[libc] Also remove _FORTIFY_SOURCE before including <stdlib.h> in overlay mode.

[lntue]

No description provided.

[llvmbot]

@llvm/pr-subscribers-libc

Author: None (lntue)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/142647.diff

1 Files Affected:

• (modified) libc/hdr/stdlib_overlay.h (+10)

diff --git a/libc/hdr/stdlib_overlay.h b/libc/hdr/stdlib_overlay.h
index f095cafe5e0bc..53c32ec0ae332 100644
--- a/libc/hdr/stdlib_overlay.h
+++ b/libc/hdr/stdlib_overlay.h
@@ -19,6 +19,11 @@
 // functions, causing external alias errors.  They are guarded by
 // `__USE_FORTIFY_LEVEL`, which will be temporarily disabled.
 
+#ifdef _FORTIFY_SOURCE
+#define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
+#undef _FORTIFY_SOURCE
+#endif
+
 #ifdef __USE_FORTIFY_LEVEL
 #define LIBC_OLD_USE_FORTIFY_LEVEL __USE_FORTIFY_LEVEL
 #undef __USE_FORTIFY_LEVEL
@@ -27,6 +32,11 @@
 
 #include <stdlib.h>
 
+#ifdef LIBC_OLD_FORTIFY_SOURCE
+#define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
+#undef LIBC_OLD_FORTIFY_SOURCE
+#endif
+
 #ifdef LIBC_OLD_USE_FORTIFY_LEVEL
 #undef __USE_FORTIFY_LEVEL
 #define __USE_FORTIFY_LEVEL LIBC_OLD_USE_FORTIFY_LEVEL