From 1634a9346565ff133cdc74141cfa6c2460ec86a3 Mon Sep 17 00:00:00 2001
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From: Khem Raj <raj.khem@gmail.com>
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Date: Wed, 31 Jul 2019 22:51:39 -0700
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Subject: [PATCH] clang: Add -lpthread and -ldl along with -lunwind for static
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linking
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When doing static liking with --unwindlib=libunwind -static we encounter
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undefined symbols
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libunwind/src/RWMutex.hpp:68: undefined reference to `pthread_rwlock_wrlock'
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and
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libunwind/src/AddressSpace.hpp:597: undefined reference to `dladdr'
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therefore we need to link in libpthread and libdl to fill these symbols
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Signed-off-by: Khem Raj <raj.khem@gmail.com>
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---
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clang/lib/Driver/ToolChains/CommonArgs.cpp | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp
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index 83cab3ac00cb..367e8603ff70 100644
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--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
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+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
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@@ -1449,6 +1449,8 @@ static void AddUnwindLibrary(const ToolChain &TC, const Driver &D,
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CmdArgs.push_back("-lunwind");
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} else if (LGT == LibGccType::StaticLibGcc) {
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CmdArgs.push_back("-l:libunwind.a");
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+ CmdArgs.push_back("-lpthread");
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+ CmdArgs.push_back("-ldl");
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} else if (TC.getTriple().isOSCygMing()) {
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if (LGT == LibGccType::SharedLibGcc)
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CmdArgs.push_back("-l:libunwind.dll.a");
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