[polyml] _environ not found in polyml applications on Mac

Hi Bernard, I couldn't reproduce the problem with Mac OS X 10.8.0. I managed to build a standalone application fine but I've committed the patch as you suggested.

Best regards, David

On 02/10/2012 11:13, Bernard Berthomieu wrote:

Hello,

poly builds and runs fine on mac, but standalone applications do not work (on OSX 10.6.8, at least). When running aplications, one gets:

dyld: Symbol not found: _environ Referenced from: / ... /lib/libpolyml.4.dylib Expected in: flat namespace in / ... /lib/libpolyml.4.dylib Trace/BPT trap

It happens that variable environ cannot be accessed directly from shared libraries; there is a paragraph about that in the environ(7) man page (last paragraph).

The fix is to replace in file libpolyml/process_env.cpp

the line:

 extern char **environ;

by:

 #if __APPLE__
 #include <crt_externs.h>
 #define environ (*_NSGetEnviron())
 #else
 extern char **environ;
 #endif

Best, Bernard.

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