[PATCH] D51657: [CMake] Link to compiler-rt if LIBUNWIND_USE_COMPILER_RT is ON.

[Charles Davis via Phabricator]

cdavis5x updated this revision to Diff 168687.
cdavis5x added a comment.

- Detect libgcc.


Repository:
  rUNW libunwind

https://reviews.llvm.org/D51657

Files:
  cmake/config-ix.cmake
  src/CMakeLists.txt


Index: src/CMakeLists.txt
===================================================================
--- src/CMakeLists.txt
+++ src/CMakeLists.txt
@@ -53,7 +53,12 @@
 # Generate library list.
 set(libraries)
 append_if(libraries LIBUNWIND_HAS_C_LIB c)
-append_if(libraries LIBUNWIND_HAS_GCC_S_LIB gcc_s)
+if (LIBUNWIND_USE_COMPILER_RT)
+  list(APPEND libraries "${LIBUNWIND_BUILTINS_LIBRARY}")
+else()
+  append_if(libraries LIBUNWIND_HAS_GCC_S_LIB gcc_s)
+  append_if(libraries LIBUNWIND_HAS_GCC_LIB gcc)
+endif()
 append_if(libraries LIBUNWIND_HAS_DL_LIB dl)
 if (LIBUNWIND_ENABLE_THREADS)
   append_if(libraries LIBUNWIND_HAS_PTHREAD_LIB pthread)
Index: cmake/config-ix.cmake
===================================================================
--- cmake/config-ix.cmake
+++ cmake/config-ix.cmake
@@ -7,6 +7,7 @@
 
 if (NOT LIBUNWIND_USE_COMPILER_RT)
   check_library_exists(gcc_s __gcc_personality_v0 "" LIBUNWIND_HAS_GCC_S_LIB)
+  check_library_exists(gcc __absvdi2 "" LIBUNWIND_HAS_GCC_LIB)
 endif()
 
 # libunwind is built with -nodefaultlibs, so we want all our checks to also
@@ -25,8 +26,13 @@
   if (LIBUNWIND_USE_COMPILER_RT)
     find_compiler_rt_library(builtins LIBUNWIND_BUILTINS_LIBRARY)
     list(APPEND CMAKE_REQUIRED_LIBRARIES "${LIBUNWIND_BUILTINS_LIBRARY}")
-  elseif (LIBUNWIND_HAS_GCC_S_LIB)
-    list(APPEND CMAKE_REQUIRED_LIBRARIES gcc_s)
+  else ()
+    if (LIBUNWIND_HAS_GCC_S_LIB)
+      list(APPEND CMAKE_REQUIRED_LIBRARIES gcc_s)
+    endif ()
+    if (LIBUNWIND_HAS_GCC_LIB)
+      list(APPEND CMAKE_REQUIRED_LIBRARIES gcc)
+    endif ()
   endif ()
   if (MINGW)
     # Mingw64 requires quite a few "C" runtime libraries in order for basic


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