[PATCH] D44447: Treat libclang_rt.* as normal library if the user uses --sysroot=

[Tom Rix via Phabricator via cfe-commits]

trixirt created this revision.
trixirt added reviewers: rsmith, atanasyan, vkalintiris.
trixirt added a project: clang.
Herald added a subscriber: cfe-commits.

In cross compiling, one normally assumes that the user supplied sysroot contains all of the libraries needed in the link.  And so the linker adjusts the -L paths to look in the sysroot.
However because libclang_rt.* is supplied at link time as a full path, the link can not find it in the sysroot.

This change will churn the user's current experience and the unit tests.
I will take take of the tests, if folks are ok with the change.


Repository:
  rC Clang

https://reviews.llvm.org/D44447

Files:
  lib/Driver/ToolChain.cpp


Index: lib/Driver/ToolChain.cpp
===================================================================
--- lib/Driver/ToolChain.cpp
+++ lib/Driver/ToolChain.cpp
@@ -356,11 +356,17 @@
       TT.isWindowsMSVCEnvironment() || TT.isWindowsItaniumEnvironment();
 
   StringRef Arch = getArchNameForCompilerRTLib(*this, Args);
-  const char *Prefix = IsITANMSVCWindows ? "" : "lib";
-  const char *Suffix = Shared ? (Triple.isOSWindows() ? ".dll" : ".so")
+  const char *Prefix = "-l";
+  const char *Suffix = "";
+  SmallString<128> Path;
+
+  if (getDriver().SysRoot.empty()) {
+    Prefix = IsITANMSVCWindows ? "" : "lib";
+    Suffix = Shared ? (Triple.isOSWindows() ? ".dll" : ".so")
                               : (IsITANMSVCWindows ? ".lib" : ".a");
+    Path = getCompilerRTPath();
+  }
 
-  SmallString<128> Path(getCompilerRTPath());
   llvm::sys::path::append(Path, Prefix + Twine("clang_rt.") + Component + "-" +
                                     Arch + Env + Suffix);
   return Path.str();


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