[ELF] Fix --soname option.

Currently LLD accepts only "-soname <string>", but all the following
options are actually valid.

  --soname=foo
  --soname foo
  -soname=foo
  -soname foo
  -h foo

This patch fixes that issue.

llvm-svn: 205662

lld/lib/Driver/GnuLdOptions.td

@@ -145,9 +145,11 @@ def rpath_link : Separate<["-"], "rpath-link">,
 //===----------------------------------------------------------------------===//
 def grp_dynlib : OptionGroup<"opts">,
      HelpText<"DYNAMIC LIBRARY OPTIONS">;
-def soname : Separate<["-"], "soname">,
+def soname : Joined<["-", "--"], "soname=">,
      HelpText<"Set the internal DT_SONAME field to the specified name">,
      Group<grp_dynlib>;
+def soname_separate : Separate<["-", "--"], "soname">, Alias<soname>;
+def soname_h : Separate<["-"], "h">, Alias<soname>;
 
 //===----------------------------------------------------------------------===//
 /// Resolver Options

lld/unittests/DriverTests/GnuLdDriverTest.cpp

@@ -40,6 +40,26 @@ TEST_F(GnuLdParserTest, Empty) {
   EXPECT_EQ("No input files\n", errorMessage());
 }
 
+// --soname
+
+TEST_F(GnuLdParserTest, SOName) {
+  EXPECT_TRUE(parse("ld", "--start-group", "--end-group", "--soname=foo",
+                    nullptr));
+  EXPECT_EQ("foo", _context->sharedObjectName());
+}
+
+TEST_F(GnuLdParserTest, SONameSingleDash) {
+  EXPECT_TRUE(parse("ld", "--start-group", "--end-group", "-soname=foo",
+                    nullptr));
+  EXPECT_EQ("foo", _context->sharedObjectName());
+}
+
+TEST_F(GnuLdParserTest, SONameH) {
+  EXPECT_TRUE(parse("ld", "--start-group", "--end-group", "-h", "foo",
+                    nullptr));
+  EXPECT_EQ("foo", _context->sharedObjectName());
+}
+
 // Tests for --defsym
 
 TEST_F(GnuLdParserTest, DefsymDecimal) {