From d630c5dde1026eee0e5a1fb886791adf21ab95a6 Mon Sep 17 00:00:00 2001
From: Petr Hosek <phosek@chromium.org>
Date: Fri, 28 Jul 2017 03:39:38 +0000
Subject: Support compiler-rt builtins

This change adds support for compiler-rt builtins as an alternative
compiler runtime to libgcc.

Differential Revision: https://reviews.llvm.org/D35165

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309361 91177308-0d34-0410-b5e6-96231b3b80d8
---
 cmake/Modules/HandleCompilerRT.cmake | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 cmake/Modules/HandleCompilerRT.cmake

(limited to 'cmake/Modules')

diff --git a/cmake/Modules/HandleCompilerRT.cmake b/cmake/Modules/HandleCompilerRT.cmake
new file mode 100644
index 000000000..cff5031ec
--- /dev/null
+++ b/cmake/Modules/HandleCompilerRT.cmake
@@ -0,0 +1,21 @@
+function(find_compiler_rt_library name dest)
+  set(dest "" PARENT_SCOPE)
+  set(CLANG_COMMAND ${CMAKE_CXX_COMPILER} ${SANITIZER_COMMON_CFLAGS}
+      "--rtlib=compiler-rt" "--print-libgcc-file-name")
+  if (CMAKE_CXX_COMPILER_ID MATCHES Clang AND CMAKE_CXX_COMPILER_TARGET)
+    list(APPEND CLANG_COMMAND "--target=${CMAKE_CXX_COMPILER_TARGET}")
+  endif()
+  execute_process(
+      COMMAND ${CLANG_COMMAND}
+      RESULT_VARIABLE HAD_ERROR
+      OUTPUT_VARIABLE LIBRARY_FILE
+  )
+  string(STRIP "${LIBRARY_FILE}" LIBRARY_FILE)
+  string(REPLACE "builtins" "${name}" LIBRARY_FILE "${LIBRARY_FILE}")
+  if (NOT HAD_ERROR AND EXISTS "${LIBRARY_FILE}")
+    message(STATUS "Found compiler-rt ${name} library: ${LIBRARY_FILE}")
+    set(${dest} "${LIBRARY_FILE}" PARENT_SCOPE)
+  else()
+    message(STATUS "Failed to find compiler-rt ${name} library")
+  endif()
+endfunction()
-- 
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