Author: mgorny Date: Fri Oct 7 12:08:06 2016 New Revision: 283572 URL: http://llvm.org/viewvc/llvm-project?rev=283572&view=rev Log: [Driver] Make -print-libgcc-file-name print compiler-rt lib when used
Make the -print-libgcc-file-name option print an appropriate compiler runtime library, that is libgcc.a if gcc runtime is used and an appropriate compiler-rt library if that runtime is used. The main use for this is to allow linking executables built with -nodefaultlibs (e.g. to avoid linking to the standard C++ library) to the compiler runtime library, e.g. using: clang++ ... -nodefaultlibs $(clang++ ... -print-libgcc-file-name) in which case currently a program built like this linked to the gcc runtime unconditionally. The patch fixes it to use compiler-rt libraries instead when compiler-rt is the active runtime. Differential Revision: https://reviews.llvm.org/D25338 Added: cfe/trunk/test/Driver/print-libgcc-file-name.c Modified: cfe/trunk/docs/CommandGuide/clang.rst cfe/trunk/include/clang/Driver/Options.td cfe/trunk/lib/Driver/Driver.cpp Modified: cfe/trunk/docs/CommandGuide/clang.rst URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/docs/CommandGuide/clang.rst?rev=283572&r1=283571&r2=283572&view=diff ============================================================================== --- cfe/trunk/docs/CommandGuide/clang.rst (original) +++ cfe/trunk/docs/CommandGuide/clang.rst Fri Oct 7 12:08:06 2016 @@ -394,7 +394,8 @@ Driver Options .. option:: -print-libgcc-file-name - Print the library path for "libgcc.a". + Print the library path for the currently used compiler runtime library + ("libgcc.a" or "libclang_rt.builtins.*.a"). .. option:: -print-prog-name=<name> Modified: cfe/trunk/include/clang/Driver/Options.td URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Driver/Options.td?rev=283572&r1=283571&r2=283572&view=diff ============================================================================== --- cfe/trunk/include/clang/Driver/Options.td (original) +++ cfe/trunk/include/clang/Driver/Options.td Fri Oct 7 12:08:06 2016 @@ -1861,7 +1861,8 @@ def print_file_name_EQ : Joined<["-", "- def print_ivar_layout : Flag<["-"], "print-ivar-layout">, Flags<[CC1Option]>, 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\"">; + HelpText<"Print the library path for the currently used compiler runtime " + "library (\"libgcc.a\" or \"libclang_rt.builtins.*.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">, Modified: cfe/trunk/lib/Driver/Driver.cpp URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Driver.cpp?rev=283572&r1=283571&r2=283572&view=diff ============================================================================== --- cfe/trunk/lib/Driver/Driver.cpp (original) +++ cfe/trunk/lib/Driver/Driver.cpp Fri Oct 7 12:08:06 2016 @@ -994,7 +994,15 @@ bool Driver::HandleImmediateArgs(const C } if (C.getArgs().hasArg(options::OPT_print_libgcc_file_name)) { - llvm::outs() << GetFilePath("libgcc.a", TC) << "\n"; + ToolChain::RuntimeLibType RLT = TC.GetRuntimeLibType(C.getArgs()); + switch (RLT) { + case ToolChain::RLT_CompilerRT: + llvm::outs() << TC.getCompilerRTArgString(C.getArgs(), "builtins") << "\n"; + break; + case ToolChain::RLT_Libgcc: + llvm::outs() << GetFilePath("libgcc.a", TC) << "\n"; + break; + } return false; } Added: cfe/trunk/test/Driver/print-libgcc-file-name.c URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/print-libgcc-file-name.c?rev=283572&view=auto ============================================================================== --- cfe/trunk/test/Driver/print-libgcc-file-name.c (added) +++ cfe/trunk/test/Driver/print-libgcc-file-name.c Fri Oct 7 12:08:06 2016 @@ -0,0 +1,15 @@ +// Test that -print-libgcc-file-name correctly respects -rtlib=. + +// RUN: %clang -rtlib=libgcc -print-libgcc-file-name 2>&1 \ +// RUN: | FileCheck --check-prefix=CHECK-LIBGCC %s +// CHECK-LIBGCC: libgcc.a + +// RUN: %clang -rtlib=compiler-rt -print-libgcc-file-name 2>&1 \ +// RUN: --target=x86_64-pc-linux \ +// RUN: | FileCheck --check-prefix=CHECK-CLANGRT-X8664 %s +// CHECK-CLANGRT-X8664: libclang_rt.builtins-x86_64.a + +// RUN: %clang -rtlib=compiler-rt -print-libgcc-file-name 2>&1 \ +// RUN: --target=i686-pc-linux \ +// RUN: | FileCheck --check-prefix=CHECK-CLANGRT-I686 %s +// CHECK-CLANGRT-I686: libclang_rt.builtins-i686.a _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
