Author: phosek Date: Sat Feb 16 18:42:48 2019 New Revision: 354210 URL: http://llvm.org/viewvc/llvm-project?rev=354210&view=rev Log: [Driver][Gnu] Support -nolibc flag
This can be used to disable libc linking. This flag is supported by GCC since version 9 as well as some Clang target toolchains. Differential Revision: https://reviews.llvm.org/D58326 Added: cfe/trunk/test/Driver/nolibc.c Modified: cfe/trunk/lib/Driver/ToolChains/Gnu.cpp cfe/trunk/test/Driver/nodefaultlib.c Modified: cfe/trunk/lib/Driver/ToolChains/Gnu.cpp URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/ToolChains/Gnu.cpp?rev=354210&r1=354209&r2=354210&view=diff ============================================================================== --- cfe/trunk/lib/Driver/ToolChains/Gnu.cpp (original) +++ cfe/trunk/lib/Driver/ToolChains/Gnu.cpp Sat Feb 16 18:42:48 2019 @@ -518,7 +518,8 @@ void tools::gnutools::Linker::ConstructJ if (Args.hasArg(options::OPT_fsplit_stack)) CmdArgs.push_back("--wrap=pthread_create"); - CmdArgs.push_back("-lc"); + if (!Args.hasArg(options::OPT_nolibc)) + CmdArgs.push_back("-lc"); // Add IAMCU specific libs, if needed. if (IsIAMCU) Modified: cfe/trunk/test/Driver/nodefaultlib.c URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/nodefaultlib.c?rev=354210&r1=354209&r2=354210&view=diff ============================================================================== --- cfe/trunk/test/Driver/nodefaultlib.c (original) +++ cfe/trunk/test/Driver/nodefaultlib.c Sat Feb 16 18:42:48 2019 @@ -1,4 +1,4 @@ -// RUN: %clang -target i686-pc-linux-gnu -### -nodefaultlibs %s 2>&1 | FileCheck -check-prefix=TEST1 %s +// RUN: %clang -target i686-pc-linux-gnu -### -rtlib=libgcc -nodefaultlibs %s 2>&1 | FileCheck -check-prefix=TEST1 %s // TEST1-NOT: start-group // TEST1-NOT: "-lgcc" // TEST1-NOT: "-lc" Added: cfe/trunk/test/Driver/nolibc.c URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/nolibc.c?rev=354210&view=auto ============================================================================== --- cfe/trunk/test/Driver/nolibc.c (added) +++ cfe/trunk/test/Driver/nolibc.c Sat Feb 16 18:42:48 2019 @@ -0,0 +1,5 @@ +// RUN: %clang -target i686-pc-linux-gnu -### -rtlib=libgcc -nolibc %s 2>&1 | FileCheck %s +// CHECK: crtbegin +// CHECK: "-lgcc" +// CHECK-NOT: "-lc" +// CHECK: crtend _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
