recipes-devtools/clang/clang/0019-clang-Add-lpthread-and-ldl-along-with-lunwind-for-st.patch


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From a761afb9da0223ec9475288831f35c72c145a905 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 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp
index 99691cb43dc..92b3bfbd77f 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -1185,6 +1185,10 @@ static void AddUnwindLibrary(const ToolChain &TC, const Driver &D,
   }
   case ToolChain::UNW_CompilerRT:
     CmdArgs.push_back("-lunwind");
+    if (Args.hasArg(options::OPT_static)) {
+      CmdArgs.push_back("-lpthread");
+      CmdArgs.push_back("-ldl");
+    }
     break;
   }