helpAutoconf - Support: sr #110375, AC_LANG_SAVE and AC_LANG_RESTORE...

 
 

sr #110375: AC_LANG_SAVE and AC_LANG_RESTORE should not be marked obsolete

Submitter:  Bruno Haible <haible>
Submitted:  Fri 13 Nov 2020 10:57:37 PM UTC
 
Category:  None Priority:  5 - Normal
Severity:  4 - Important Status:  Done
Privacy:  Public Assigned to:  None
Open/Closed:  Closed Operating System:  None
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Sun 15 Nov 2020 08:24:22 PM UTC, comment #2: 

Agreed.  Fixed in 15acc26a209accd353f5961487dfef3a03e12b4a.

Zack Weinberg <zackw>
Project Administrator
Fri 13 Nov 2020 11:05:49 PM UTC, comment #1: 

original submission:

> I think AC_LANG_SAVE and AC_LANG_RESTORE should not be marked obsolete, until a libtool.m4 release exists that does not use them any more.


It does sound reasonable to not warn about them for now, even if we document them as obsolete. Zack?

Paul Eggert <eggert>
Project Administrator
Fri 13 Nov 2020 10:57:37 PM UTC, original submission:  

In GNU gettext, autoconf 2.69d gave a number of "obsolete" warnings. I fixed those that I could fix. But some remain:

configure.ac:95: warning: The macro `AC_LANG_SAVE' is obsolete.
configure.ac:95: You should run autoupdate.
./lib/autoconf/lang.m4:126: AC_LANG_SAVE is expanded from...
../m4/libtool.m4:8072: _LT_LANG_RC_CONFIG is expanded from...
../m4/libtool.m4:841: _LT_LANG is expanded from...
../m4/libtool.m4:823: LT_LANG is expanded from...
configure.ac:95: the top level
configure.ac:95: warning: The macro `AC_LANG_RESTORE' is obsolete.
configure.ac:95: You should run autoupdate.
./lib/autoconf/lang.m4:135: AC_LANG_RESTORE is expanded from...
../m4/libtool.m4:8072: _LT_LANG_RC_CONFIG is expanded from...
../m4/libtool.m4:841: _LT_LANG is expanded from...
../m4/libtool.m4:823: LT_LANG is expanded from...
configure.ac:95: the top level

There are two problems here:
1) [Major] Libtool is not actively maintained (no release in 5 years, and no commit in 1.5 years). Therefore libtool.m4 is likely to produce the same warnings for the next 2 years or so. And there are MANY packages that use libtool.m4, and most of them don't really want to apply local modifications to libtool.m4.
2) [Normal] The Autoconf documentation describes what AC_LANG_SAVE and AC_LANG_RESTORE should be replaced with. I tried it, and got an error because Autoconf does not define a language named 'rc'.

Problem 2 may be surmountable with a couple of hours of effort, but problem 1 is not.

For this reason, I think AC_LANG_SAVE and AC_LANG_RESTORE should not be marked obsolete, until a libtool.m4 release exists that does not use them any more.

Bruno Haible <haible>

 

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    Date Changed by Updated Field Previous Value => Replaced by
    2020-11-15 zackw StatusNone Done
        Open/ClosedOpen Closed

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