http://llvm.org/bugs/show_bug.cgi?id=22625
Bug ID: 22625
Summary: Dangling StringRef in clang/lib/Driver/ToolChains.cpp
Product: clang
Version: trunk
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Driver
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 13898
--> http://llvm.org/bugs/attachment.cgi?id=13898&action=edit
Avoid constructing a temporary std::string
In Linux::AddClangSystemIncludeArgs:
std::string SysRoot = computeSysRoot();
// ...
StringRef Prefix = llvm::sys::path::is_absolute(dir) ? SysRoot : "";
The conditional operator produces a std::string rvalue (either a copy of
SysRoot or constructed from the string literal) and so the StringRef is left
dangling.
This breaks clang bootstrap when using the new non-COW std::string in GCC5 (I'm
curious why it doesn't show up with the non-COW string in libc++).
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