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/include/clang/Basic/DiagnosticCommonKinds.td b/clang/include/clang/Basic/DiagnosticCommonKinds.td
index f40eea6..0b7f987 100644
--- a/clang/include/clang/Basic/DiagnosticCommonKinds.td
+++ b/clang/include/clang/Basic/DiagnosticCommonKinds.td
@@ -123,6 +123,8 @@
def err_target_unknown_fpmath : Error<"unknown FP unit '%0'">;
def err_target_unsupported_fpmath : Error<
"the '%0' unit is not supported with this instruction set">;
+def err_target_unsupported_unaligned : Error<
+ "the %0 sub-architecture does not support unaligned accesses">;
// Source manager
def err_cannot_open_file : Error<"cannot open file '%0': %1">, DefaultFatal;
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");
+ }
}
}