Significantly change the way we build ASan unittests in CMake

build tree. Now just-built Clang is used to:
  1) compile instrumented sources (as before);
  2) compile non-instrumented sources;
  3) compile our own instrumented version of googletest;
  4) link it all together using -fsanitize=address flag
     (instead of trying to copy linker behavior in
      CMake build rules).

This makes ASan unittests pretty much self-consistent
and independent of other LLVM libraries.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@170541 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 0 deletions

diff --git a/cmake/Modules/CompilerRTCompile.cmake b/cmake/Modules/CompilerRTCompile.cmake
new file mode 100644
index 000000000..2794cabe5
--- /dev/null
+++ b/cmake/Modules/CompilerRTCompile.cmake
@@ -0,0 +1,16 @@
+include(LLVMParseArguments)
+
+# Compile a source into an object file with just-built Clang using
+# a provided compile flags and dependenices.
+# clang_compile(<object> <source>
+#               CFLAGS <list of compile flags>
+#               DEPS <list of dependencies>)
+macro(clang_compile object_file source)
+  parse_arguments(SOURCE "CFLAGS;DEPS" "" ${ARGN})
+  get_filename_component(source_rpath ${source} REALPATH)
+  add_custom_command(
+    OUTPUT ${object_file}
+    COMMAND clang ${SOURCE_CFLAGS} -c -o "${object_file}" ${source_rpath}
+    MAIN_DEPENDENCY ${source}
+    DEPENDS clang ${SOURCE_DEPS})
+endmacro()