Allow building with MSVC and Strawberry perl

Strawberry uses __builtin_expect which Visual C doesn't have. For this
case define it as a noop. Solution taken from vim sources.

Backpatch to all live branches

diff --git a/src/pl/plperl/plperl.h b/src/pl/plperl/plperl.h
index 0c196ea0469ec8b2d6dcaa67e2b0a5b1ccb5d443..5243f308bd5c909cf1387886dc4a908ce8c7b16c 100644 (file)
--- a/src/pl/plperl/plperl.h
+++ b/src/pl/plperl/plperl.h
@@ -58,6 +58,8 @@
 #ifdef isnan
 #undef isnan
 #endif
+/* Work around for using MSVC and Strawberry Perl >= 5.30. */
+#define __builtin_expect(expr, val) (expr)
 #endif
 
 /*