From a92a71476f92c4499929c4235befc4156721cee3 Mon Sep 17 00:00:00 2001
From: Michał Janiszewski <janisozaur@gmail.com>
Date: Jun 24 2016 08:35:50 +0000
Subject: isnan fix


isnan is already defined on Linux in math.h, as included in:

    toonz/sources/include/tutil.h:7,
    toonz/sources/include/traster.h:6,
    toonz/sources/include/tcolorutils.h:9,
    toonz/sources/common/tapptools/tcolorutils.cpp:4:

with type:

    constexpr bool std::isnan(double)

---

diff --git a/toonz/sources/common/tapptools/tcolorutils.cpp b/toonz/sources/common/tapptools/tcolorutils.cpp
index d05d375..95f375d 100644
--- a/toonz/sources/common/tapptools/tcolorutils.cpp
+++ b/toonz/sources/common/tapptools/tcolorutils.cpp
@@ -13,7 +13,6 @@ typedef float KEYER_FLOAT;
 #ifdef _WIN32
 #define ISNAN _isnan
 #else
-extern "C" int isnan(double);
 #define ISNAN isnan
 #endif
 
diff --git a/toonz/sources/stdfx/pins.cpp b/toonz/sources/stdfx/pins.cpp
index b4ddf97..3c17f21 100644
--- a/toonz/sources/stdfx/pins.cpp
+++ b/toonz/sources/stdfx/pins.cpp
@@ -10,7 +10,6 @@
 #ifdef _WIN32
 #define ISNAN _isnan
 #else
-extern "C" int isnan(double);
 #define ISNAN isnan
 #endif