Update files for Autotools

[gruenich]

Increase required Autotools version to 2.69.
Fixes #994

Please do intense testing, this might have side effects as my tested was limited to my machine.

[RossBencina]

Thanks for this.

Please do intense testing,

Phil and I will test on Mac and Ubuntu prior to merge.

this might have side effects

Is there any documentation regarding backward compatibility for the version of autotools that you used?

as my tested was limited to my machine.

What is your machine?

[RossBencina]

If anyone else can test this now that would be helpful.

[gruenich]

• I tested this change on openSuse Tumbleweed x86-64.
• I don't really expect side effects as autotools are mainly in maintenance mode picking up with recent compilers and more strict interpretation of C. They are emphasizing backward-compatibility and there was no major version change of any tool included.

[philburk]

I tested this on my new M4 Mac Mini.

git fetch origin pull/1020/head:auto_1020
git checkout auto_1020
make clean && ./configure && make

but got this error:

libtool: Version mismatch error.  This is libtool 2.4.7, but the
libtool: definition of this LT_INIT comes from libtool 2.4.2.
libtool: You should recreate aclocal.m4 with macros from libtool 2.4.7
libtool: and run autoconf again.
make: *** [clean] Error 63

So I changed the order and did the "make clean" AFTER the ./configure.

./configure && make clean && make

That worked fine. So the new configure seems GOOD on Mac OS.
Also the CI tests are passing.

[philburk]

I also tested it on my Raspberry Pi. It was GOOD.

[philburk]

I tested on Mac OS and Raspbian. It built fine.

[RossBencina]

Hi. I was testing this while working on some new CI scripts in draft PR #1020. The good news is that the updated files seemed to work fine on all tested CI platforms. However I did note a couple of strange warnings when running autoreconf against the files in this (#1020) PR:

autoreconf-2.72: running: /usr/bin/autoconf-2.72 --force
configure.ac:80: warning: back quotes and double quotes must not be escaped in: unknown Windows API \"$api\" (do you need --help?)
configure.ac:499: warning: AC_C_BIGENDIAN should be used with AC_CONFIG_HEADERS

See lines 106 and 107 of the "autoreconf" CI step here: https://github.com/PortAudio/portaudio/actions/runs/16820548423/job/47646396982?pr=1054

Note that the same warnings are not present when running autoreconf against master. See autoreconf step here:
https://github.com/PortAudio/portaudio/actions/runs/16821083986/job/47647942802?pr=1055

I'm not sure what this means yet. What do you think?

[RossBencina]

It would be nice to incorporate this patch: #1056 before the 19.8 release. But perhaps it can be done after this PR is merged, then we autoreconf again. Or you could bring the change into this PR.

[gruenich]

Fixed some more warnings, rebased, re-run with automake 1.18.1

[RossBencina]

@gruenich we have merged an edit to configure.in could you please update this PR then we will merge it.

[gruenich]

Rebased.

[RossBencina]

Thank you!