Hi David,
The motivation for adding --link-shared-lib was to satisfy a packaging requirement for the Debian squeak-vm package. The implementation is (or was meant to be) based on an earlier patch from the Debian package maintainers. Beyond that I have to confess that it is not well tested, and I don't know what issues may be lurking.
Traditionally (in the past) the interpreter VM was distributed as a compiled binary from squeakvm.org and was intended to be run as-is on various unix/linux platforms. This approach conflicts with Debian packaging requirements, hence the attempt to work around the issue with the --link-shared-lib configuration option.
CC to Phil B who has been working, with the excouragement and support of the Squeak Oversight Board, on updating the Debian package.
Dave
On Sun, Dec 19, 2021 at 04:49:39PM +0100, stes@PANDORA.BE wrote:
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Hi,
I have a question on the "classic VM" (from subversion) and the "JPEGReadWriter2" for the pluginJPEGReadWriter2Plugin
For Debian / Ubuntu Linux a configure option was added recently to squeak,
--link-shared-lib
The idea here is to compile the VM with the systems provided library.
By default the directory platforms/Cross/plugins/JPEGReaderWriter2 contains a copy of the files of the libjpeg(-turbo?) library.
As a test, I have tried to compile on OpenIndiana and Slackware Linux, with --link-shared-lib.
The compile works, the squeakvm links against -lpcre and -ljpeg.
BUT ... unfortunately on Slackware Linux 32bit it does not work :
The test from Example from http://wiki.squeak.org/squeak/4043
| jpgPicURL aStream | jpgPicURL := 'https://upload.wikimedia.org/wikipedia/commons/thumb/c/ce/Quartz_Br%C3%A9sil...'. aStream := HTTPSocket httpGet: jpgPicURL. (JPEGReadWriter2 formFromStream: aStream) asMorph openInHand
The above test works when building the VM without --link-shared-lib but fails with I configure with --link-shared-lib.
In the first case an image is displayed, in the second case the VM starts, the shared library libjpeg.so is loaded but nothing is displayed, when I run the test from http://wiki.squeak.org/squeak/4043
On Slackware Linux 14.2 /usr/lib/libjpeg.so points to libjpeg.so.62
I have many questions ... (1) why is the JPEG plugin delivered in two variants there is JPEG ReadWriter and a JPEG ReadWriter2.
Smalltalk listBuiltinModule:16. Smalltalk listBuiltinModule:17.
(2) why is this plugin not built as an external module instead of builtinModule
(3) why not removing all copied files from platforms/Cross/plugins/JPEG* and provide a cmake file there for the configuration of JPEG
I like the idea of using the systems provided library.
However I am not convinced the option OPT--link-shared-lib is the right way, to do that in Squeak VM classic.
The option --link-shared-lib seems not a good name to me.
It is "too general' for something specific like --enable-jpeg or --disable-jpeg
(4) Is the author of that plugin or those plugins still maintaining the plugin, using Squeak ?
(5) do Smalltalk systems like Cuis or Squeak really need a JPEG plugin , this seems something that could be optional instead of enabled by default
Regards, David Stes
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