Fix redefine of `WIN32_LEAN_AND_MEAN` within `_machine.h`

[tcormackMW]

Summary

Issue with redefinition of WIN32_LEAN_AND_MEAN within include/oneapi/tbb/detail/_machine.h

Environment

Occurs on Windows

Observed Behavior

Compilation failure on windows of a redefinition of the WIN32_LEAN_AND_MEAN macro

Expected Behavior

I expect this not to occur if I have defined the macro elsewhere in my source code.

I have verified that changing:

oneTBB/include/oneapi/tbb/detail/_machine.h

Line 31 in de0daa2

#define WIN32_LEAN_AND_MEAN

to

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif

solves the problem

[dnmokhov]

Hi @tcormackMW,

The macro redefinition warning should normally not occur when you have defined the macro elsewhere in your source code, because the define in _machine.h is only for builds of the TBBMalloc library itself.

Would you be able to share a compilation command that results in the macro redefinition warning?

Thank you!