Problem loading GCC 4.0 libraries into Java app

Subject: Problem loading GCC 4.0 libraries into Java app

From: Zoltan Foley-Fisher <email@hidden>

Date: Thu, 28 Jun 2007 13:45:12 -0700

Delivered-to: email@hidden

Hello there,

We are having an issue with compilation differences between GCC 3.3 and 4.0, OS 10.4.10, on PowerPC using 10.3.9 SDK, on Intel using 10.4u SDK.

We are working with the JRex library to embed Gecko framework in a Universal Java application. When we compile using GCC 3.3, the appropriate dynamic libraries are created without problem and packaged into a Java application bundle, which launches correctly.

But when we compile the same code with GCC 4.0, the dynamic libraries are created, but fail to load into our Java application correctly. We see some strange behaviours when using GDB, that occur every time the program is run, and only in very specific places in the large codebase:

On PPC, a C++ function is called

nsIXPConnect *xpc = nsContentUtils::XPConnect();

but returns null. nsContentUtils::XPConnect is defined as:

static nsIXPConnect *XPConnect()

{

return sXPConnect;

}

When we follow the call with GDB we notice that there are two sXPConnect symbols...

On Intel, another C++ function is called:

nsresult rv = CallGetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &sSecurityManager);

but the call results in sSecurityManager null. We follow the call with GDB and see correct values and code flow until this function return, where it mysteriously "drops" the value to be assigned to sSecurityManager.

Even more mysteriously, if we move the program counter back with GDB and repeat the function a second time, it returns the value for sSecurityManager correctly!

Have any of you guys encountered such behaviour before?

Thanks for any help,

Zoltan Foley-Fisher

Atimi Software Inc.

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