[lld] r288485 - Ignore R_X86_64_NONE.

[Rafael Espindola via llvm-commits]

Author: rafael
Date: Fri Dec  2 02:00:09 2016
New Revision: 288485

URL: http://llvm.org/viewvc/llvm-project?rev=288485&view=rev
Log:
Ignore R_X86_64_NONE.

It looks like the way dtrace works is

* The user creates .o files that reference magical symbol names.
* dtrace reads those files, collecs the info it needs and changes the
  relocation to R_X86_64_NONE expecting the linker to ignore them.

Added:
    lld/trunk/test/ELF/relocation-dtrace.test
Modified:
    lld/trunk/ELF/Target.cpp

Modified: lld/trunk/ELF/Target.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Target.cpp?rev=288485&r1=288484&r2=288485&view=diff
==============================================================================
--- lld/trunk/ELF/Target.cpp (original)
+++ lld/trunk/ELF/Target.cpp Fri Dec  2 02:00:09 2016
@@ -595,6 +595,8 @@ RelExpr X86_64TargetInfo<ELFT>::getRelEx
   case R_X86_64_REX_GOTPCRELX:
   case R_X86_64_GOTTPOFF:
     return R_GOT_PC;
+  case R_X86_64_NONE:
+    return R_HINT;
   }
 }
 

Added: lld/trunk/test/ELF/relocation-dtrace.test
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/relocation-dtrace.test?rev=288485&view=auto
==============================================================================
--- lld/trunk/test/ELF/relocation-dtrace.test (added)
+++ lld/trunk/test/ELF/relocation-dtrace.test Fri Dec  2 02:00:09 2016
@@ -0,0 +1,24 @@
+# RUN: yaml2obj %s -o %t.o
+# RUN: ld.lld -shared %t.o -o %t.so
+
+# Test that we can handle R_X86_64_NONE as produced by dtrace.
+
+!ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  OSABI:           ELFOSABI_FREEBSD
+  Type:            ET_REL
+  Machine:         EM_X86_64
+Sections:
+  - Name:            .text
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC ]
+  - Name:            .rela.text
+    Type:            SHT_RELA
+    Link:            .symtab
+    Info:            .text
+    Relocations:
+      - Offset:          0x0000000000000000
+        Symbol:          ''
+        Type:            R_X86_64_NONE