Hello, I was trying to see how Clang in -std=c++98 would handle libc++ and ran into some trouble. GCC enables a substantial amount of C++ functionality when inside of system headers in addition to suppressing warnings. Clang however only suppresses warnings and relies on 0x features to be enabled with ExtWarns in 98 mode in order for them to work in system headers. The end result is that while Clang is fine with the variadic templates, it barfs on several other constructs. One is the use of 'vector<vector<int>>'-style closing angle brackets. I've attached a patch, constructed with our fixit rewriter, that makes all of those contain the mandated space. Chris indicated on IRC that this should likely just be avoided in libc++.
The other major blocker is that R-value references aren't an extension but are used heavily in libc++. Should these also become an extension, or should we add more robust survival tactics in system headers much as GCC does? One more small blocker was the use of default template parameter arguments in function templates. Same question as to how best to proceed. Thanks, -Chandler
fix_close_angle_angle.patch
Description: Binary data
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