Merging r352234:

------------------------------------------------------------------------
r352234 | dim | 2019-01-25 20:36:47 +0100 (Fri, 25 Jan 2019) | 38 lines

Fix XRayTest link on FreeBSD (and likely NetBSD too)

Summary:
As reported on llvm-testers, during 8.0.0-rc1 testing I got errors while
building of `XRayTest`, during `check-all`:

```
[100%] Generating XRayTest-x86_64-Test
/home/dim/llvm/8.0.0/rc1/Phase3/Release/llvmCore-8.0.0-rc1.obj/./lib/libLLVMSupport.a(Signals.cpp.o): In function `llvm::sys::PrintStackTrace(llvm::raw_ostream&)':
Signals.cpp:(.text._ZN4llvm3sys15PrintStackTraceERNS_11raw_ostreamE+0x24): undefined reference to `backtrace'
Signals.cpp:(.text._ZN4llvm3sys15PrintStackTraceERNS_11raw_ostreamE+0x254): undefined reference to `llvm::itaniumDemangle(char const*, char*, unsigned long*, int*)'
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
gmake[3]: *** [projects/compiler-rt/lib/xray/tests/unit/CMakeFiles/TXRayTest-x86_64-Test.dir/build.make:73: projects/compiler-rt/lib/xray/tests/unit/XRayTest-x86_64-Test] Error 1
gmake[3]: Target 'projects/compiler-rt/lib/xray/tests/unit/CMakeFiles/TXRayTest-x86_64-Test.dir/build' not remade because of errors.
gmake[2]: *** [CMakeFiles/Makefile2:33513: projects/compiler-rt/lib/xray/tests/unit/CMakeFiles/TXRayTest-x86_64-Test.dir/all] Error 2
gmake[2]: Target 'CMakeFiles/check-all.dir/all' not remade because of errors.
gmake[1]: *** [CMakeFiles/Makefile2:737: CMakeFiles/check-all.dir/rule] Error 2
gmake[1]: Target 'check-all' not remade because of errors.
gmake: *** [Makefile:277: check-all] Error 2
[Release Phase3] check-all failed
```

This is because the `backtrace` function requires `-lexecinfo` on BSD
platforms.  To fix this, detect the `execinfo` library in
`cmake/config-ix.cmake`, and add it to the unit test link flags.

Additionally, since the code in `sys::PrintStackTrace` makes use of
`itaniumDemangle`, also add `-lLLVMDemangle`.  (Note that this is more
of a general problem with libLLVMSupport, but I'm looking for a quick
fix now so it can be merged to the 8.0 branch.)

Reviewers: dberris, hans, mgorny, samsonov

Reviewed By: dberris

Subscribers: krytarowski, delcypher, erik.pilkington, #sanitizers, emaste, llvm-commits

Differential Revision: https://reviews.llvm.org/D57181
------------------------------------------------------------------------


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/release_80@352251 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 3 insertions, 1 deletions

diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
index db5c4645d..5b9433877 100644
--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -118,6 +118,7 @@ check_library_exists(dl dlopen "" COMPILER_RT_HAS_LIBDL)
 check_library_exists(rt shm_open "" COMPILER_RT_HAS_LIBRT)
 check_library_exists(m pow "" COMPILER_RT_HAS_LIBM)
 check_library_exists(pthread pthread_create "" COMPILER_RT_HAS_LIBPTHREAD)
+check_library_exists(execinfo backtrace "" COMPILER_RT_HAS_LIBEXECINFO)
 
 # Look for terminfo library, used in unittests that depend on LLVMSupport.
 if(LLVM_ENABLE_TERMINFO)
diff --git a/lib/xray/tests/CMakeLists.txt b/lib/xray/tests/CMakeLists.txt
index 89a2b3b01..deddc5101 100644
--- a/lib/xray/tests/CMakeLists.txt
+++ b/lib/xray/tests/CMakeLists.txt
@@ -71,13 +71,14 @@ if (NOT APPLE)
     endforeach()
 
     # We also add the actual libraries to link as dependencies.
-    list(APPEND XRAY_UNITTEST_LINK_FLAGS -lLLVMXRay -lLLVMSupport -lLLVMTestingSupport)
+    list(APPEND XRAY_UNITTEST_LINK_FLAGS -lLLVMXRay -lLLVMSupport -lLLVMDemangle -lLLVMTestingSupport)
   endif()
 
   append_list_if(COMPILER_RT_HAS_LIBM -lm XRAY_UNITTEST_LINK_FLAGS)
   append_list_if(COMPILER_RT_HAS_LIBRT -lrt XRAY_UNITTEST_LINK_FLAGS)
   append_list_if(COMPILER_RT_HAS_LIBDL -ldl XRAY_UNITTEST_LINK_FLAGS)
   append_list_if(COMPILER_RT_HAS_LIBPTHREAD -pthread XRAY_UNITTEST_LINK_FLAGS)
+  append_list_if(COMPILER_RT_HAS_LIBEXECINFO -lexecinfo XRAY_UNITTEST_LINK_FLAGS)
 endif()
 
 macro(add_xray_unittest testname)