[libc-commits] [libc] [libc] Fix WEOF and fix 1'000'000 error messages on test failure (PR #147928)

[William Huynh via libc-commits]

https://github.com/saturn691 created https://github.com/llvm/llvm-project/pull/147928

1. WEOF is defined as a `wint_t` by the C standard. On certain architectures, the test won't compile on `-Wall`. This fixes it.
2. If `testSubnormalRange` fails, it will spit out way too many error messages, which overwhelms my test environment. I reduce this to 1k for now.

>From 288b750c4cec2472376e6ad3082c5c5ebf2dcf80 Mon Sep 17 00:00:00 2001
From: William Huynh <William.Huynh at arm.com>
Date: Thu, 10 Jul 2025 10:50:57 +0100
Subject: [PATCH] [libc] Fix WEOF and fix 1'000'000 error messages on test
 failure

---
 libc/include/llvm-libc-macros/wchar-macros.h  | 2 +-
 libc/test/src/math/smoke/RoundToIntegerTest.h | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/libc/include/llvm-libc-macros/wchar-macros.h b/libc/include/llvm-libc-macros/wchar-macros.h
index 5b211f5276b62..21a3453ce4c2c 100644
--- a/libc/include/llvm-libc-macros/wchar-macros.h
+++ b/libc/include/llvm-libc-macros/wchar-macros.h
@@ -10,7 +10,7 @@
 #define LLVM_LIBC_MACROS_WCHAR_MACROS_H
 
 #ifndef WEOF
-#define WEOF 0xffffffffu
+#define WEOF ((wint_t)(0xffffffffu))
 #endif
 
 #endif // LLVM_LIBC_MACROS_WCHAR_MACROS_H
diff --git a/libc/test/src/math/smoke/RoundToIntegerTest.h b/libc/test/src/math/smoke/RoundToIntegerTest.h
index 745ccbc748ecd..2b460aef6ef32 100644
--- a/libc/test/src/math/smoke/RoundToIntegerTest.h
+++ b/libc/test/src/math/smoke/RoundToIntegerTest.h
@@ -113,7 +113,8 @@ class RoundToIntegerTestTemplate
   }
 
   void testSubnormalRange(RoundToIntegerFunc func) {
-    constexpr int COUNT = 1'000'001;
+    // Arbitrary, trades off completeness with testing time (esp. on failure)
+    constexpr int COUNT = 1'000;
     constexpr StorageType STEP = LIBC_NAMESPACE::cpp::max(
         static_cast<StorageType>((MAX_SUBNORMAL - MIN_SUBNORMAL) / COUNT),
         StorageType(1));