From b42e2b36ee66afe38298a51a18a2aba0936708db Mon Sep 17 00:00:00 2001
From: Hugues Delorme <delorme.hugues@fougue.pro>
Date: Fri, 12 Feb 2016 11:45:46 +0100
Subject: [PATCH] Fix Clang compiler error and warnings

---
 CMakeLists.txt                         | 6 ++++++
 src/gmio_core/internal/vecgeom_utils.h | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 42ac85b..4424466 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -240,6 +240,12 @@ if(CMAKE_C_COMPILER_IS_GCC_COMPATIBLE)
     set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 endif()
 
+# Specific flags for Clang
+if(CMAKE_COMPILER_IS_CLANG)
+    # Clang on apple-darwin13.4.0 wrongly reports many unused functions
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-unused-function")
+endif()
+
 # Specific flags for Visual C++
 if(MSVC)
     # Treat all files a C source files
diff --git a/src/gmio_core/internal/vecgeom_utils.h b/src/gmio_core/internal/vecgeom_utils.h
index e21a1e2..99f59e0 100644
--- a/src/gmio_core/internal/vecgeom_utils.h
+++ b/src/gmio_core/internal/vecgeom_utils.h
@@ -35,6 +35,8 @@ GMIO_INLINE void gmio_cross_product_f64(
  *  Implementation
  */
 
+#include <math.h>
+
 void gmio_cross_product_f32(
         float ux, float uy, float uz,
         float vx, float vy, float vz,