Lots of fixes importing SDL source wholesale into a new iOS project

--HG--
rename : src/libm/math.h => src/libm/math_libm.h

src/libm/math_libm.h

@@ -0,0 +1,91 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_config.h"
+#include "SDL_stdinc.h"
+
+/* Math routines from uClibc: http://www.uclibc.org */
+
+#ifdef HAVE_ATAN
+#define atan            SDL_uclibc_atan
+#else
+#define atan            SDL_atan
+#endif
+double atan(double x);
+
+#ifndef HAVE_ATAN2
+#define __ieee754_atan2 SDL_atan2
+#endif
+
+#ifdef HAVE_COPYSIGN
+#define copysign        SDL_uclibc_copysign
+#else
+#define copysign        SDL_copysign
+#endif
+double copysign(double x, double y);
+
+#ifdef HAVE_COS
+#define cos             SDL_uclibc_cos
+#else
+#define cos             SDL_cos
+#endif
+double cos(double x);
+
+#ifdef HAVE_FABS
+#define fabs            SDL_uclibc_fabs
+#else
+#define fabs            SDL_fabs
+#endif
+double fabs(double x);
+
+#ifdef HAVE_FLOOR
+#define floor           SDL_uclibc_floor
+#else
+#define floor           SDL_floor
+#endif
+double floor(double x);
+
+#ifndef HAVE_LOG
+#define __ieee754_log   SDL_log
+#endif
+
+#ifndef HAVE_POW
+#define __ieee754_pow   SDL_pow
+#endif
+
+#ifdef HAVE_SCALBN
+#define scalbn          SDL_uclibc_scalbn
+#else
+#define scalbn          SDL_scalbn
+#endif
+double scalbn(double x, int n);
+
+#ifdef HAVE_SIN
+#define sin             SDL_uclibc_sin
+#else
+#define sin             SDL_sin
+#endif
+double sin(double x);
+
+#ifndef HAVE_SQRT
+#define __ieee754_sqrt  SDL_sqrt
+#endif
+
+/* vi: set ts=4 sw=4 expandtab: */