[libcxx] r331910 - Allow copy elision in path concatenation

[David Bolvansky via cfe-commits]

Author: xbolva00
Date: Wed May  9 11:57:17 2018
New Revision: 331910

URL: http://llvm.org/viewvc/llvm-project?rev=331910&view=rev
Log:
Allow copy elision in path concatenation

Summary:
Just port of libstdc++'s fix to libc++ fs: https://github.com/gcc-mirror/gcc/commit/e6ac4004fe49d785c63bf87aec4b095b5ce1d19f

Author of fix: Jonathan Wakely

Reviewers: EricWF, mclow.lists

Reviewed By: EricWF

Subscribers: smeenai, christof, cfe-commits, llvm-commits

Differential Revision: https://reviews.llvm.org/D46593

Modified:
    libcxx/trunk/include/experimental/filesystem

Modified: libcxx/trunk/include/experimental/filesystem
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/experimental/filesystem?rev=331910&r1=331909&r2=331910&view=diff
==============================================================================
--- libcxx/trunk/include/experimental/filesystem (original)
+++ libcxx/trunk/include/experimental/filesystem Wed May  9 11:57:17 2018
@@ -1140,7 +1140,9 @@ bool operator>=(const path& __lhs, const
 
 inline _LIBCPP_INLINE_VISIBILITY
 path operator/(const path& __lhs, const path& __rhs) {
-    return path(__lhs) /= __rhs;
+    path __result(__lhs);
+    __result /= __rhs;
+    return __result;
 }
 
 template <class _Source>