VRClientCoreFactory (and presumably HmdSystemFactory) need to be cdecl to match OpenVR SDK (Closes 8749) #8771
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…ll." This reverts commit 454533f. This had no effect on x64 as stdcall and cdecl are both ignored by the compiler. On x86 it was caused a crash due to the OpenVR SDK implicitly declaring the factory function as cdecl (the default). Closes issue ValveSoftware#8749.
Resolves the following linker warnings ld: warning: resolving _HmdSystemFactory@8 by linking to _HmdSystemFactory ld: warning: resolving _VRClientCoreFactory@8 by linking to _VRClientCoreFactory
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The
VRClientCoreFactoryfunction is declared in the OpenVR SDK without a calling convention. According to Microsoft cdecl is the default calling convention for C and C++ functions, so this means that the user side needs VRClientCoreFactory to be cdecl and not stdcall. This only affects x86 as the compiler ignoresstdcallandcdeclwhen compiling for x64 mode. Without this the callingVR_Initfrom x86 code crashes.Also switched the spec file to be
cdeclto get rid of some longstanding linker warnings. Presumably it didn't matter that these were wrong asVRClientCoreFactoryis only called by the OpenVR SDKVR_Init, which manually loads the library, performing an explicit symbol lookup, and calls through acdeclfunction pointer.