On Tue, Nov 5, 2013 at 9:44 AM, Bob Wilson <bob.wil...@apple.com> wrote:
> On OS X the libc++ headers are meant to be installed along with clang. If > you check out the libc++ sources in the LLVM projects directory, they > should be installed in the right place. > Thanks, that makes sense. Should http://clang.llvm.org/get_started.htmlmention checking out libc++, since it sounds that's now a requirement on OS X? > > On Nov 5, 2013, at 9:42 AM, Howard Hinnant <hhinn...@apple.com> wrote: > > > When I use tot clang, (and want libc++), I will forbid clang from > looking the std::headers, and then tell it exactly where the headers are, > e.g.: > > > > $ clang++ -stdlib=libc++ -std=c++11 -nostdinc++ -I../libcxx/include > test.cpp > > > > Howard > > > > On Nov 5, 2013, at 12:35 PM, Nico Weber <tha...@chromium.org> wrote: > > > >> In addition to the performance issues, libc++ apparently can't be found > by clang: http://llvm.org/bugs/show_bug.cgi?id=17821 > >> > >> > >> On Sat, Nov 2, 2013 at 10:35 PM, Bob Wilson <bob.wil...@apple.com> > wrote: > >> I’m not familiar with those performance issues, so I’m CC’ing Howard in > case he can provide any details on those issues. In general, we’re in the > process of migrating away from libstdc++ on OS X and iOS, so we really do > want the default to be libc++ regardless of the language mode. If you have > particularly performance sensitive code, you can always choose to use > libstdc++. > >> > >> On Nov 2, 2013, at 7:05 PM, Nico Weber <tha...@chromium.org> wrote: > >> > >>> Thanks for upstreaming this! > >>> > >>> Should this only happen in C++11 mode? libc++ seems to be measurably > slower than libstdc++ in C++03 mode (PR17703, PR14554, PR14555). > >>> > >>> > >>> On Sat, Nov 2, 2013 at 4:19 PM, Bob Wilson <bob.wil...@apple.com> > wrote: > >>> Author: bwilson > >>> Date: Sat Nov 2 18:19:53 2013 > >>> New Revision: 193934 > >>> > >>> URL: http://llvm.org/viewvc/llvm-project?rev=193934&view=rev > >>> Log: > >>> Default to use libc++ on OS X 10.9+ and iOS 7+. > >>> > >>> Modified: > >>> cfe/trunk/lib/Driver/ToolChains.cpp > >>> cfe/trunk/test/PCH/cxx-typeid.cpp > >>> > >>> Modified: cfe/trunk/lib/Driver/ToolChains.cpp > >>> URL: > http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/ToolChains.cpp?rev=193934&r1=193933&r2=193934&view=diff > >>> > ============================================================================== > >>> --- cfe/trunk/lib/Driver/ToolChains.cpp (original) > >>> +++ cfe/trunk/lib/Driver/ToolChains.cpp Sat Nov 2 18:19:53 2013 > >>> @@ -839,6 +839,12 @@ DerivedArgList *Darwin::TranslateArgs(co > >>> } > >>> } > >>> > >>> + // Default to use libc++ on OS X 10.9+ and iOS 7+. > >>> + if (((isTargetMacOS() && !isMacosxVersionLT(10, 9)) || > >>> + (isTargetIPhoneOS() && !isIPhoneOSVersionLT(7, 0))) && > >>> + !Args.getLastArg(options::OPT_stdlib_EQ)) > >>> + DAL->AddJoinedArg(0, Opts.getOption(options::OPT_stdlib_EQ), > "libc++"); > >>> + > >>> // Validate the C++ standard library choice. > >>> CXXStdlibType Type = GetCXXStdlibType(*DAL); > >>> if (Type == ToolChain::CST_Libcxx) { > >>> > >>> Modified: cfe/trunk/test/PCH/cxx-typeid.cpp > >>> URL: > http://llvm.org/viewvc/llvm-project/cfe/trunk/test/PCH/cxx-typeid.cpp?rev=193934&r1=193933&r2=193934&view=diff > >>> > ============================================================================== > >>> --- cfe/trunk/test/PCH/cxx-typeid.cpp (original) > >>> +++ cfe/trunk/test/PCH/cxx-typeid.cpp Sat Nov 2 18:19:53 2013 > >>> @@ -1,8 +1,8 @@ > >>> // Test this without pch. > >>> -// RUN: %clang_cc1 -include %S/cxx-typeid.h -fsyntax-only -verify %s > >>> +// RUN: %clang_cc1 -include %S/cxx-typeid.h -fsyntax-only > -stdlib=libstdc++ -verify %s > >>> > >>> -// RUN: %clang_cc1 -x c++-header -emit-pch -o %t.pch %S/cxx-typeid.h > >>> -// RUN: %clang_cc1 -include-pch %t.pch -fsyntax-only -verify %s > >>> +// RUN: %clang_cc1 -x c++-header -emit-pch -stdlib=libstdc++ -o > %t.pch %S/cxx-typeid.h > >>> +// RUN: %clang_cc1 -include-pch %t.pch -fsyntax-only > -stdlib=libstdc++ -verify %s > >>> > >>> // expected-no-diagnostics > >>> > >>> > >>> > >>> _______________________________________________ > >>> cfe-commits mailing list > >>> cfe-commits@cs.uiuc.edu > >>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits > >>> > >> > >> > > > >
_______________________________________________ cfe-commits mailing list cfe-commits@cs.uiuc.edu http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits
