From bc21d17ff434af5efdb2fac86392862230c6f9e6 Mon Sep 17 00:00:00 2001 From: Khem Raj Date: Wed, 31 Jul 2019 22:51:39 -0700 Subject: [PATCH] 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 Upstream-Status: Pending Signed-off-by: Khem Raj --- clang/lib/Driver/ToolChains/CommonArgs.cpp | 2 ++ 1 file changed, 2 insertions(+) diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp index 2b916f000336..de823347a527 100644 --- a/clang/lib/Driver/ToolChains/CommonArgs.cpp +++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp @@ -2179,6 +2179,8 @@ static void AddUnwindLibrary(const ToolChain &TC, const Driver &D, CmdArgs.push_back("-lunwind"); } else if (LGT == LibGccType::StaticLibGcc) { CmdArgs.push_back("-l:libunwind.a"); + CmdArgs.push_back("-lpthread"); + CmdArgs.push_back("-ldl"); } else if (LGT == LibGccType::SharedLibGcc) { if (TC.getTriple().isOSCygMing()) CmdArgs.push_back("-l:libunwind.dll.a");