r256967 - [WebAssembly] Add --gc-sections to the link line.

[Dan Gohman via cfe-commits]

Author: djg
Date: Wed Jan  6 13:43:32 2016
New Revision: 256967

URL: http://llvm.org/viewvc/llvm-project?rev=256967&view=rev
Log:
[WebAssembly] Add --gc-sections to the link line.

This will eventually be accompanied with a change to enable -ffunction-sections
and -fdata-sections by default, which is currently delayed by some development
process issues.

Modified:
    cfe/trunk/lib/Driver/Tools.cpp
    cfe/trunk/test/Driver/wasm-toolchain.c

Modified: cfe/trunk/lib/Driver/Tools.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Tools.cpp?rev=256967&r1=256966&r2=256967&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/Tools.cpp (original)
+++ cfe/trunk/lib/Driver/Tools.cpp Wed Jan  6 13:43:32 2016
@@ -6534,6 +6534,11 @@ void wasm::Linker::ConstructJob(Compilat
   ArgStringList CmdArgs;
   CmdArgs.push_back("-flavor");
   CmdArgs.push_back("ld");
+
+  // Enable garbage collection of unused input sections by default, since code
+  // size is of particular importance.
+  CmdArgs.push_back("--gc-sections");
+
   AddLinkerInputs(getToolChain(), Inputs, Args, CmdArgs);
   CmdArgs.push_back("-o");
   CmdArgs.push_back(Output.getFilename());

Modified: cfe/trunk/test/Driver/wasm-toolchain.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/wasm-toolchain.c?rev=256967&r1=256966&r2=256967&view=diff
==============================================================================
--- cfe/trunk/test/Driver/wasm-toolchain.c (original)
+++ cfe/trunk/test/Driver/wasm-toolchain.c Wed Jan  6 13:43:32 2016
@@ -1,3 +1,3 @@
 // RUN: %clang -### -no-canonical-prefixes -target wasm32-unknown-unknown -x assembler %s 2>&1 | FileCheck -check-prefix=AS_LINK %s
 // AS_LINK: clang{{.*}}" "-cc1as" {{.*}} "-o" "[[temp:[^"]*]]"
-// AS_LINK: lld{{.*}}" "-flavor" "ld" "[[temp]]" "-o" "a.out"
+// AS_LINK: lld{{.*}}" "-flavor" "ld" "--gc-sections" "[[temp]]" "-o" "a.out"