Create a struct childbase which is the basics of struct child needed
to invoke child_execute_job(), and can be cast back and forth to a
struct child. Ensure all implementations of child_execute_job() take
the same arguments.
* src/job.h (CHILDBASE): Create a macro to hold the base parts.
(struct childbase): A structure containing CHILDBASE.
(struct child): Use CHILDBASE as the initial part of child.
[VMS]: Remove declaration of VMS version of child_execute_job.
* src/job.c (start_job_command): Use new child_execute_job() call.
(child_execute_job) [__EMX__]: Implement new calling signature.
(child_execute_job): Implement new calling signature.
* src/main.c (main) [__EMX__]: Use new child_execute_job() call.
* src/function.c (func_shell_base): Use new child_execute_job() call.
* src/vmsjobs.c (vmsHandleChildTerm): Accept struct childbase.
* src/vmsjobs.c (child_execute_job): Implement new calling signature.
Modify the return value to be pid_t, not a boolean, and return the
PID rather than setting it in the child. This is OK because our only
caller immediately reset PID to -1 anyway if we return 0.
If we failed to fork() we were essentially exiting make immediately
without respect to ignore flags, etc. On one hand that makes sense
because if you can't fork you're in real trouble, but it doesn't
work so well on systems where we don't fork at all. Instead, treat
a fork error like any other error by delaying the handling until
the next call to reap_children(). Any child with a PID of -1 is
considered to have died before starting so check these first without
waiting for them.
* src/commands.c (fatal_error_signal): Don't kill children that
never started.
* src/function.c (func_shell_base): Handle cleanup properly if the
child doesn't start.
* src/job.c (reap_children): Check for children that died before
starting and handle them without waiting for the PID.
(start_job_command): Free memory when the child doesn't start.
(start_waiting_job): Don't manage children who never started.
(child_execute_job): If the fork fails return PID -1.
* src/vmsjobs.c: Check for children that never started.
* tests/run_make_tests.pl: Parse config.status to get all options.
Move the source code (other than glob) into the "src" subdirectory.
Update all scripting and recommendations to support this change.
* *.c, *.h, w32/*: Move to src/
* configure.ac, Makefile.am, maintMakefile: Locate new source files.
* Basic.mk.template, mk/*: Update for new source file locations.
* NEWS, README.DOS.template: Update for new locations.
* build.template, build_w32.bat, builddos.bat: Ditto.
* po/POTFILES.in: Ditto
* tests/run_make_tests.pl, tests/scripts/features/load*: Ditto.
* make.1: Move to doc.
* mk/VMS.mk: Add support for building on VMS (hopefully).
* makefile.vms, prepare_w32.bat: Remove.
* SCOPTIONS: Update to define HAVE_CONFIG_H
