[ASan] Recognize WASI as a platform with 64-bit off_t

[kateinoigakukun]

WASI defines off_t as 64-bit signed integers to support files larger than 2 GiB. https://github.com/WebAssembly/wasi-libc/blob/wasi-sdk-25/libc-bottom-half/headers/public/__typedef_off_t.h

[llvmbot]

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: Yuta Saito (kateinoigakukun)

Changes

WASI defines off_t as 64-bit signed integers to support files larger than 2 GiB. https://github.com/WebAssembly/wasi-libc/blob/wasi-sdk-25/libc-bottom-half/headers/public/__typedef_off_t.h

---

Full diff: https://github.com/llvm/llvm-project/pull/144441.diff

1 Files Affected:

• (modified) compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h (+2-1)

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h b/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h
index fff60c96f632f..5a5d44e7f895e 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h
@@ -190,7 +190,8 @@ typedef int pid_t;
 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_APPLE ||             \
     (SANITIZER_SOLARIS && (defined(_LP64) || _FILE_OFFSET_BITS == 64)) || \
     (SANITIZER_LINUX && !SANITIZER_GLIBC && !SANITIZER_ANDROID) ||        \
-    (SANITIZER_LINUX && (defined(__x86_64__) || defined(__hexagon__)))
+    (SANITIZER_LINUX && (defined(__x86_64__) || defined(__hexagon__))) || \
+    SANITIZER_WASI
 typedef u64 OFF_T;
 #else
 typedef uptr OFF_T;

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