A prefix is used in preference to a namespace to facilitate exposing functions
to C code.
diff --git a/fdlibm.h b/fdlibm.h
--- a/fdlibm.h
+++ b/fdlibm.h
@@ -16,67 +16,67 @@
 
 #ifndef mozilla_imported_fdlibm_h
 #define	mozilla_imported_fdlibm_h
 
 #ifndef M_PI_2
 #define	M_PI_2		1.57079632679489661923	/* pi/2 */
 #endif
 
-double	acos(double);
-double	asin(double);
-double	atan(double);
-double	atan2(double, double);
-double	cos(double);
-double	sin(double);
-double	tan(double);
+double	fdlibm_acos(double);
+double	fdlibm_asin(double);
+double	fdlibm_atan(double);
+double	fdlibm_atan2(double, double);
+double	fdlibm_cos(double);
+double	fdlibm_sin(double);
+double	fdlibm_tan(double);
 
-double	cosh(double);
-double	sinh(double);
-double	tanh(double);
+double	fdlibm_cosh(double);
+double	fdlibm_sinh(double);
+double	fdlibm_tanh(double);
 
-double	exp(double);
-double	log(double);
-double	log10(double);
+double	fdlibm_exp(double);
+double	fdlibm_log(double);
+double	fdlibm_log10(double);
 
-double	pow(double, double);
+double	fdlibm_pow(double, double);
 
-double	ceil(double);
-double	fabs(double);
-double	floor(double);
+double	fdlibm_ceil(double);
+double	fdlibm_fabs(double);
+double	fdlibm_floor(double);
 
-double	acosh(double);
-double	asinh(double);
-double	atanh(double);
-double	cbrt(double);
-double	exp2(double);
-double	expm1(double);
-double	hypot(double, double);
-double	log1p(double);
-double	log2(double);
-double	rint(double);
-double	copysign(double, double);
-double	nearbyint(double);
-double	scalbn(double, int);
-double	trunc(double);
-float	acosf(float);
-float	asinf(float);
-float	atanf(float);
-float	cosf(float);
-float	sinf(float);
-float	tanf(float);
-float	exp2f(float);
-float	expf(float);
-float	log10f(float);
-float	logf(float);
-float	powf(float, float);
-float	sqrtf(float);
+double	fdlibm_acosh(double);
+double	fdlibm_asinh(double);
+double	fdlibm_atanh(double);
+double	fdlibm_cbrt(double);
+double	fdlibm_exp2(double);
+double	fdlibm_expm1(double);
+double	fdlibm_hypot(double, double);
+double	fdlibm_log1p(double);
+double	fdlibm_log2(double);
+double	fdlibm_rint(double);
+double	fdlibm_copysign(double, double);
+double	fdlibm_nearbyint(double);
+double	fdlibm_scalbn(double, int);
+double	fdlibm_trunc(double);
+float	fdlibm_acosf(float);
+float	fdlibm_asinf(float);
+float	fdlibm_atanf(float);
+float	fdlibm_cosf(float);
+float	fdlibm_sinf(float);
+float	fdlibm_tanf(float);
+float	fdlibm_exp2f(float);
+float	fdlibm_expf(float);
+float	fdlibm_log10f(float);
+float	fdlibm_logf(float);
+float	fdlibm_powf(float, float);
+float	fdlibm_sqrtf(float);
 
-float	ceilf(float);
-float	fabsf(float);
-float	floorf(float);
-float	hypotf(float, float);
-float	nearbyintf(float);
-float	rintf(float);
-float	scalbnf(float, int);
-float	truncf(float);
+float	fdlibm_ceilf(float);
+float	fdlibm_fabsf(float);
+float	fdlibm_floorf(float);
+float	fdlibm_hypotf(float, float);
+float	fdlibm_nearbyintf(float);
+float	fdlibm_rintf(float);
+float	fdlibm_scalbnf(float, int);
+float	fdlibm_truncf(float);
 
 #endif /* !mozilla_imported_fdlibm_h */
diff --git a/math_private.h b/math_private.h
--- a/math_private.h
+++ b/math_private.h
@@ -867,16 +867,69 @@ irintl(long double x)
 #define	__ieee754_j1f	j1f
 #define	__ieee754_y0f	y0f
 #define	__ieee754_y1f	y1f
 #define	__ieee754_jnf	jnf
 #define	__ieee754_ynf	ynf
 #define	__ieee754_remainderf remainderf
 #define	__ieee754_scalbf scalbf
 
+#define acos fdlibm_acos
+#define acosf fdlibm_acosf
+#define asin fdlibm_asin
+#define asinf fdlibm_asinf
+#define atan fdlibm_atan
+#define atanf fdlibm_atanf
+#define atan2 fdlibm_atan2
+#define cos fdlibm_cos
+#define cosf fdlibm_cosf
+#define sin fdlibm_sin
+#define sinf fdlibm_sinf
+#define tan fdlibm_tan
+#define tanf fdlibm_tanf
+#define cosh fdlibm_cosh
+#define sinh fdlibm_sinh
+#define tanh fdlibm_tanh
+#define exp fdlibm_exp
+#define expf fdlibm_expf
+#define exp2 fdlibm_exp2
+#define exp2f fdlibm_exp2f
+#define log fdlibm_log
+#define logf fdlibm_logf
+#define log10 fdlibm_log10
+#define log10f fdlibm_log10f
+#define pow fdlibm_pow
+#define powf fdlibm_powf
+#define ceil fdlibm_ceil
+#define ceilf fdlibm_ceilf
+#define fabs fdlibm_fabs
+#define fabsf fdlibm_fabsf
+#define floor fdlibm_floor
+#define acosh fdlibm_acosh
+#define asinh fdlibm_asinh
+#define atanh fdlibm_atanh
+#define cbrt fdlibm_cbrt
+#define expm1 fdlibm_expm1
+#define hypot fdlibm_hypot
+#define hypotf fdlibm_hypotf
+#define log1p fdlibm_log1p
+#define log2 fdlibm_log2
+#define scalb fdlibm_scalb
+#define copysign fdlibm_copysign
+#define scalbn fdlibm_scalbn
+#define scalbnf fdlibm_scalbnf
+#define trunc fdlibm_trunc
+#define truncf fdlibm_truncf
+#define floorf fdlibm_floorf
+#define nearbyint fdlibm_nearbyint
+#define nearbyintf fdlibm_nearbyintf
+#define rint fdlibm_rint
+#define rintf fdlibm_rintf
+#define sqrtf fdlibm_sqrtf
+
 /* fdlibm kernel function */
 int	__kernel_rem_pio2(double*,double*,int,int,int);
 
 /* double precision kernel functions */
 #ifndef INLINE_REM_PIO2
 int	__ieee754_rem_pio2(double,double*);
 #endif
 double	__kernel_sin(double,double,int);