[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, 9 insertions, 0 deletions

diff --git a/lld/ELF/DriverUtils.cpp b/lld/ELF/DriverUtils.cpp
index ca13b309c4a..901760c439a 100644
--- a/lld/ELF/DriverUtils.cpp
+++ b/lld/ELF/DriverUtils.cpp
@@ -207,3 +207,12 @@ Optional<std::string> elf::searchLibrary(StringRef Name) {
   }
   return None;
 }
+
+// If a linker script doesn't exist in the current directory, we also look for
+// the script in the '-L' search paths. This matches the behaviour of both '-T'
+// and linker script INPUT() directives in ld.bfd.
+Optional<std::string> elf::searchLinkerScript(StringRef Name) {
+  if (fs::exists(Name))
+    return Name.str();
+  return findFromSearchPaths(Name);
+}