[AArch64] Pass subtarget feature "+reserve-x18" instead of passing backend
option "-aarch64-reserve-x18".
This change is needed since backend options do not make it to the backend
when doing LTO and are not capable of changing the behavior of code-gen
passes on a per-function basis.
rdar://problem/21529937
Differential Revision: http://reviews.llvm.org/D11462
llvm-svn: 243185
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 46a309f..f99c818 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -919,11 +919,6 @@
else
CmdArgs.push_back("-aarch64-global-merge=true");
}
-
- if (Args.hasArg(options::OPT_ffixed_x18)) {
- CmdArgs.push_back("-backend-option");
- CmdArgs.push_back("-aarch64-reserve-x18");
- }
}
// Get CPU and ABI names. They are not independent
@@ -1971,6 +1966,9 @@
else
Features.push_back("-crc");
}
+
+ if (Args.hasArg(options::OPT_ffixed_x18))
+ Features.push_back("+reserve-x18");
}
static void getTargetFeatures(const Driver &D, const llvm::Triple &Triple,