Add support for export_dynamic cmdline option and behaviour.

This option matches the behaviour of ld64, that is it prevents globals
from being dead stripped in executables and dylibs.

Reviewed by Lang Hames

Differential Revision: http://reviews.llvm.org/D16026

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@258554 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 25 insertions, 0 deletions

diff --git a/unittests/DriverTests/DarwinLdDriverTest.cpp b/unittests/DriverTests/DarwinLdDriverTest.cpp
index e2809c449..4b3bfe84f 100644
--- a/unittests/DriverTests/DarwinLdDriverTest.cpp
+++ b/unittests/DriverTests/DarwinLdDriverTest.cpp
@@ -84,9 +84,34 @@ TEST_F(DarwinLdParserTest, DeadStripRootsExe) {
 TEST_F(DarwinLdParserTest, DeadStripRootsDylib) {
   EXPECT_TRUE(parse("ld", "-arch", "x86_64", "-dylib", "-dead_strip", "foo.o",
                     nullptr));
+  EXPECT_FALSE(_ctx.globalsAreDeadStripRoots());
+}
+
+TEST_F(DarwinLdParserTest, DeadStripRootsRelocatable) {
+  EXPECT_TRUE(parse("ld", "-arch", "x86_64", "-r", "-dead_strip", "foo.o",
+                    nullptr));
+  EXPECT_FALSE(_ctx.globalsAreDeadStripRoots());
+}
+
+TEST_F(DarwinLdParserTest, DeadStripRootsExportDynamicExe) {
+  EXPECT_TRUE(parse("ld", "-arch", "x86_64", "-dead_strip",
+                    "-export_dynamic", "foo.o", nullptr));
   EXPECT_TRUE(_ctx.globalsAreDeadStripRoots());
 }
 
+TEST_F(DarwinLdParserTest, DeadStripRootsExportDynamicDylib) {
+  EXPECT_TRUE(parse("ld", "-arch", "x86_64", "-dylib", "-dead_strip",
+                    "-export_dynamic", "foo.o",
+                    nullptr));
+  EXPECT_TRUE(_ctx.globalsAreDeadStripRoots());
+}
+
+TEST_F(DarwinLdParserTest, DeadStripRootsExportDynamicRelocatable) {
+  EXPECT_TRUE(parse("ld", "-arch", "x86_64", "-r", "-dead_strip",
+                    "-export_dynamic", "foo.o", nullptr));
+  EXPECT_FALSE(_ctx.globalsAreDeadStripRoots());
+}
+
 TEST_F(DarwinLdParserTest, Arch) {
   EXPECT_TRUE(parse("ld", "-arch", "x86_64", "foo.o", nullptr));
   EXPECT_EQ(MachOLinkingContext::arch_x86_64, _ctx.arch());