# HG changeset patch
# User Chris Cannam
# Date 1571316175 -3600
# Node ID 871a2050236b3f1d61d14f3e307eaea95ef2131a
# Parent  710b4e44901b27c22e895b84a6370d2d8ca3c8dc
OK, so now this pragma provokes a warning in gcc! Guard it with a clang guard

diff -r 710b4e44901b -r 871a2050236b base/ById.cpp
--- a/base/ById.cpp	Wed Oct 16 16:29:46 2019 +0100
+++ b/base/ById.cpp	Thu Oct 17 13:42:55 2019 +0100
@@ -38,7 +38,9 @@
 
 // "warning: expression with side effects will be evaluated despite
 // being used as an operand to 'typeid'"
+#ifdef __clang__
 #pragma clang diagnostic ignored "-Wpotentially-evaluated-expression"
+#endif
 
 class AnyById::Impl
 {