Update to the 20200502 snapshot of GCC 10.0.1, which has branched for

the release of GCC 10.1 (and the GCC 10 release series) now.

Forward port r517843 | gerald | 2019-11-17 from lang/gcc9-devel since
this issue has not been addressed upstream or in our system compiler
yet. [1]

  clang on rs6000/powerpc* unfortunately poisons user namespace by default
  (without any special options or include files being required).

  Until that changes (or GCC changes) we need to avoid using vec_step as a
  variable name.

PR:		239266, 245483

lang/gcc10-devel/Makefile

@@ -2,7 +2,7 @@
 # $FreeBSD$
 
 PORTNAME=	gcc
-PORTVERSION=	10.0.1.s20200426
+PORTVERSION=	10.0.1.s20200502
 CATEGORIES=	lang
 MASTER_SITES=	GCC/snapshots/${DIST_VERSION}
 PKGNAMESUFFIX=	${SUFFIX}-devel

lang/gcc10-devel/distinfo

@@ -1,3 +1,3 @@
-TIMESTAMP = 1588276214
-SHA256 (gcc-10-20200426.tar.xz) = 30bc86cedeb3067397f6968b5e2f894690422d7eb225ada12423ef987b400864
-SIZE (gcc-10-20200426.tar.xz) = 71245664
+TIMESTAMP = 1588460385
+SHA256 (gcc-10-20200502.tar.xz) = a72ba391b8114837403a24b0776201411530093b85c70fe56ee2a932cc1d581e
+SIZE (gcc-10-20200502.tar.xz) = 71305288

lang/gcc10-devel/patch-clang-vec_step

@@ -0,0 +1,21 @@
+https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239266 reports how
+clang unfortunately poisons user namespace by default (without any
+special options).
+
+Until that changes (or GCC changes) we need to avoid using vec_step
+as a variable.
+
+--- UTC
+Index: gcc/tree-vect-loop.c
+===================================================================
+--- gcc/tree-vect-loop.c	(revision 273856)
++++ gcc/tree-vect-loop.c	(working copy)
+@@ -55,6 +55,8 @@ along with GCC; see the file COPYING3.  If not see
+ #include "vec-perm-indices.h"
+ #include "tree-eh.h"
+ 
++#define vec_step vec_step_
++
+ /* Loop Vectorization Pass.
+ 
+    This pass tries to vectorize loops.