commit 786e866fea475d0d1b5bd51c59c653685b143970
author George Rimar <grimar@accesssoftek.com> Thu Mar 17 05:57:33 2016 +0000
committer George Rimar <grimar@accesssoftek.com> Thu Mar 17 05:57:33 2016 +0000
tree 49588c36d76ebc447f7c53f286ad35ef935a9635
parent 6f66f0a343256ce8a03890d9a80447592b748137

[ELF] - -pie/--pic-executable option implemented

-pie
--pic-executable

Create a position independent executable.  This is currently only
 supported on ELF platforms.  Position independent executables are
 similar to shared libraries in that they are relocated by the
 dynamic linker to the virtual address the OS chooses for them
 (which can vary between invocations).  Like normal dynamically
 linked executables they can be executed and symbols defined in the
 executable cannot be overridden by shared libraries.

Differential revision: http://reviews.llvm.org/D18183

llvm-svn: 263693

lld/ELF/Writer.cpp

diff --git a/lld/ELF/Writer.cpp b/lld/ELF/Writer.cpp
index a8b1f9b..377eed4 100644
--- a/lld/ELF/Writer.cpp
+++ b/lld/ELF/Writer.cpp
@@ -82,7 +82,7 @@
     return !Symtab.getSharedFiles().empty() && !Config->DynamicLinker.empty();
   }
   bool isOutputDynamic() const {
-    return !Symtab.getSharedFiles().empty() || Config->Shared;
+    return !Symtab.getSharedFiles().empty() || Config->Pic;
   }
 
   void ensureBss();
@@ -417,7 +417,7 @@
         continue;
       }
 
-      bool Dynrel = Config->Shared && !Target->isRelRelative(Type) &&
+      bool Dynrel = Config->Pic && !Target->isRelRelative(Type) &&
                     !Target->isSizeRel(Type);
       if (Preemptible || Dynrel) {
         uint32_t DynType;
@@ -466,8 +466,7 @@
     // We can however do better than just copying the incoming relocation. We
     // can process some of it and and just ask the dynamic linker to add the
     // load address.
-    if (!Config->Shared || Target->isRelRelative(Type) ||
-        Target->isSizeRel(Type))
+    if (!Config->Pic || Target->isRelRelative(Type) || Target->isSizeRel(Type))
       continue;
 
     uintX_t Addend = getAddend<ELFT>(RI);
@@ -1439,7 +1438,7 @@
 }
 
 static uint16_t getELFType() {
-  if (Config->Shared)
+  if (Config->Pic)
     return ET_DYN;
   if (Config->Relocatable)
     return ET_REL;