or interactively at the appropriate Configure prompt.
-With the PerlIO abstraction layer, there is another possibility for
-the underlying IO calls, AT&T's "sfio". This has superior performance
-to stdio.h in many cases, and is extensible by the use of "discipline"
-modules ("Native" PerlIO has them too). Sfio currently only builds on
-a subset of the UNIX platforms perl supports. Because the data
-structures are completely different from stdio, perl extension modules
-or external libraries may not work. This configuration exists to
-allow these issues to be worked on.
-
-This option requires the 'sfio' package to have been built and installed.
-The latest sfio is available from http://www.research.att.com/sw/tools/sfio/
-
-You select this option by
-
- sh Configure -Duseperlio -Dusesfio
-
-If you have already selected -Duseperlio, and if Configure detects
-that you have sfio, then sfio will be the default suggested by
-Configure.
-
-Note: On some systems, sfio's iffe configuration script fails to
-detect that you have an atexit function (or equivalent). Apparently,
-this is a problem at least for some versions of Linux and SunOS 4.
-Configure should detect this problem and warn you about problems with
-_exit vs. exit. If you have this problem, the fix is to go back to
-your sfio sources and correct iffe's guess about atexit.
-
=head3 Algorithmic Complexity Attacks on Hashes
In Perls 5.8.0 and earlier it was easy to create degenerate hashes.
=item *** WHOA THERE!!! ***
-Occasionally, Configure makes a wrong guess. For example, on SunOS
-4.1.3, Configure incorrectly concludes that tzname[] is in the
-standard C library. The hint file is set up to correct for this. You
-will see a message:
-
- *** WHOA THERE!!! ***
- The recommended value for $d_tzname on this machine was "undef"!
- Keep the recommended value? [y]
-
-You should always keep the recommended value unless, after reading the
-relevant section of the hint file, you are sure you want to try
-overriding it.
-
-If you are re-using an old config.sh, the word "previous" will be
-used instead of "recommended". Again, you will almost always want
-to keep the previous value, unless you have changed something on your
-system.
+If you are re-using an old config.sh, it's possible that Configure detects
+different values from the ones specified in this file. You will almost
+always want to keep the previous value, unless you have changed something
+on your system.
For example, suppose you have added libgdbm.a to your system
and you decide to reconfigure perl to use GDBM_File. When you run
projects / p5sagit/p5-mst-13.2.git / blobdiff