[lld] r335090 - [ELF] Support -z initfirst

[Fangrui Song via llvm-commits]

Author: maskray
Date: Tue Jun 19 19:06:01 2018
New Revision: 335090

URL: http://llvm.org/viewvc/llvm-project?rev=335090&view=rev
Log:
[ELF] Support -z initfirst

Summary:
glibc uses this option to link libpthread.so

glibc/nptl/Makefile:
LDFLAGS-pthread.so = -Wl,--enable-new-dtags,-z,nodelete,-z,initfirst

Reviewers: ruiu, echristo, espindola

Subscribers: emaste, arichardson, llvm-commits

Differential Revision: https://reviews.llvm.org/D48329

Modified:
    lld/trunk/ELF/Config.h
    lld/trunk/ELF/Driver.cpp
    lld/trunk/ELF/SyntheticSections.cpp
    lld/trunk/test/ELF/dt_flags.s

Modified: lld/trunk/ELF/Config.h
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Config.h?rev=335090&r1=335089&r2=335090&view=diff
==============================================================================
--- lld/trunk/ELF/Config.h (original)
+++ lld/trunk/ELF/Config.h Tue Jun 19 19:06:01 2018
@@ -172,6 +172,7 @@ struct Configuration {
   bool ZCopyreloc;
   bool ZExecstack;
   bool ZHazardplt;
+  bool ZInitfirst;
   bool ZKeepTextSectionPrefix;
   bool ZNodelete;
   bool ZNodlopen;

Modified: lld/trunk/ELF/Driver.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Driver.cpp?rev=335090&r1=335089&r2=335090&view=diff
==============================================================================
--- lld/trunk/ELF/Driver.cpp (original)
+++ lld/trunk/ELF/Driver.cpp Tue Jun 19 19:06:01 2018
@@ -784,6 +784,7 @@ void LinkerDriver::readConfigs(opt::Inpu
   Config->ZCopyreloc = getZFlag(Args, "copyreloc", "nocopyreloc", true);
   Config->ZExecstack = getZFlag(Args, "execstack", "noexecstack", false);
   Config->ZHazardplt = hasZOption(Args, "hazardplt");
+  Config->ZInitfirst = hasZOption(Args, "initfirst");
   Config->ZKeepTextSectionPrefix = getZFlag(
       Args, "keep-text-section-prefix", "nokeep-text-section-prefix", false);
   Config->ZNodelete = hasZOption(Args, "nodelete");

Modified: lld/trunk/ELF/SyntheticSections.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/SyntheticSections.cpp?rev=335090&r1=335089&r2=335090&view=diff
==============================================================================
--- lld/trunk/ELF/SyntheticSections.cpp (original)
+++ lld/trunk/ELF/SyntheticSections.cpp Tue Jun 19 19:06:01 2018
@@ -1239,6 +1239,8 @@ template <class ELFT> void DynamicSectio
   uint32_t DtFlags1 = 0;
   if (Config->Bsymbolic)
     DtFlags |= DF_SYMBOLIC;
+  if (Config->ZInitfirst)
+    DtFlags1 |= DF_1_INITFIRST;
   if (Config->ZNodelete)
     DtFlags1 |= DF_1_NODELETE;
   if (Config->ZNodlopen)

Modified: lld/trunk/test/ELF/dt_flags.s
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/dt_flags.s?rev=335090&r1=335089&r2=335090&view=diff
==============================================================================
--- lld/trunk/test/ELF/dt_flags.s (original)
+++ lld/trunk/test/ELF/dt_flags.s Tue Jun 19 19:06:01 2018
@@ -3,7 +3,7 @@
 # RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
 # RUN: ld.lld -shared %t -o %t.so
 
-# RUN: ld.lld -z now -z nodelete -z nodlopen -z origin -Bsymbolic %t %t.so -o %t1
+# RUN: ld.lld -z initfirst -z now -z nodelete -z nodlopen -z origin -Bsymbolic %t %t.so -o %t1
 # RUN: llvm-readobj -dynamic-table %t1 | FileCheck -check-prefix=FLAGS %s
 
 # RUN: ld.lld %t %t.so -o %t2
@@ -14,12 +14,12 @@
 
 # FLAGS: DynamicSection [
 # FLAGS:   0x000000000000001E FLAGS ORIGIN SYMBOLIC BIND_NOW
-# FLAGS:   0x000000006FFFFFFB FLAGS_1 NOW NODELETE NOOPEN ORIGIN
+# FLAGS:   0x000000006FFFFFFB FLAGS_1 NOW NODELETE INITFIRST NOOPEN ORIGIN
 # FLAGS: ]
 
 # CHECK: DynamicSection [
-# CHECK-NOT:   0x000000000000001E FLAGS ORIGIN SYMBOLIC BIND_NOW
-# CHECK-NOT:   0x000000006FFFFFFB FLAGS_1 NOW NODELETE NOOPEN ORIGIN
+# CHECK-NOT:   FLAGS
+# CHECK-NOT:   FLAGS_1
 # CHECK: ]
 
 .globl _start