[flang-commits] [flang] [Flang] malloc(1) on AIX as malloc(0) returns nullptr (PR #73878)

[via flang-commits]

https://github.com/madanial0 updated https://github.com/llvm/llvm-project/pull/73878

>From 82a156eb115e0796688f835a47344c3f3d4648d0 Mon Sep 17 00:00:00 2001
From: Mark Danial <madanial at dixon.rtp.raleigh.ibm.com>
Date: Tue, 28 Nov 2023 22:14:54 -0500
Subject: [PATCH] [Flang] malloc(1) on AIX as malloc(0) returns nullptr

---
 flang/runtime/ISO_Fortran_binding.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/flang/runtime/ISO_Fortran_binding.cpp b/flang/runtime/ISO_Fortran_binding.cpp
index ce146844533a064..e2888464dc83207 100644
--- a/flang/runtime/ISO_Fortran_binding.cpp
+++ b/flang/runtime/ISO_Fortran_binding.cpp
@@ -75,7 +75,14 @@ RT_API_ATTRS int CFI_allocate(CFI_cdesc_t *descriptor,
     dim->sm = byteSize;
     byteSize *= extent;
   }
-  void *p{std::malloc(byteSize)};
+  #ifdef _AIX
+    if (!byteSize)
+      void *p{std::malloc(1)};
+    else
+      void *p{std::malloc(byteSize)};
+  #else
+    void *p{std::malloc(byteSize)};
+  #endif
   if (!p && byteSize) {
     return CFI_ERROR_MEM_ALLOCATION;
   }