Do not redefine _USE_MATH_DEFINES in generated code (GH-4690)

Unconditionally adding `/D_USE_MATH_DEFINES` via cmdline triggers `-Wmacro-redefined` in cython-generated code.

Do not redefine _USE_MATH_DEFINES in generated code (GH-4690)
Unconditionally adding `/D_USE_MATH_DEFINES` via cmdline triggers `-Wmacro-redefined` in cython-generated code.
a1b6dae0 · Yuriy Chernyshov · GitHub · 518cbac8 · a1b6dae0
Commit a1b6dae0 authored Mar 22, 2022 by Yuriy Chernyshov Committed by GitHub Mar 21, 2022
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Cython/Utility/ModuleSetupCode.c Cython/Utility/ModuleSetupCode.c +3 -1

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--- a/Cython/Utility/ModuleSetupCode.c
+++ b/Cython/Utility/ModuleSetupCode.c
@@ -1285,7 +1285,9 @@ static CYTHON_INLINE int __Pyx_PyErr_GivenExceptionMatches2(PyObject *err, PyObj
 /////////////// MathInitCode ///////////////
 #if defined(_WIN32) || defined(WIN32) || defined(MS_WINDOWS)
+  #if !defined(_USE_MATH_DEFINES)
    #define _USE_MATH_DEFINES
+  #endif
 #endif
 #include <math.h>