Emit diagnostic for -munaligned-access on v6m targets
Rather than silently disabling unaligned accesses for v6m targets as
in the previous patch to llvm, instead produce a warning saying that
this architecture doesn't support unaligned accesses.
Patch by Ben Foster
llvm-svn: 215531
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 2a817f7..21ffce2 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -806,8 +806,12 @@
CmdArgs.push_back("-backend-option");
if (A->getOption().matches(options::OPT_mno_unaligned_access))
CmdArgs.push_back("-arm-strict-align");
- else
+ else {
+ if (getToolChain().getTriple().getSubArch() ==
+ llvm::Triple::SubArchType::ARMSubArch_v6m)
+ D.Diag(diag::err_target_unsupported_unaligned) << "v6m";
CmdArgs.push_back("-arm-no-strict-align");
+ }
}
}