[libc] Make static_assert available even if NDEBUG is set

[petrhosek]

This addresses an issue introduced in #98826 where static_assert was made defined only when NDEBUG is not set which is different from all other C libraries and breaks any code that uses static_assert and doesn't guard it with NDEBUG.

[llvmbot]

@llvm/pr-subscribers-libc

Author: Petr Hosek (petrhosek)

Changes

This addresses an issue introduced in #98826 where static_assert was made defined only when NDEBUG is not set which is different from all other C libraries and breaks any code that uses static_assert and doesn't guard it with NDEBUG.

---

Full diff: https://github.com/llvm/llvm-project/pull/99742.diff

1 Files Affected:

• (modified) libc/include/assert.h.def (+4-7)

diff --git a/libc/include/assert.h.def b/libc/include/assert.h.def
index 9c924c7f58545..d5ae14a1cd810 100644
--- a/libc/include/assert.h.def
+++ b/libc/include/assert.h.def
@@ -12,22 +12,19 @@
 // This file may be usefully included multiple times to change assert()'s
 // definition based on NDEBUG.
 
-
-#undef assert
-#ifdef NDEBUG
-#define assert(e) (void)0
-#else
-
 #ifndef __cplusplus
 #undef static_assert
 #define static_assert _Static_assert
 #endif
 
+#undef assert
+#ifdef NDEBUG
+#define assert(e) (void)0
+#else
 #ifdef __cplusplus
 extern "C"
 #endif
 _Noreturn void __assert_fail(const char *, const char *, unsigned, const char *) __NOEXCEPT;
-
 #define assert(e)  \
   ((e) ? (void)0 : __assert_fail(#e, __FILE__, __LINE__, __PRETTY_FUNCTION__))
 #endif