[asan][windows][tests] support MSVC compiler-id in asan tests (llvm#1…

…09706)

This follows up on llvm#108255 to
allow actually running the test suite with MSVC. Note, however, that
MSVC can't yet build compiler-rt, most tests don't yet pass with msvc,
and building and testing with different compilers is ill-supported.
Follow ups will fix the first two issues, the third is future work.

Note that `/Zi` is removed from the clang-cl command line, but lit as a
whole adds `-gcodeview`, so there should still be debug info.

compiler-rt/test/asan/lit.cfg.py

@@ -153,12 +153,16 @@ def build_invocation(compile_flags, with_lto=False):
 if platform.system() == "Windows":
  # MSVC-specific tests might also use the clang-cl.exe driver.
  if target_is_msvc:
- clang_cl_cxxflags = [
- "-Wno-deprecated-declarations",
- "-WX",
- "-D_HAS_EXCEPTIONS=0",
- "-Zi",
- ] + target_cflags
+ clang_cl_cxxflags = (
+ [
+ "-WX",
+ "-D_HAS_EXCEPTIONS=0",
+ ]
+ + config.debug_info_flags
+ + target_cflags
+ )
+ if config.compiler_id != "MSVC":
+ clang_cl_cxxflags = ["-Wno-deprecated-declarations"] + clang_cl_cxxflags
  clang_cl_asan_cxxflags = ["-fsanitize=address"] + clang_cl_cxxflags
  if config.asan_dynamic:
  clang_cl_asan_cxxflags.append("-MD")
@@ -286,6 +290,12 @@ def build_invocation(compile_flags, with_lto=False):
  [config.compiler_rt_libdir, os.environ.get("PATH", "")]
  )
 
+# msvc needs to be instructed where the compiler-rt libraries are
+if config.compiler_id == "MSVC":
+ config.environment["LIB"] = os.path.pathsep.join(
+ [config.compiler_rt_libdir, config.environment.get("LIB", "")]
+ )
+
 # Default test suffixes.
 config.suffixes = [".c", ".cpp"]