$ cat fix-msan-with-musl.patch

From 8904ed80c262e973c0da7758337f586c9854f38a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=B6ren=20Tempel?= <soeren+git@soeren-tempel.net>
Date: Thu, 15 Jun 2023 09:28:57 +0200
Subject: [PATCH] msan: fix ifdef guard for getrlimit etc interceptors

These interceptors need struct_ustat_sz, struct_rlimit64_sz, and
struct_statvfs64_sz which are defined in the following file:

	compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp

However, these variables are only defined for GLIBC sanitizers.
As such, if we attempt to use MSAN on a Linux system that does not
utilize glibc (e.g. Alpine Linux) then we will get a linker error
complaining about undefined references to __sanitizer::struct_rlimit64_sz
and __sanitizer::struct_rlimit64_sz.

This patch fixes this by only defining the interceptors that require
these constants if SANITIZER_GLIBC is defined. Thereby aligning the
macro guards of msan_interceptors.cpp with those of
sanitizer_platform_limits_posix.cpp.
---
 compiler-rt/lib/msan/msan_interceptors.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler-rt/lib/msan/msan_interceptors.cpp b/compiler-rt/lib/msan/msan_interceptors.cpp
index 6f57c33ee..349eff549 100644
--- a/compiler-rt/lib/msan/msan_interceptors.cpp
+++ b/compiler-rt/lib/msan/msan_interceptors.cpp
@@ -908,7 +908,7 @@ INTERCEPTOR(int, getrlimit, int resource, void *rlim) {
   INTERCEPTOR_GETRLIMIT_BODY(getrlimit, resource, rlim);
 }
 
-#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
+#if SANITIZER_GLIBC
 INTERCEPTOR(int, __getrlimit, int resource, void *rlim) {
   INTERCEPTOR_GETRLIMIT_BODY(__getrlimit, resource, rlim);
 }