libs: Add a few missing signatures for math.

libs/math.go

@@ -107,6 +107,9 @@ func init() {
 		buf.WriteString("float hypotf(float x, float y);\n")
 		buf.WriteString("double fmax(double x, double y);\n")
 		buf.WriteString("float fmaxf(float x, float y);\n")
+		buf.WriteString("double fmin(double x, double y);\n")
+		buf.WriteString("float fminf(float x, float y);\n")
+		buf.WriteString("int isfinite(double x);\n")
 		lib.Header = buf.String()
 		return lib
 	})

libs/math_test.go

@@ -0,0 +1,88 @@
+package libs
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/gotranspile/cxgo/types"
+)
+
+var expMathH = `#ifndef _cxgo_MATH_H
+#define _cxgo_MATH_H
+#include <cxgo_builtin.h>
+
+const double M_PI_val = 3.1415;
+#define M_PI M_PI_val
+double sin(double);
+float sinf(float);
+double asin(double);
+float asinf(float);
+double sinh(double);
+float sinhf(float);
+double asinh(double);
+float asinhf(float);
+double cos(double);
+float cosf(float);
+double acos(double);
+float acosf(float);
+double cosh(double);
+float coshf(float);
+double acosh(double);
+float acoshf(float);
+double tan(double);
+float tanf(float);
+double atan(double);
+float atanf(float);
+double tanh(double);
+float tanhf(float);
+double atanh(double);
+float atanhf(float);
+double round(double);
+#define roundf(x) round(x)
+double ceil(double);
+float ceilf(float);
+double floor(double);
+float floorf(float);
+double fabs(double);
+float fabsf(float);
+double pow(double, double);
+float powf(float, float);
+double sqrt(double);
+float sqrtf(float);
+double exp(double);
+float expf(float);
+double exp2(double);
+float exp2f(float);
+double log(double);
+float logf(float);
+double log10(double);
+float log10f(float);
+double log2(double);
+float log2f(float);
+double atan2(double y, double x);
+float atan2f(float y, float x);
+double modf(double x, double *iptr);
+float modff(float value, float *iptr);
+double ldexp(double x, _cxgo_go_int exp);
+double fmod(double x, double exp);
+int isnan(double x);
+double frexp(double x, int* exp);
+double hypot(double x, double y);
+float hypotf(float x, float y);
+double fmax(double x, double y);
+float fmaxf(float x, float y);
+double fmin(double x, double y);
+float fminf(float x, float y);
+int isfinite(double x);
+
+
+#endif // _cxgo_MATH_H
+`
+
+func TestMathH(t *testing.T) {
+	c := NewEnv(types.Config32())
+	l, ok := c.GetLibrary(mathH)
+	require.True(t, ok)
+	require.Equal(t, expMathH, l.Header, "\n%s", l.Header)
+}