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dpgeorgedpgeorge
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stmhal, math: Define _M_LN2 if not already defined.
Addresses issue adafruit#790.
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‎stmhal/math.c‎

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@@ -102,6 +102,10 @@ float copysignf(float x, float y) {
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#ifdef log2f
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#undef log2f
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#endif
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// some compilers have _M_LN2 defined in math.h, some don't
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#ifndef _M_LN2
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#define _M_LN2 (0.69314718055994530942)
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#endif
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float log2f(float x) { return logf(x) / (float)_M_LN2; }
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static const float _M_LN10 = 2.30258509299404; // 0x40135d8e

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