diff options
Diffstat (limited to 'Misc/README.AIX')
| -rw-r--r-- | Misc/README.AIX | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/Misc/README.AIX b/Misc/README.AIX deleted file mode 100644 index d928f53..0000000 --- a/Misc/README.AIX +++ /dev/null @@ -1,155 +0,0 @@ -Subject: AIX - Misc/AIX-NOTES -From: Vladimir Marangozov <Vladimir.Marangozov@imag.fr> -To: guido@CNRI.Reston.Va.US (Guido van Rossum) -Date: Wed, 6 Aug 1997 11:41:00 +0200 (EET) - -============================================================================== - COMPILER INFORMATION ------------------------------------------------------------------------------- - -(1) A problem has been reported with "make test" failing because of "weird - indentation." Searching the comp.lang.python newsgroup reveals several - threads on this subject, and it seems to be a compiler bug in an old - version of the AIX CC compiler. However, the compiler/OS combination - which has this problem is not identified. In preparation for the 1.4 - release, Vladimir Marangozov (Vladimir.Marangozov@imag.fr) and Manus Hand - (mhand@csn.net) reported no such troubles for the following compilers and - operating system versions: - AIX C compiler version 3.1.2 on AIX 4.1.3 and AIX 4.1.4 - AIX C compiler version 1.3.0 on AIX 3.2.5 - If you have this problem, please report the compiler/OS version. - -(2) Stefan Esser (se@MI.Uni-Koeln.DE), in work done to compile Python - 1.0.0 on AIX 3.2.4, reports that AIX compilers don't like the LANG - environment varaiable set to European locales. This makes the compiler - generate floating point constants using "," as the decimal separator, - which the assembler doesn't understand (or perhaps it is the other way - around, with the assembler expecting, but not getting "," in float - numbers). "LANG=C; export LANG" solves the problem, as does - "LANG=C $(MAKE) ..." in the master Makefile. - -(3) The cc (or xlc) compiler considers "Python/ceval.c" too complex to - optimize, except when invoked with "-qmaxmem=4000" - -(4) Some problems (due to _AIX not being #defined) when python 1.0.0 was - compiled using 'gcc -ansi' were reported by Stefan Esser, but were not - investigated. - -(5) The cc compiler has internal variables named "__abs" and "__div". These - names are reserved and may not be used as program variables in compiled - source. (As an anecdote in support of this, the implementation of - Python/operator.c had this problem in the 1.4 beta releases, and the - solution was to re#define some core-source variables having these names, - to give these python variables different names if the build is being done - on AIX.) - -(6) As mentioned in the README, builds done immediately after previous builds - (without "make clean" or "make clobber") sometimes fail for mysterious - reasons. There are some unpredictable results when the configuration - is changed (that is, if you "configure" with different parameters) or if - intermediate changes are made to some files. Performing "make clean" or - "make clobber" resolves the problems. - -============================================================================== - THREAD SUPPORT ------------------------------------------------------------------------------- - -As of AIX version 4, there are two (incompatible) types of pthreads on AIX: - a) AIX DCE pthreads (on AIX 3.2.5) - b) AIX 4 pthreads (on AIX 4.1 and up) -Support has been added to Python to handle the distinction. - -The cc and gcc compilers do not initialize pthreads properly. The only -compilers that can initialize pthreads properly are IBM *_r* compilers, -which use the crt0_r.o module, and which invoke ld with the reentrant -version of libc (libc_r). - -In order to enable thread support, follow these steps: - 1. Uncomment the thread module in Modules/Setup - 2. configure --without-gcc --with-thread ... - 3. make CC="cc_r" OPT="-O -qmaxmem=4000" - -For example, to make with both threads and readline, use: - ./configure --without-gcc --with-thread --with-readline=/usr/local/lib - make CC=cc_r OPT="-O2 -qmaxmem=4000" - -If the "make" which is used ignores the "CC=cc_r" directive, one could alias -the cc command to cc_r (for example, in C-shell, perform an "alias cc cc_r"). - -Vladimir Marangozov (Vladimir.Marangozov@imag.fr) provided this information, -and he reports that a cc_r build initializes threads properly and that all -demos on threads run okay with cc_r. - -============================================================================== - SHARED LIBRARY SUPPORT ------------------------------------------------------------------------------- - -AIX shared library support was added to Python in the 1.4 release by Manus -Hand (mhand@csn.net) and Vladimir Marangozov (Vladimir.Marangozov@imag.fr). - -Python modules may now be built as shared libraries on AIX using the normal -process of uncommenting the "*shared*" line in Modules/Setup before the -build. - -AIX shared libraries require that an "export" and "import" file be provided -at compile time to list all extern symbols which may be shared between -modules. The "export" file (named python.exp) for the modules and the -libraries that belong to the Python core is created by the "makexp_aix" -script before performing the link of the python binary. It lists all global -symbols (exported during the link) of the modules and the libraries that -make up the python executable. - -When shared library modules (.so files) are made, a second shell script -is invoked. This script is named "ld_so_aix" and is also provided with -the distribution in the Modules subdirectory. This script acts as an "ld" -wrapper which hides the explicit management of "export" and "import" files; -it adds the appropriate arguments (in the appropriate order) to the link -command that creates the shared module. Among other things, it specifies -that the "python.exp" file is an "import" file for the shared module. - -At the time of this writing, neither the python.exp file nor the makexp_aix -or ld_so_aix scripts are installed by the make procedure, so you should -remember to keep these and/or copy them to a different location for -safekeeping if you wish to use them to add shared extension modules to -python. However, if the make process has been updated since this writing, -these files MAY have been installed for you during the make by the -LIBAINSTALL rule, in which case the need to make safe copies is obviated. - -If you wish to add a shared extension module to the language, you would follow -the steps given in the example below (the example adds the shared extension -module "spam" to python): - 1. Make sure that "ld_so_aix" and "makexp_aix" are in your path. - 2. The "python.exp" file should be in the current directory. - 3. Issue the following commands or include them in your Makefile: - cc -c spammodule.c - ld_so_aix cc spammodule.o -o spammodule.so - -For more detailed information on the shared library support, examine the -contents of the "ld_so_aix" and "makexp_aix" scripts or refer to the AIX -documentation. - -NOTE: If the extension module is written in C++ and contains templates, - an alternative to "ld_so_aix" is the /usr/lpp/xlC/bin/makeC++SharedLib - script. Chris Myers (myers@TC.Cornell.EDU) reports that ld_so_aix - works well for some C++ (including the C++ that is generated - automatically by the Python SWIG package [SWIG can be found at - http://www.cs.utah.edu/~beazley/SWIG/swig.html]). However, it is not - known whether makeC++SharedLib can be used as a complete substitute - for ld_so_aix. - -According to Gary Hook from IBM, the format of the export file changed -in AIX 4.2. For AIX 4.2 and later, a period "." is required on the -first line after "#!". If python crashes while importing a shared -library, you can try modifying the LINKCC variable in the Makefile. -It probably looks like this: - - LINKCC= $(srcdir)/Modules/makexp_aix Modules/python.exp \"\" $(LIBRARY); $(PURIFY) $(CXX) - -You should modify the \"\" to be a period: - - LINKCC= $(srcdir)/Modules/makexp_aix Modules/python.exp . $(LIBRARY); $(PURIFY) $(CXX) - -Using a period fixed the problem in the snake farm. YMMV. -This fix has been incorporated into Python 2.3. - -============================================================================== |