[PATCH] lang/python27 -- Fix namespace collision

[Steve Kargl]

On Sun, Jun 18, 2017 at 11:29:05AM -0700, Steve Kargl wrote:
> Both IEEE-754 2008 and ISO/IEC TS 18661-4 define the half-cycle
> trignometric functions cospi, sinpi, and tanpi.  When libm (aka
> math.h) grows support for sinpi(x), lang/python27 has a namespace
> collision.  The attached patch fixes the problem.
> 

Well, that's inconvenient.  Seems attachments are stripped.

--- Modules/mathmodule.c.orig	2017-06-18 11:09:05.938222000 -0700
+++ Modules/mathmodule.c	2017-06-18 11:09:56.248307000 -0700
@@ -71,7 +71,7 @@
 static const double sqrtpi = 1.772453850905516027298167483341145182798;
 
 static double
-sinpi(double x)
+my_sinpi(double x)
 {
     double y, r;
     int n;
@@ -270,7 +270,7 @@
        integer. */
     if (absx > 200.0) {
         if (x < 0.0) {
-            return 0.0/sinpi(x);
+            return 0.0/my_sinpi(x);
         }
         else {
             errno = ERANGE;
@@ -294,7 +294,7 @@
     }
     z = z * lanczos_g / y;
     if (x < 0.0) {
-        r = -pi / sinpi(absx) / absx * exp(y) / lanczos_sum(absx);
+        r = -pi / my_sinpi(absx) / absx * exp(y) / lanczos_sum(absx);
         r -= z * r;
         if (absx < 140.0) {
             r /= pow(y, absx - 0.5);
@@ -366,7 +366,7 @@
             (x-0.5)*(log(x+lanczos_g-0.5)-1);
     }
     else {
-        r = log(pi) - log(fabs(sinpi(absx))) - log(absx) -
+        r = log(pi) - log(fabs(my_sinpi(absx))) - log(absx) -
             (log(lanczos_sum(absx)) - lanczos_g +
              (absx-0.5)*(log(absx+lanczos_g-0.5)-1));
     }

-- 
Steve
20170425 https://www.youtube.com/watch?v=VWUpyCsUKR4
20161221 https://www.youtube.com/watch?v=IbCHE-hONow