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From 262b287fca475f78c91afb41824adeb075c2195d Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
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
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
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 37ec7346857..c849b2242e9 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -1211,8 +1211,13 @@ static void AddUnwindLibrary(const ToolChain &TC, const Driver &D,
case ToolChain::UNW_CompilerRT:
if (LGT == LibGccType::StaticLibGcc)
CmdArgs.push_back("-l:libunwind.a");
- else
+ else {
CmdArgs.push_back("-l:libunwind.so");
+ if (Args.hasArg(options::OPT_static)) {
+ CmdArgs.push_back("-lpthread");
+ CmdArgs.push_back("-ldl");
+ }
+ }
break;
}
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