Frontend driver patch from Edward O'Callaghan https://llvm.org/bugs/show_bug.cgi?id=21538 Index: include/clang/Driver/Driver.h =================================================================== --- cfe-3.7.1.src/include/clang/Driver/Driver.h (revision 211898) +++ cfe-3.7.1.src/include/clang/Driver/Driver.h (working copy) @@ -325,6 +325,14 @@ // FIXME: This should be in CompilationInfo. std::string GetFilePath(const char *Name, const ToolChain &TC) const; + /// GetCompilerRTPath - Find Compiler-RT library path + /// + /// \param TC - The provided tool chain for additional information on + /// directories to search. + // + // FIXME: This should be in CompilationInfo. + std::string GetCompilerRTPath(const ToolChain &TC) const; + /// GetProgramPath - Lookup \p Name in the list of program search paths. /// /// \param TC - The provided tool chain for additional information on Index: include/clang/Driver/Options.td =================================================================== --- cfe-3.7.1.src/include/clang/Driver/Options.td (revision 211898) +++ cfe-3.7.1.src/include/clang/Driver/Options.td (working copy) @@ -1269,6 +1269,8 @@ HelpText<"Enable Objective-C Ivar layout bitmap print trace">; def print_libgcc_file_name : Flag<["-", "--"], "print-libgcc-file-name">, HelpText<"Print the library path for \"libgcc.a\"">; +def print_librt_file_name : Flag<["-", "--"], "print-librt-file-name">, + HelpText<"Print the library path for \"libclang_rt.builtins-ARCH.a\"">; def print_multi_directory : Flag<["-", "--"], "print-multi-directory">; def print_multi_lib : Flag<["-", "--"], "print-multi-lib">; def print_multi_os_directory : Flag<["-", "--"], "print-multi-os-directory">; Index: lib/Driver/Driver.cpp =================================================================== --- cfe-3.7.1.src/lib/Driver/Driver.cpp (revision 211898) +++ cfe-3.7.1.src/lib/Driver/Driver.cpp (working copy) @@ -756,6 +756,11 @@ return false; } + if (C.getArgs().hasArg(options::OPT_print_librt_file_name)) { + llvm::outs() << GetCompilerRTPath(TC) << "\n"; + return false; + } + if (C.getArgs().hasArg(options::OPT_print_multi_lib)) { const MultilibSet &Multilibs = TC.getMultilibs(); @@ -1820,6 +1825,26 @@ return Name; } +std::string Driver::GetCompilerRTPath(const ToolChain &TC) const { + // The runtimes are located in the OS-specific resource directory. + SmallString<128> Res(TC.getDriver().ResourceDir); + const llvm::Triple &Triple = TC.getTriple(); + + // TC.getOS() yield "freebsd10.0" whereas "freebsd" is expected. + StringRef OSLibName = (Triple.getOS() == llvm::Triple::FreeBSD) ? + "freebsd" : TC.getOS(); + llvm::sys::path::append(Res, "lib", OSLibName); + + StringRef archName = TC.getArchName(); + // Until ARM libraries are build separately, we have them all in one library + if (TC.getArch() == llvm::Triple::arm || + TC.getArch() == llvm::Triple::armeb) + archName = "arm"; + + llvm::sys::path::append(Res, Twine("libclang_rt.builtins-") + archName + ".a"); + return Res.str(); +} + std::string Driver::GetProgramPath(const char *Name, const ToolChain &TC) const { // FIXME: Needs a better variable than DefaultTargetTriple