From aba9f51fef647046c7da46309b19e2315fb5b8d4 Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Thu, 3 Apr 2014 21:16:37 +0100
Subject: [PATCH] stmhal: #undef log2f if it's defined.

---
 stmhal/math.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/stmhal/math.c b/stmhal/math.c
index 534389df51..61ba7280ea 100644
--- a/stmhal/math.c
+++ b/stmhal/math.c
@@ -64,6 +64,10 @@ float sqrtf(float x) {
 // TODO we need import these functions from some library (eg musl or newlib)
 float powf(float x, float y) { return 0.0; }
 float logf(float x) { return 0.0; }
+// some compilers define log2f in terms of logf
+#ifdef log2f
+#undef log2f
+#endif
 float log2f(float x) { return 0.0; }
 float log10f(float x) { return 0.0; }
 float tanhf(float x) { return 0.0; }