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.
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
