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3f59c40b5e
* The autoconf-archive package contains macros useful for detecting C++
standard and testing other C++ capabilities but that package was never
included in the install_prereq script so many existing build environments
won't have it. Even if it is installed, older versions won't newer C++
standards and will actually cause an error if you try to test for that
version. To make it available for those environments, the
ax_cxx_compile_stdcxx.m4 macro has copied from the latest release of
autoconf-archive into the autoconf directory.
* A convenience wrapper(ast_cxx_check_std) around ax_cxx_compile_stdcxx was
also added so checking the standard version and setting the
asterisk-specific PBX_ variables becomes a one-liner:
`AST_CXX_CHECK_STD([std], [force_latest_std])`.
Calling that with a version of `17` for instance, will set PBX_CXX17
to 0 or 1 depending on whether the current c++ compiler supports stdc++17.
HAVE_CXX17 will also be 'defined" or not depending on the result.
* C++ compilers hardly ever default to the latest standard they support. g++
version 14 for instance supports up to C++23 but only uses C++17 by default.
If you want to use C++23, you have to add `-std=gnu++=23` to the g++
command line. If you set the second argument of AST_CXX_CHECK_STD to "yes",
the macro will automatically keep the highest `-std=gnu++` value that
worked and pass that to the Makefiles.
* The autoconf-archive package was added to install_prereq for future use.
* Updated configure.ac to use AST_CXX_CHECK_STD() to check for C++
versions 11, 14, 17, 20 and 23.
* Updated configure.ac to accept the `--enable-latest-cxx-std` option which
will set the second option to AST_CXX_CHECK_STD() to "yes". The default
is "no".
* ast_copy_string() in strings.h declares the 'sz' variable as volatile and
does an `sz--` on it later. C++20 no longer allows the `++` and `--`
increment and decrement operators to be used on variables declared as
volatile however so that was changed to `sz -= 1`.
(cherry picked from commit fb45a473cf)
messages-expire.pl messages-expire finds messages more than X days old and deletes them. Because the older messages will be the lower numbers in the folder (msg0000 will be older than msg0005), just deleting msg0000 will not work. expire-messages then runs a routine that goes into every folder in every mailbox to reorganize. If the folder contains msg0000, no action is taken. If the folder does not, the rename routine takes the oldest message and names it msg0000, the next oldest message and names it msg0001 and so on. The file deletion is done by the -exec parameter to 'find'. It would be far more efficient to take the output from 'find' and just reorganize the directories from which we deleted a file. Something for the future... Keep in mind that messages are deleted at the beginning of the script you will have mailbox trouble if you check messages before the script reorganizes your mailbox. To use it, make sure the paths are right. Adjust $age (originally set to 31) if necessary.