[ELF] Fall back to search dirs for linker scripts specified with -T

Summary:
This matches the behaviour of ld.bfd:
https://sourceware.org/binutils/docs/ld/Options.html#Options

If scriptfile does not exist in the current directory, ld looks for it in
the directories specified by any preceding '-L' options. Multiple '-T'
options accumulate.

Reviewers: ruiu, grimar

Reviewed By: ruiu, grimar

Subscribers: emaste, llvm-commits

Differential Revision: https://reviews.llvm.org/D40129

llvm-svn: 318655

1 files changed, 6 insertions, 2 deletions

diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
index a2e4559bab3..e8d3639483b 100644
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -862,8 +862,12 @@ void LinkerDriver::createFiles(opt::InputArgList &Args) {
       addFile(Arg->getValue(), /*WithLOption=*/false);
       break;
     case OPT_script:
-      if (Optional<MemoryBufferRef> MB = readFile(Arg->getValue()))
-        readLinkerScript(*MB);
+      if (Optional<std::string> Path = searchLinkerScript(Arg->getValue())) {
+        if (Optional<MemoryBufferRef> MB = readFile(*Path))
+          readLinkerScript(*MB);
+        break;
+      }
+      error(Twine("cannot find linker script ") + Arg->getValue());
       break;
     case OPT_as_needed:
       Config->AsNeeded = true;