Add option to force filetype=asm for testing

Makefile.standalone

Index: Makefile.standalone
diff --git a/Makefile.standalone b/Makefile.standalone
index 6c976e4f4b56c6eeaccffede1bdc760b73120bff..4c562408788280b7eea125f47293576625f81925 100644
--- a/Makefile.standalone
+++ b/Makefile.standalone
@@ -138,6 +138,16 @@ ifdef MSAN
   LD_EXTRA += -fsanitize=memory
 endif
 
+ifdef FORCEASM
+  FORCEASM_FLAG = --filetype=asm
+  FORCEASM_XTEST_EXCLUDES = -e x8632,sandbox,test_sync_atomic

[Jim Stichnoth, 2015/12/20 18:42:23]

Explain this, e.g.:

# With --filetype=asm and --sandbox, the llvm-mc assembler emits the lock and
16-bit prefixes in the "wrong" order, causing the validator to reject the
resulting nexe.  So we just disable those tests for now.

[sehr, 2016/01/07 18:53:11]

Done.

+  FORCEASM_LIT_PARAM = --param=FORCEASM
+else
+  FORCEASM_FLAG =
+  FORCEASM_XTEST_EXCLUDES =
+  FORCEASM_LIT_PARAM =
+endif
+
 SB_OBJDIR := $(OBJDIR)+Sandboxed
 
 $(info -----------------------------------------------)
@@ -384,7 +394,7 @@ runtime.is.built: $(RT_SRC) pydir/build-runtime.py
 
 check-lit: $(OBJDIR)/pnacl-sz make_symlink
 	PNACL_BIN_PATH=$(PNACL_BIN_PATH) \
-	$(LLVM_SRC_PATH)/utils/lit/lit.py -sv tests_lit
+	$(LLVM_SRC_PATH)/utils/lit/lit.py -sv tests_lit $(FORCEASM_LIT_PARAM)
 
 ifdef MINIMAL
 check-xtest: $(OBJDIR)/pnacl-sz make_symlink runtime
@@ -397,6 +407,8 @@ check-xtest: $(OBJDIR)/pnacl-sz make_symlink runtime
        # TODO(jpp): reenable the x86-64 tests.
 	./pydir/crosstest_generator.py -v --lit \
           --toolchain-root $(TOOLCHAIN_ROOT) \
+          $(FORCEASM_FLAG) \
+          $(FORCEASM_XTEST_EXCLUDES) \
           -i x8632,native,sse2 \
           -i x8632,native,sse4.1,test_vector_ops \
           -i x8632,sandbox,sse4.1,Om1 \
@@ -464,6 +476,9 @@ check-presubmit presubmit:
 # Run spec2k for x86-32 without advanced phi lowering.
 	+make -f Makefile.standalone \
           SPECFLAGS='--sz=--phi-edge-split=0' check-spec
+# Run cross tests to check for regressions in filetype=asm

[Jim Stichnoth, 2015/12/20 18:42:23]

How about more positive phrasing:
  Run cross tests to validate filetype=asm output

:)

[sehr, 2016/01/07 18:53:11]

Done.

+	+make -f Makefile.standalone \
+          check-xtest FORCEASM=1
 # Build spec2k for arm32.
 	+make -f Makefile.standalone \
           TARGET=arm32 SPECBUILDONLY=true check-spec