Fix up sincos, sincosf and sincosl to call to browser sin and cos fun…

…ctions to fix missing symbols in libc build, and to give better performance than the musl provided ones.

system/lib/libc/musl/src/math/sincos.c

@@ -13,6 +13,16 @@
 #define _GNU_SOURCE
 #include "libm.h"
 
+#ifdef __EMSCRIPTEN__
+#include <math.h>
+
+// XXX Emscripten: Use the browser-optimized versions of sin and cos, since they are faster.
+void sincos(double x, double *s, double *c)
+{
+	*s = sin(x);
+	*c = cos(x);
+}
+#else
 void sincos(double x, double *sin, double *cos)
 {
 	double y[2], s, c;
@@ -67,3 +77,4 @@ void sincos(double x, double *sin, double *cos)
 		break;
 	}
 }
+#endif

system/lib/libc/musl/src/math/sincosf.c

@@ -17,6 +17,10 @@
 #define _GNU_SOURCE
 #include "libm.h"
 
+#ifdef __EMSCRIPTEN__
+#include <math.h>
+#endif
+
 /* Small multiples of pi/2 rounded to double precision. */
 static const double
 s1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */
@@ -26,6 +30,11 @@ s4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */
 
 void sincosf(float x, float *sin, float *cos)
 {
+#ifdef __EMSCRIPTEN__
+// XXX Emscripten: Use the browser-optimized versions of sin and cos, since they are faster.
+	*sin = sinf(x);
+	*cos = cosf(x);
+#else
 	double y;
 	float_t s, c;
 	uint32_t ix;
@@ -114,4 +123,5 @@ void sincosf(float x, float *sin, float *cos)
 		*cos = s;
 		break;
 	}
+#endif
 }

system/lib/libc/musl/src/math/sincosl.c

@@ -1,6 +1,18 @@
 #define _GNU_SOURCE
 #include "libm.h"
 
+#ifdef __EMSCRIPTEN__
+#include <math.h>
+
+// XXX Emscripten: Use the browser-optimized versions of sin and cos, since they are faster.
+void sincosl(long double x, long double *sin, long double *cos)
+{
+	*sin = sinl(x);
+	*cos = cosl(x);
+}
+
+#else
+
 #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
 void sincosl(long double x, long double *sin, long double *cos)
 {
@@ -58,3 +70,5 @@ void sincosl(long double x, long double *sin, long double *cos)
 	}
 }
 #endif
+
+#endif