[PATCH] D74631: [clang][XCOFF] Indicate that XCOFF does not support COMDATs

[David Tenty via Phabricator via cfe-commits]

daltenty updated this revision to Diff 245201.
daltenty added a comment.
Herald added subscribers: aheejin, dschuff.

- Update lang doc to indicate XCOFF doesn't support COMDAT


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D74631/new/

https://reviews.llvm.org/D74631

Files:
  clang/test/CodeGen/xcoff-comdat.cpp
  llvm/docs/LangRef.rst
  llvm/include/llvm/ADT/Triple.h


Index: llvm/include/llvm/ADT/Triple.h
===================================================================
--- llvm/include/llvm/ADT/Triple.h
+++ llvm/include/llvm/ADT/Triple.h
@@ -743,7 +743,7 @@
 
   /// Tests whether the target supports comdat
   bool supportsCOMDAT() const {
-    return !isOSBinFormatMachO();
+    return !(isOSBinFormatMachO() || isOSBinFormatXCOFF());
   }
 
   /// Tests whether the target uses emulated TLS as default.
Index: llvm/docs/LangRef.rst
===================================================================
--- llvm/docs/LangRef.rst
+++ llvm/docs/LangRef.rst
@@ -910,8 +910,8 @@
     The linker may choose any COMDAT key but the sections must contain the
     same amount of data.
 
-Note that the Mach-O platform doesn't support COMDATs, and ELF and WebAssembly
-only support ``any`` as a selection kind.
+Note that XCOFF and the Mach-O platform don't support COMDATs, and ELF and
+WebAssembly only support ``any`` as a selection kind.
 
 Here is an example of a COMDAT group where a function will only be selected if
 the COMDAT key's section is the largest:
Index: clang/test/CodeGen/xcoff-comdat.cpp
===================================================================
--- /dev/null
+++ clang/test/CodeGen/xcoff-comdat.cpp
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -triple powerpc-ibm-aix -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple powerpc64-ibm-aix -emit-llvm -o - %s | FileCheck %s
+
+class a {
+  virtual void d() {}
+  virtual void e();
+};
+void a::e() {}
+
+// CHECK-NOT: = comdat


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