r314177 - [XRay][Driver] Do not link in XRay runtime in shared libs

[Dean Michael Berris via cfe-commits]

Author: dberris
Date: Mon Sep 25 16:40:33 2017
New Revision: 314177

URL: http://llvm.org/viewvc/llvm-project?rev=314177&view=rev
Log:
[XRay][Driver] Do not link in XRay runtime in shared libs

Summary:
This change ensures that we don't link in the XRay runtime when building
shared libraries with clang. This doesn't prevent us from building
shared libraris tht have XRay instrumentation sleds, but it does prevent
us from linking in the static XRay runtime into a shared library.

The XRay runtime currently doesn't support dynamic registration of
instrumentation sleds in shared objects, which we'll start enabling in
the future. That work has to happen in the back-end and in the runtime.

Reviewers: rnk, pelikan

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D38226

Added:
    cfe/trunk/test/Driver/XRay/xray-shared-noxray.cpp
Modified:
    cfe/trunk/lib/Driver/ToolChains/Gnu.cpp

Modified: cfe/trunk/lib/Driver/ToolChains/Gnu.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/ToolChains/Gnu.cpp?rev=314177&r1=314176&r2=314177&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/ToolChains/Gnu.cpp (original)
+++ cfe/trunk/lib/Driver/ToolChains/Gnu.cpp Mon Sep 25 16:40:33 2017
@@ -206,6 +206,10 @@ void tools::gcc::Linker::RenderExtraTool
 
 static bool addXRayRuntime(const ToolChain &TC, const ArgList &Args,
                            ArgStringList &CmdArgs) {
+  // Do not add the XRay runtime to shared libraries.
+  if (Args.hasArg(options::OPT_shared))
+    return false;
+
   if (Args.hasFlag(options::OPT_fxray_instrument,
                    options::OPT_fnoxray_instrument, false)) {
     CmdArgs.push_back("-whole-archive");
@@ -213,6 +217,7 @@ static bool addXRayRuntime(const ToolCha
     CmdArgs.push_back("-no-whole-archive");
     return true;
   }
+
   return false;
 }
 

Added: cfe/trunk/test/Driver/XRay/xray-shared-noxray.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/XRay/xray-shared-noxray.cpp?rev=314177&view=auto
==============================================================================
--- cfe/trunk/test/Driver/XRay/xray-shared-noxray.cpp (added)
+++ cfe/trunk/test/Driver/XRay/xray-shared-noxray.cpp Mon Sep 25 16:40:33 2017
@@ -0,0 +1,14 @@
+// RUN: %clangxx -shared -fPIC -o /dev/null -v -fxray-instrument %s 2>&1 | \
+// RUN:     FileCheck %s --check-prefix=SHARED
+// RUN: %clangxx -static -o /dev/null -v -fxray-instrument %s 2>&1 -DMAIN | \
+// RUN:     FileCheck %s --check-prefix=STATIC
+// RUN: %clangxx -static -fPIE -o /dev/null -v -fxray-instrument %s 2>&1 \
+// RUN:     -DMAIN | FileCheck %s --check-prefix=STATIC
+//
+// SHARED-NOT: {{clang_rt\.xray-}}
+// STATIC: {{clang_rt\.xray-}}
+int foo() { return 42; }
+
+#ifdef MAIN
+int main() { return foo(); }
+#endif