Fixed Visual C++ build

configure.in

@@ -152,7 +152,7 @@ if test x$enable_libc = xyes; then
     AC_CHECK_FUNCS(malloc calloc realloc free getenv putenv unsetenv qsort abs bcopy memset memcpy memmove strlen strlcpy strlcat strdup _strrev _strupr _strlwr strchr strrchr strstr itoa _ltoa _uitoa _ultoa strtol strtoul _i64toa _ui64toa strtoll strtoull atoi atof strcmp strncmp _stricmp strcasecmp _strnicmp strncasecmp sscanf snprintf vsnprintf sigaction setjmp nanosleep)
 
     AC_CHECK_LIB(m, pow, [LIBS="$LIBS -lm"; EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lm"])
-    AC_CHECK_FUNCS(copysign cos cosf fabs floor log pow scalbn sin sinf sqrt)
+    AC_CHECK_FUNCS(ceil copysign cos cosf fabs floor log pow scalbn sin sinf sqrt)
 
     AC_CHECK_LIB(iconv, libiconv_open, [LIBS="$LIBS -liconv"; EXTRA_LDFLAGS="$EXTRA_LDFLAGS -liconv"])
     AC_CHECK_FUNCS(iconv)

include/SDL_config.h.in

@@ -130,6 +130,7 @@
 #undef HAVE_SNPRINTF
 #undef HAVE_VSNPRINTF
 #undef HAVE_M_PI
+#undef HAVE_CEIL
 #undef HAVE_COPYSIGN
 #undef HAVE_COS
 #undef HAVE_COSF

include/SDL_config_win32.h

@@ -117,6 +117,7 @@ typedef unsigned int uintptr_t;
 #define HAVE__STRNICMP 1
 #define HAVE_SSCANF 1
 #define HAVE_M_PI 1
+#define HAVE_CEIL 1
 #define HAVE_COPYSIGN 1
 #define HAVE_COS 1
 #define HAVE_COSF 1

include/SDL_stdinc.h

@@ -646,6 +646,12 @@ extern DECLSPEC int SDLCALL SDL_vsnprintf(char *text, size_t maxlen,
 #define M_PI    3.14159265358979323846264338327950288   /* pi */
 #endif
 
+#ifdef HAVE_CEIL
+#define SDL_ceil        ceil
+#else
+#define SDL_ceil(x)     ((double)(int)((x)+0.5))
+#endif
+
 #ifdef HAVE_COPYSIGN
 #define SDL_copysign    copysign
 #else

src/SDL_compat.c

@@ -478,7 +478,6 @@ SDL_SetVideoMode(int width, int height, int bpp, Uint32 flags)
 {
     SDL_DisplayMode desktop_mode;
     SDL_DisplayMode mode;
-    const char *env;
     int window_x = SDL_WINDOWPOS_UNDEFINED;
     int window_y = SDL_WINDOWPOS_UNDEFINED;
     Uint32 window_flags;

src/audio/SDL_audio.c

@@ -347,7 +347,6 @@ SDL_RunAudio(void *devicep)
     void *udata;
     void (SDLCALL * fill) (void *userdata, Uint8 * stream, int len);
     int silence;
-    int stream_max_len;
 
     /* For streaming when the buffer sizes don't match up */
     Uint8 *istream;

src/audio/SDL_audiocvt.c

@@ -937,7 +937,7 @@ SDL_BuildAudioResampleCVT(SDL_AudioCVT * cvt, int dst_channels,
         cvt->filters[cvt->filter_index++] = filter;
         if (src_rate < dst_rate) {
             const double mult = ((double) dst_rate) / ((double) src_rate);
-            cvt->len_mult *= (int) ceil(mult);  /* !!! FIXME: C runtime dependency. */
+            cvt->len_mult *= (int) SDL_ceil(mult);
             cvt->len_ratio *= mult;
         } else {
             cvt->len_ratio /= ((double) src_rate) / ((double) dst_rate);