From a1d6f91cac4f24890081be8f594eef7ef09919e3 Mon Sep 17 00:00:00 2001 From: Khem Raj Date: Wed, 31 Jul 2019 22:51:39 -0700 Subject: [PATCH 16/24] clang: Add -lpthread and -ldl along with -lunwind for static linking When doing static liking with --unwindlib=libunwind -static we encounter undefined symbols libunwind/src/RWMutex.hpp:68: undefined reference to `pthread_rwlock_wrlock' and libunwind/src/AddressSpace.hpp:597: undefined reference to `dladdr' therefore we need to link in libpthread and libdl to fill these symbols Signed-off-by: Khem Raj --- clang/lib/Driver/ToolChains/CommonArgs.cpp | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp index 1cac5a0822a..29fe4a33a14 100644 --- a/clang/lib/Driver/ToolChains/CommonArgs.cpp +++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp @@ -1275,8 +1275,13 @@ static void AddUnwindLibrary(const ToolChain &TC, const Driver &D, // Let the linker choose between libunwind.dll.a and libunwind.a // depending on what's available, and depending on the -static flag CmdArgs.push_back("-lunwind"); - } else + } else { CmdArgs.push_back("-l:libunwind.so"); + if (Args.hasArg(options::OPT_static)) { + CmdArgs.push_back("-lpthread"); + CmdArgs.push_back("-ldl"); + } + } break; } -- 2.27.0