[compiler-rt] Fix fuzzer tests on Windows

This fixes a link-time mismatch between the clang_rt.fuzzer-x86_64.lib
and the fuzzer tests, which happen to build with -fsanitize=address.

See: https://learn.microsoft.com/en-us/cpp/sanitizers/error-container-overflow?view=msvc-170

Author: aganea

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

@@ -89,6 +89,16 @@ def generate_compiler_cmd(is_cpp=True, fuzzer_enabled=True, msan_enabled=False):
     if fuzzer_enabled:
         sanitizers.append("fuzzer")
     sanitizers_cmd = "-fsanitize=%s" % ",".join(sanitizers)
+
+    # Since clang_rt.fuzzer-x86_64.lib is built without -fsanitize=address and
+    # we're building with that flag here, the MSVC STL needs all libs to be
+    # compiled with the same -fsanitize flags, see:
+    # https://learn.microsoft.com/en-us/cpp/sanitizers/error-container-overflow?view=msvc-170
+    # Avoids linker error:
+    #   /failifmismatch: mismatch detected for 'annotate_string'
+    if "windows" in config.available_features:
+        extra_cmd = extra_cmd + " -D_DISABLE_VECTOR_ANNOTATION -D_DISABLE_STRING_ANNOTATION"
+
     return " ".join(
         [
             compiler_cmd,