Loading libSystem.dylib on Mac OS X?

I am currently testing a new version of JNIPort on Mac OS X 10.6, and there
is a problem in VisualWorks 7.5. JNIPort needs some functions from the
standard C library, and there is an ExternalInterface for that which uses
libSystem.dylib. In VW 7.7 and 7.7.1, everything works as intended. In VW
7.5 however, I can't load the library. #primLoadLibrary results in a
primitive failure for the ExternalLibrary with name #'libSystem.dylib':

a SystemError(#'generic error','NSObjectFileImageInappropriateFile')

This does not happen in VW 7.7. Does anybody know what could be wrong?

Thanks in advance for any help!
Joachim Geidel

-------

The class is defined as follows (you'll have to remove the Namespace JNIPort
if you want to try the code):

Smalltalk.JNIPort defineClass: #StandardLibInterface
    superclass: #{External.ExternalInterface}
    indexedType: #none
    private: false
    instanceVariableNames: ''
    classInstanceVariableNames: ''
    imports: '
            private JNIPort.StandardLibInterfaceDictionary.*
            '
    category: 'JNIPort StandardLibInterface'
    attributes: #(
            #(#includeFiles #('stdio.h' 'stdarg.h'))
            #(#includeDirectories #('include'))
            #(#libraryFiles #('msvcrt.dll' 'libc.so.6' 'libc.sl'
'libSystem.dylib'))
            #(#libraryDirectories #())
            #(#beVirtual false)
            #(#optimizationLevel #full))

To reproduce, you'll need the following methods:

StandardLibInterface class>>libraryFilesSearchSignals

    ^LibraryNotFoundError, LibraryNotLoadedError,
ExternalObjectNotFoundError

StandardLibInterface>>primGetenv: string
    "Answer the value of the environment variable aString."

    <C: char * getenv( const char *string )>
    ^self externalAccessFailedWith: _errorCode

Code to reproduce the error:

StandardLibInterface new primGetenv: 'HOME'


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On Jan 18, 2011, at 11:23 PM, Joachim Geidel wrote:

It's possible the 7.5 VM was compiled with OSX 10.4 and cannot load the dylib you've specified. Try using a newer vm with the older image?

Michael
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Am 19.01.11 09:23 schrieb Michael Lucas-Smith:
That seems to be it. When I use the VW 7.5 or 7.6 VMs, the library can't be
loaded, with the 7.7 VM everything works.

Thanks!
Joachim


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