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This commit back-patches the v12-era commits a73d08319, cc92cca43,
and 7570df0f3 into supported pre-v12 branches. The net effect is to
eliminate our former dependency on the never-standard sys_siglist[]
array, instead using POSIX-standard strsignal(3).
What motivates doing this now is that glibc just removed sys_siglist[]
from the set of symbols available to newly-built programs. While our
code can survive without sys_siglist[], it then fails to print any
description of the signal that killed a child process, which is a
non-negligible loss of friendliness. We can expect that people will
be wanting to build the back branches on platforms that include this
change, so we need to do something.
Since strsignal(3) has existed for quite a long time, and we've not
had any trouble with these patches so far in v12, it seems safe to
back-patch into older branches.
Discussion: https://postgr.es/m/3179114.1594853308@sss.pgh.pa.us
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Backpatch certain files through 9.1
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Backpatch certain files through 9.0
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Update all files in head, and files COPYRIGHT and legal.sgml in all back
branches.
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Continuing 63f32f3416a8b4f8e057dc184e8e8eae734ccc8a, libpgcommon should
depend on libpgport, but not vice versa. But wait_result_to_str() in
wait_error.c depends on pstrdup() in libpgcommon. So move exec.c and
wait_error.c from libpgport to libpgcommon. Also switch the link order
in the place that's actually used by the failing ecpg builds.
The function declarations have been left in port.h for now. That should
perhaps be separated sometime.
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