[lld] r268926 - Allow user defined __init_aray_start.

[Rafael Espindola via llvm-commits]

Author: rafael
Date: Mon May  9 10:25:54 2016
New Revision: 268926

URL: http://llvm.org/viewvc/llvm-project?rev=268926&view=rev
Log:
Allow user defined __init_aray_start.

Fixes pr27683.

Added:
    lld/trunk/test/ELF/user_def_init_array_start.s
Modified:
    lld/trunk/ELF/Writer.cpp

Modified: lld/trunk/ELF/Writer.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Writer.cpp?rev=268926&r1=268925&r2=268926&view=diff
==============================================================================
--- lld/trunk/ELF/Writer.cpp (original)
+++ lld/trunk/ELF/Writer.cpp Mon May  9 10:25:54 2016
@@ -1104,8 +1104,11 @@ template <class ELFT>
 static Symbol *addOptionalSynthetic(SymbolTable<ELFT> &Table, StringRef Name,
                                     OutputSectionBase<ELFT> *Sec,
                                     typename ELFT::uint Val) {
-  if (!Table.find(Name))
+  SymbolBody *S = Table.find(Name);
+  if (!S)
     return nullptr;
+  if (!S->isUndefined() && !S->isShared())
+    return S->symbol();
   return Table.addSynthetic(Name, Sec, Val);
 }
 

Added: lld/trunk/test/ELF/user_def_init_array_start.s
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/user_def_init_array_start.s?rev=268926&view=auto
==============================================================================
--- lld/trunk/test/ELF/user_def_init_array_start.s (added)
+++ lld/trunk/test/ELF/user_def_init_array_start.s Mon May  9 10:25:54 2016
@@ -0,0 +1,10 @@
+// RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
+// RUN: ld.lld %t.o -o %t2.so -shared
+// Allow user defined __init_array_start. This is used by musl because of the
+// the bfd linker not handling these properly. We always create them as
+// hidden, musl should not have problems with lld.
+
+        .hidden __init_array_start
+        .globl  __init_array_start
+__init_array_start:
+        .zero   8