[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
diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
index fa12154..eff2e8d 100644
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -144,6 +144,9 @@
if (Config->EMachine == EM_AMDGPU && !Config->Entry.empty())
error("-e option is not valid for AMDGPU.");
+ if (Config->Pie && Config->Shared)
+ error("-shared and -pie may not be used together");
+
if (!Config->Relocatable)
return;
@@ -153,6 +156,8 @@
error("-r and --gc-sections may not be used together");
if (Config->ICF)
error("-r and --icf may not be used together");
+ if (Config->Pie)
+ error("-r and -pie may not be used together");
}
static StringRef
@@ -238,6 +243,7 @@
Config->ICF = Args.hasArg(OPT_icf);
Config->NoUndefined = Args.hasArg(OPT_no_undefined);
Config->NoinhibitExec = Args.hasArg(OPT_noinhibit_exec);
+ Config->Pie = Args.hasArg(OPT_pie);
Config->PrintGcSections = Args.hasArg(OPT_print_gc_sections);
Config->Relocatable = Args.hasArg(OPT_relocatable);
Config->SaveTemps = Args.hasArg(OPT_save_temps);
@@ -261,6 +267,8 @@
Config->ZOrigin = hasZOption(Args, "origin");
Config->ZRelro = !hasZOption(Args, "norelro");
+ Config->Pic = Config->Pie || Config->Shared;
+
if (Config->Relocatable)
Config->StripAll = false;