc/make.texi (Target-specific): Document the support.
* src/variable.h (enum variable_export): Make into a global type.
* src/read.c (struct vmodifiers): Use enum variable_export rather
than individual booleans.
(parse_var_assignment): Parse the "unexport" keyword.
(eval): Remember the vmodifier value in the variable.
(record_target_var): Ditto.
* src/variable.c (should_export): Check if the variable should be
exported.
(target_environment): Implement the above algorithm.
* tests/scripts/features/export: Test export/unexport with variable
assignments on the same line.
* tests/scripts/features/targetvars: Add a comprehensive suite of
tests for different types of target-specific export / unexport.
* tests/scripts/variables/SHELL: Update the comment.
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Rather than having an %extraENV that is added to the default %ENV
and resetting %ENV _before_ each test, allow the test setup to
modify %ENV directly as needed then reset %ENV _after_ each test.
* tests/test_driver.pl: Remove unused %extraENV.
(resetENV): Don't add in %extraENV.
(_run_command): Reset after we run the command rather than before.
* tests/scripts/features/export: Convert %extraENV to %ENV
* tests/scripts/features/jobserver: Ditto
* tests/scripts/features/parallelism: Ditto
* tests/scripts/features/targetvars: Ditto
* tests/scripts/functions/eval: Ditto
* tests/scripts/functions/foreach: Ditto
* tests/scripts/functions/origin: Ditto
* tests/scripts/misc/general4: Ditto
* tests/scripts/options/dash-e: Ditto
* tests/scripts/targets/POSIX: Ditto
* tests/scripts/variables/GNUMAKEFLAGS: Ditto
* tests/scripts/variables/SHELL: Ditto
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Rework the parser for variables to allow multiple modifiers and also
allow for variables and targets with modifier names, like "export" and
"private".
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Update the text about reporting bugs.
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* Never use "touch" in make rules; it breaks on most sub-second
supporting systems. Use echo "" > $@ instead.
* Forgot to close test makefiles before using them!
All the above worked fine on Linux but failed miserably on Solaris.
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Fix bug #103: allow ifdef, export, and unexport to expand their arguments.
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