[ELF] Implement parsing `-l` prefixed items in the `GROUP` linker script command.

There are two forms of `-l` prefixed expression:

* -l<libname>
* -l:<filename>

In the first case a linker should construct a full library name
`lib + libname + .[so|a]` and search this library as usual. In the second case
a linker should use the `<filename>` as is and search this file through library
search directories.

The patch reviewed by Shankar Easwaran.

llvm-svn: 213077

1 files changed, 7 insertions, 3 deletions

diff --git a/lld/include/lld/ReaderWriter/LinkerScript.h b/lld/include/lld/ReaderWriter/LinkerScript.h
index 7d52f596fd5..ede0e350b92 100644
--- a/lld/include/lld/ReaderWriter/LinkerScript.h
+++ b/lld/include/lld/ReaderWriter/LinkerScript.h
@@ -34,6 +34,7 @@ public:
     unknown,
     eof,
     identifier,
+    libname,
     comma,
     l_paren,
     r_paren,
@@ -145,10 +146,11 @@ private:
 struct Path {
   StringRef _path;
   bool _asNeeded;
+  bool _isDashlPrefix;
 
-  Path() : _asNeeded(false) {}
-  explicit Path(StringRef path, bool asNeeded = false)
-      : _path(path), _asNeeded(asNeeded) {}
+  Path() : _asNeeded(false), _isDashlPrefix(false) {}
+  explicit Path(StringRef path, bool asNeeded = false, bool isLib = false)
+      : _path(path), _asNeeded(asNeeded), _isDashlPrefix(isLib) {}
 };
 
 class Group : public Command {
@@ -169,6 +171,8 @@ public:
       first = false;
       if (path._asNeeded)
         os << "AS_NEEDED(";
+      if (path._isDashlPrefix)
+        os << "-l";
       os << path._path;
       if (path._asNeeded)
         os << ")";