[ELF] Add -z muldefs option.

This adds -z muldefs option which is widely used over
--allow-multiple-definition.

This option is supported by the GNU linker.

llvm-svn: 205391

2 files changed, 17 insertions, 4 deletions

diff --git a/lld/lib/Driver/GnuLdDriver.cpp b/lld/lib/Driver/GnuLdDriver.cpp
index 47312533837..9d380e83d66 100644
--- a/lld/lib/Driver/GnuLdDriver.cpp
+++ b/lld/lib/Driver/GnuLdDriver.cpp
@@ -440,6 +440,16 @@ bool GnuLdDriver::parse(int argc, const char *argv[],
       groupStack.pop();
       break;
 
+    case OPT_z: {
+      StringRef extOpt = inputArg->getValue();
+      if (extOpt == "muldefs")
+        ctx->setAllowDuplicates(true);
+      else
+        diagnostics << "warning: ignoring unknown argument for -z: " << extOpt
+                    << "\n";
+      break;
+    }
+
     case OPT_INPUT:
     case OPT_l: {
       bool isDashlPrefix = (inputArg->getOption().getID() == OPT_l);
diff --git a/lld/test/elf/allowduplicates.objtxt b/lld/test/elf/allowduplicates.objtxt
index bb0d485b6bb..dbad3bd312e 100644
--- a/lld/test/elf/allowduplicates.objtxt
+++ b/lld/test/elf/allowduplicates.objtxt
@@ -1,8 +1,11 @@
-# RUN: lld -flavor gnu -target x86_64 --allow-multiple-definition -r %s \
-# RUN:     --output-filetype=yaml | FileCheck %s
+# RUN: lld -flavor gnu -target x86_64 --allow-multiple-definition %s \
+# RUN:     --output-filetype=yaml --noinhibit-exec | FileCheck %s
 #
-# RUN: not lld -flavor gnu -target x86_64 -r %s --output-filetype=yaml 2>&1 \
-# RUN:   | FileCheck -check-prefix=ERROR %s
+# RUN: not lld -flavor gnu -target x86_64 %s --output-filetype=yaml \
+# RUN: --noinhibit-exec 2>&1 | FileCheck -check-prefix=ERROR %s
+#
+# RUN: lld -flavor gnu -target x86_64 -z muldefs %s \
+# RUN: --noinhibit-exec --output-filetype=yaml | FileCheck %s
 
 ---
 defined-atoms: