Linking with 'ld -b' fails with 64-bit using Itanium HP compiler

[datalogics-robb]

BPO	30819
Nosy	@vstinner, @datalogics-robb, @iritkatriel
PRs	bpo-30183: Modify configure to link with the compiler driver under HP-UX #2519

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2022-01-17.23:00:06.604>
created_at = <Date 2017-06-30.16:56:50.053>
labels = ['build', '3.7']
title = "Linking with 'ld -b' fails with 64-bit using Itanium HP compiler"
updated_at = <Date 2022-01-17.23:00:06.602>
user = 'https://github.com/datalogics-robb'

bugs.python.org fields:

activity = <Date 2022-01-17.23:00:06.602>
actor = 'iritkatriel'
assignee = 'none'
closed = True
closed_date = <Date 2022-01-17.23:00:06.604>
closer = 'iritkatriel'
components = ['Build']
creation = <Date 2017-06-30.16:56:50.053>
creator = 'Robert Boehne'
dependencies = []
files = []
hgrepos = []
issue_num = 30819
keywords = []
message_count = 2.0
messages = ['297432', '410829']
nosy_count = 3.0
nosy_names = ['vstinner', 'Robert Boehne', 'iritkatriel']
pr_nums = ['2519']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue30819'
versions = ['Python 3.7']

[datalogics-robb]

Setting compiler flags to +DD64 produces 64-bit objects, but the linker does not understand this flag, so either you'll see an ld failure to recognize +DD64 at link time, or you'll see a failure later mixing 32 and 64-bit objects.

I also modified the C++ variable because that's obviously needed as well.
There was an issue with configure - after modifying one and adding another line in configure.ac, autoconf 2.69 removed all instances of "runstatedir" in the generated configure script, so I made my intended change to configure in an editor as well.

[iritkatriel]

Robert's PR was merged so I'm assuming this is fixed. Reopen or create a new issue if not.