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65 lines
2.8 KiB
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65 lines
2.8 KiB
Plaintext
Python and MPW
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==============
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There is conditional code in Python for MPW. This has been used with
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different compilers at various points in time. Right now it is being
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used to turn the entire interpreter into a shared library on 68K Macs,
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so we can build "applets". I have used MPW 3.2 and the OpenDoc
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development environment from an OpenDoc CD released in 1984. This
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contains the Symantec C compiler for MPW, version 7.XXX, the
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Universal Headers version 2.0a1 (XXX), and early versions of CFM-68K
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(the Code Fragment Manager ported back to the 68K Mac) and
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MixedModeInit, which are required to use shared libraries.
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I've created a Makefile that does everything, plus a three-line Build
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script that calls Make and runs its output. The Makefile assumes that
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it lives in a 1-deep subdirectory of the root, so e.g. the Python
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Include directory can be referenced through "::Include". All object
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files are collected in the subsubdirectory Objcode.
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I use these feature test macros:
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MPW for all MPW compilers (e.g. long double in <math.h>)
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__SC__ for things specific to the Symantec C compiler
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(e.g. doesn't like static forward)
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__CFM68K__ for things specific to CFM-68K
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(e.g. it requires the use of #pragma lib_export on|off)
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HAVE_UNIVERSAL_HEADERS for things not yet in Think's headers (e.g. UPPs)
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GENERATINGCFM for both PPC and 68K Code Fragment Manager
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MPW is defined in config.h (if it finds that applec is defined);
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HAVE_UNIVERSAL_HEADERS is defined in macglue.h depending on whether it
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thinks we are using Universal Headers. The others are defined by the
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compiler or by the system headers.
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Compiler switches were a nightmare until I found I had to use -b.
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This wasn't mentioned in the CFM-68K docs that came on the OpenDoc
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CD-ROM.
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Applets
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=======
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(XXX This text file is on my Mac)
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Warning: Mixing Think C and MPW
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===============================
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(XXX Need to check what convention SC uses -- I hope it uses Think's.)
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If you are mixing Think C and MPW, you may experience weird errors in
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previously correct modules. These disappear when you throw away the
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module's .pyc file. The errors usually have to do with string
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literals containing '\n' or '\r'. The reason is an incompatibility
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between their handling of '\n' and '\r' -- in MPW C, '\n' actually is
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ASCII CR while '\r' is ASCII LF, which is the reverse situation from
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any other ASCII based C implementation. This behaviour is inherited
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by Python compiled with MPW C. This is normally not a problem, but
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*binary* files written by one system will be mis-interpreted by the
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other, and this is what happens to the .pyc files. There is no easy
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way to fix this in the source. (This is a real shame, since the
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format of .pyc files was carefully designed to be independent of byte
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order and integer size -- deviations in the ASCII character codes were
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never anticipated.)
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