[release-branch.go1.12] cmd/go: accept -Wl,-R/path/

This is a backport of CL 178397.

Updates #32167
Fixes #32168

Change-Id: Idb16a01d56814ea09ad277798787355dc6a3121f
Reviewed-on: https://go-review.googlesource.com/c/go/+/181437
Reviewed-by: Jason Donenfeld <Jason@zx2c4.com>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Jason Donenfeld <Jason@zx2c4.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/go/internal/work/security.go

@@ -177,6 +177,8 @@ var validLinkerFlags = []*regexp.Regexp{
 	re(`-Wl,-framework,[^,@\-][^,]+`),
 	re(`-Wl,-headerpad_max_install_names`),
 	re(`-Wl,--no-undefined`),
+	re(`-Wl,-R([^@\-][^,@]*$)`),
+	re(`-Wl,--just-symbols[=,]([^,@\-][^,@]+)`),
 	re(`-Wl,-rpath(-link)?[=,]([^,@\-][^,]+)`),
 	re(`-Wl,-s`),
 	re(`-Wl,-search_paths_first`),
@@ -206,6 +208,8 @@ var validLinkerFlagsWithNextArg = []string{
 	"-target",
 	"-Wl,-framework",
 	"-Wl,-rpath",
+	"-Wl,-R",
+	"-Wl,--just-symbols",
 	"-Wl,-undefined",
 }
 

src/cmd/go/internal/work/security_test.go

@@ -125,6 +125,11 @@ var goodLinkerFlags = [][]string{
 	{"-pthread"},
 	{"-Wl,-rpath,foo"},
 	{"-Wl,-rpath,$ORIGIN/foo"},
+	{"-Wl,-R", "/foo"},
+	{"-Wl,-R", "foo"},
+	{"-Wl,-R,foo"},
+	{"-Wl,--just-symbols=foo"},
+	{"-Wl,--just-symbols,foo"},
 	{"-Wl,--warn-error"},
 	{"-Wl,--no-warn-error"},
 	{"foo.so"},
@@ -197,6 +202,9 @@ var badLinkerFlags = [][]string{
 	{"-x", "--c"},
 	{"-x", "@obj"},
 	{"-Wl,-rpath,@foo"},
+	{"-Wl,-R,foo,bar"},
+	{"-Wl,-R,@foo"},
+	{"-Wl,--just-symbols,@foo"},
 	{"../x.o"},
 }