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Guido van Rossum
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Misc/FAQ
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Misc/FAQ
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@ -6,8 +6,9 @@ Reply-to: guido@cwi.nl (Guido van Rossum)
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Approved: news-answers-request@MIT.Edu
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Archive-name: python-faq/part1
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Version: 1.19--
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Last-modified: 2 January 1995
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Submitted-by: Guido van Rossum <guido@cwi.nl>
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Version: 1.20
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Last-modified: 7 Februari 1995
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This article contains answers to Frequently Asked Questions about
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Python (an object-oriented interpreted programming language -- see
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@ -101,6 +102,7 @@ Here's an overview of the questions per chapter:
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3.12. Q. Trouble with prototypes on Ultrix.
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3.13. Q. Trouble with posix.listdir on NeXTSTEP 3.2.
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3.14. Q. Other trouble building Python on platform X.
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3.15. Q. How to configure dynamic loading on Lixux.
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4. Programming in Python
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4.1. Q. Is there a source code level debugger with breakpoints, step,
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@ -580,11 +582,14 @@ toplevel).
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3.8. Q. Python built with gcc for the DEC Alpha doesn't work.
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People have reported problems with both gcc 2.5.8 and 2.6.0. The DEC
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OSF/1 cc compiler does not have these problems so it's probably gcc's
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fault. One person reported that the problem went away when using -g
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instead of -O so this may be an option if you insist on using gcc. If
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someone tracks it down more completely I'd like to hear about it!
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People have reported problems with gcc 2.5.8 up to 2.6.2. The
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DEC OSF/1 cc compiler does not have these problems so it's probably
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gcc's fault. The latest news is that the problem still exists but
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only when you use -O and only in the Modules subdirectory. So one
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solution is to compile everything except Modules with gcc -O and then
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do the Modules directory with gcc without -O. If you find a version
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of gcc which doesn't have this bug or if you can reduce it further to
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a particular file, please let me know.
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3.9. Q. I use VPATH but some targets are built in the source directory.
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@ -662,10 +667,9 @@ HAVE_PROTOTYPES.
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3.13. Q. Trouble with posix.listdir on NeXTSTEP 3.2.
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A. If you built 1.2, you probably forgot to pass -posix as mentioned
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in the README file -- this links with the right version of the
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libraries. If you built an earlier version, that's also your problem
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(edit Makefile to add it to OPT), but you also need to remove this
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A. You need to pass "-posix" to the C compiler, especially in the link
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phase -- it uses the correct version of the C library. The easiest
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way is perhaps to do "make OPT=-posix". You also need to remove this
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NeXT-specific section from import.c:
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#if defined(NeXT) || defined(WITH_RLD)
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@ -682,6 +686,51 @@ version) you are using it will be difficult for me to figure out what
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is the matter. If you get a specific error message, please email it
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to me too.
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3.15. Q. How to configure dynamic loading on Lixux.
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A. (Thanks to Andrew Kuchling):
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Linux requires that you use the GNU DLD library. The stages of using
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dynamic libraries on Linux are:
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1) Get dld from [some -- see below] Linux site. I believe the version
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number is 3.2.4. Be careful here; the most recent GNU version is
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3.2.3, and doesn't support Linux; be sure to get it from a Linux
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mirror, not a GNU mirror. Compile it and install the library libdld.a
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somewhere; I used /usr/local/lib.
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2) Get Jack Jansen's DL library; its location is given in the
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_Extending Python_ manual as ftp://ftp.cwi.nl/pub/dynload/. Compile
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it and install libdl.a wherever you put libdld.a.
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3) Run Python's configure script, giving it the --with-dl-dld option,
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which requires a parameter giving the directory where you put the
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libraries.
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4) Recompile Python.
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If you run into trouble with this, send me some mail and we can work
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on the problem.
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I don't use ELF binaries, because I'd rather wait until everything is
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reliable; my current impression (and please correct me if I'm wrong)
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is that gcc-elf is still a bit wonky, and you have to compile the
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entire GNU library yourself. I'd much rather wait until ELF is a more
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standard part of Linux distributions. I suspect that once ELF is
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common, Python's configure script will pick up the dlfcn.h header file
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and dynamic linking will work automatically. Time will tell,
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however...
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It turns out that Linux DLD is not on sunsite.unc.edu; instead it's
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located at:
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<URL:ftp://tsx-11.mit.edu/pub/linux/sources/libs/dld-3.2.4.src.tar.gz>
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tsx-11 has mirrors; off the top of my head, one is ftp.uu.net, where
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the URL would be:
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<URL:ftp://ftp.uu.net/systems/unix/linux/sources/libs/dld-3.2.4.src.tar.gz>
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4. Programming in Python
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========================
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@ -977,7 +1026,7 @@ Anthony Baxter <anthony.baxter@aaii.oz.au> has written an interface to
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mSQL (mini-SQL). <URL:ftp://ftp.cwi.nl/pub/python/PymSQL.tar.gz>.
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Tom Culliton <culliton@clark.net> has written an Oracle module. Write
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him to get a copy of a late BETA version.
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him to get a copy of the latest version.
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4.15. Q. Is it possible to write obfuscated one-liners in Python?
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