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.
When checking for invalid environment variable names we searched the
entire name string instead of just the first LENGTH chars; this could
cause us to incorrectly decide the variable was not exportable.
Dmitry Goncharov <dgoncharov@users.sf.net> found this bug and
provided a test case and sample fix: I used the test but chose a
slightly different fix.
* src/variable.c (define_variable_in_set): check the variable name
not the input string.
* tests/scripts/features/targetvars: Ensure environment variable
values are exported.
The "[" link may be missing during OS boostrapping.
* build.sh: Convert "[ ... ]" to "test ..."
* maintMakefile: Ditto.
* scripts/copyright-update: Ditto
* tests/scripts/features/reinvoke: Ditto
* tests/scripts/features/targetvars: Ditto
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
This reverts commit 6264deece3.
Further investigation discovers that the real issue is that
GNU Emacs compile mode doesn't have a matching regex for GNU
make error messages generated when targets fail. I submitted
a patch to GNU Emacs adding a matcher for compile mode.
When using exec we install the child's environment before invoking
execlp(), so commands are found on the child's PATH. posix_spawnp
searches on the parent's PATH, which we don't want.
Import gnulib's findprog-in module and use it to search the child's
PATH, then use posix_spawn() to run it.
Also, posix_spawn() does not fall back to trying sh on ENOEXEC, as
execlp() does, so implement that as well.
* bootstrap.conf: Add the findprog-in gnulib module
* src/job.c: Include findprog.h if we're using posix_spawn.
(start_job_command): Remove the handling of child->cmd_name,
(child_execute_job): and add it here. Look up the command to be
run in the child's path and invoke it if found. If it fails with
ENOEXEC then retry it as an argument to the default shell.
* tests/scripts/misc/general4: Test makefile PATH assignments.
* tests/scripts/features/targetvars: Ditto, for target variables.
* main.c (main): Sanitize program name detection on Windows.
* makeint.h: 'program' is a const string on all platforms now.
* tests/run_make_tests.bat: Windows bat file to invoke tests
* tests/test_driver.pl: Obtain system-specific error messages.
(get_osname): Compute the $port_type here. Add more $osname checks
for different Windows Perl ports.
(_run_command): Rewrite the timeout capability to work properly
with Windows. Don't use Perl fork/exec; instead use system(1,...)
which allows a more reliable/proper kill operation.
Also, allow options to be given as a list instead of a string, to
allow more complex quoting of command-line arguments.
* tests/run_make_tests.pl (run_make_with_options): Allow options
to be provided as a list in addition to a simple string.
(set_more_defaults): Write sample makefiles and run make on them
instead of trying to run echo and invoking make with -f-, to avoid
relying on shell and echo to get basic configuration values. Also
create a $sh_name variable instead of hard-coding /bin/sh.
* tests/scripts/features/archives: Skip on Windows.
* tests/scripts/features/escape: Use list method for passing options.
* tests/scripts/features/include: Use system-specific error messages.
* tests/scripts/features/output-sync: "Command not found" errors
generate very different / odd output on Windows. This needs to be
addressed but for now disable these tests on Windows.
* tests/scripts/functions/abspath: Disable on Windows.
* tests/scripts/functions/file: Use system-specific error messages.
* tests/scripts/functions/shell: "Command not found" errors generate
very different / odd output on Windows. This needs to be addressed
but for now disable these tests on Windows.
* tests/scripts/misc/close_stdout: Disable on Windows.
* tests/scripts/options/dash-k: Use system-specific error messages.
* tests/scripts/options/dash-l: Disable on Windows.
* tests/scripts/options/eval: Use list method for passing options.
* tests/scripts/options/general: Skip some non-portable tests.
* tests/scripts/targets/ONESHELL: Skip some non-portable tests.
* tests/scripts/targets/POSIX: Skip some non-portable tests.
* tests/scripts/variables/MAKEFILES: Skip some non-portable tests.
* tests/scripts/variables/SHELL: Use a makefile not -f- for testing.
Implemented enhancement #1391: allow "export" in target-specific
variable definitions.
Change the Info name of the "Automatic" node to "Automatic Variables".
Add text clarifying the scope of automatic variables to that section.
