[libc++] Mark charconv test as unsupported under msan

[ldionne]

No description provided.

[ldionne]

This seems to have started happening recently, probably around the time we landed hand-in-hand. Any clues @michaelrj-google @mordante ?

[llvmbot]

@llvm/pr-subscribers-libcxx

Author: Louis Dionne (ldionne)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/116933.diff

1 Files Affected:

• (modified) libcxx/test/std/utilities/charconv/charconv.msvc/test.pass.cpp (+3)

diff --git a/libcxx/test/std/utilities/charconv/charconv.msvc/test.pass.cpp b/libcxx/test/std/utilities/charconv/charconv.msvc/test.pass.cpp
index c294a40ce71ce5..9279511e46b114 100644
--- a/libcxx/test/std/utilities/charconv/charconv.msvc/test.pass.cpp
+++ b/libcxx/test/std/utilities/charconv/charconv.msvc/test.pass.cpp
@@ -11,6 +11,9 @@
 // TODO Investigate why this fails
 // UNSUPPORTED: windows
 
+// This test times out under msan
+// UNSUPPORTED: msan
+
 // to_chars requires functions in the dylib that have not been introduced in older
 // versions of the dylib on macOS.
 // XFAIL: availability-fp_to_chars-missing

[frederick-vs-ja]

I guess we can split the test into small ones. Recently, the test could sometimes pass, but took more than 1400s to run.

• https://github.com/llvm/llvm-project/actions/runs/11732482000/job/32686034023
• https://github.com/llvm/llvm-project/actions/runs/11889186710/job/33131453681
• https://github.com/llvm/llvm-project/actions/runs/11896342811/job/33150299761

[michaelrj-google]

I'm fine with disabling this for now, though I'm not sure why it would be so slow under msan. I'll look into this when I get a chance.