1 files changed, 40 insertions, 0 deletions

diff --git a/recipes-devtools/clang/clang/0016-clang-Add-lpthread-and-ldl-along-with-lunwind-for-st.patch b/recipes-devtools/clang/clang/0016-clang-Add-lpthread-and-ldl-along-with-lunwind-for-st.patch
new file mode 100644
index 0000000..90572d9
--- /dev/null
+++ b/recipes-devtools/clang/clang/0016-clang-Add-lpthread-and-ldl-along-with-lunwind-for-st.patch
@@ -0,0 +1,40 @@
+From 751e7b29c02c935987cc9b4d5b17a9db576737f0 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;
+   }
+