Subzero: Add the MIPS=1 makefile option for alternate testing mode.

Makefile.standalone

Index: Makefile.standalone
diff --git a/Makefile.standalone b/Makefile.standalone
index f3a5d877191cfce20594178941332d77d4d2a227..cb850cd41d45e5c636a2c5ba994d37d834c2233a 100644
--- a/Makefile.standalone
+++ b/Makefile.standalone
@@ -541,6 +541,20 @@ ifdef MINIMAL
 check-xtest check-xtest-lite: $(OBJDIR)/pnacl-sz make_symlink runtime
 	@echo "Crosstests disabled, minimal build"
 else
+ifdef MIPS
+check-xtest check-xtest-lite: $(OBJDIR)/pnacl-sz make_symlink runtime \
+  crosstest/test_arith_ll.ll
+       # Do all x8664/native/sse2 tests as a smoke test.
+       # Add in mips32 tests as they come online.
+	./pydir/crosstest_generator.py -v --lit \
+          --toolchain-root $(TOOLCHAIN_ROOT) \
+          $(FORCEASM_FLAG) \
+          $(FORCEASM_XTEST_EXCLUDES) \
+          -i x8664,native,sse2 \
+          -i mips32,xxx
+	PNACL_BIN_PATH=$(PNACL_BIN_PATH) \
+	$(LLVM_SRC_PATH)/utils/lit/lit.py -sv $(CHECK_XTEST_TESTS)
+else

[obucinac, 2016/09/01 16:31:20]

It appears

make -f Makefile.standalone check-xtest

runs all tests (does not exclude MIPS tests), command line is

./pydir/crosstest_generator.py -v --lit \
          --toolchain-root
/home/obucina/pnacl/nacl/native_client/toolchain/linux_x86 \
           \
           \
          -i x8632,native,sse2 \
          -i x8632,native,sse4.1,test_vector_ops \
          -i x8632,sandbox,sse4.1,Om1 \
          -i x8632,nonsfi,sse2,O2 \
          -i x8664,native,sse2 \
          -i x8664,native,sse4.1,test_vector_ops \
          -i x8664,sandbox,sse4.1,Om1 \
          -i arm32 \
          -i mips32 \
          -i mips32,native \
          -e arm32,sandbox,hwdiv-arm

On the other side

make -f Makefile.standalone check-xtest MIPS=1

runs as expected. Command line is

./pydir/crosstest_generator.py -v --lit \
          --toolchain-root
/home/obucina/pnacl/nacl/native_client/toolchain/linux_x86 \
           \
           \
          -i x8664,native,sse2 \
          -i mips32,xxx

 check-xtest: $(OBJDIR)/pnacl-sz make_symlink runtime \
   exists-nonsfi-x8632 exists-nonsfi-arm32 crosstest/test_arith_ll.ll
        # Do all native/sse2 tests, but only test_vector_ops for native/sse4.1.
@@ -588,6 +602,7 @@ check-xtest-lite: $(OBJDIR)/pnacl-sz make_symlink runtime \
 crosstest/test_arith_ll.ll: pydir/gen_test_arith_ll.py
 	python $< > $@
 endif
+endif
 
 check-unit: $(OBJDIR)/run_unittests
 	$(OBJDIR)/run_unittests
@@ -621,7 +636,12 @@ SPECRUN := --run
 	./pydir/szbuild_spec2k.py -v \
           $(SPECFLAGS) --target=$(TARGETFLAG) $(SPEC) $< $(SPECRUN)
 
+ifdef MIPS
+# Don't test spec2k on mips32, at least not yet.
+check-spec:
+else
 check-spec: exists-spec $(ALLSPEC:=.spec2k)
+endif
 
 check: check-lit check-unit check-xtest
 
@@ -664,6 +684,25 @@ exists-spec:
           exit 1 ; \
         fi
 
+ifdef MIPS
+check-presubmit presubmit: exists-sbtc
+# Make sure clang-format gets run.
+	+make -f Makefile.standalone format
+# Verify MINIMAL build, plus proper usage of REQUIRES in lit tests.
+	+make -f Makefile.standalone \
+          MINIMAL=1 check
+# Check that there are no g++ build errors or warnings.
+	+make -f Makefile.standalone \
+	  GPLUSPLUS=1 compile_only
+# Run lit tests, cross tests, and unit tests.
+	+make -f Makefile.standalone \
+          check
+# Check a sandboxed translator build.
+	+make -f Makefile.standalone \
+          DEBUG=1 sb
+# Provide validation of user awesomeness!
+	echo Success
+else
 check-presubmit presubmit: exists-nonsfi-x8632 exists-nonsfi-arm32 \
   exists-sbtc exists-spec
 # Make sure clang-format gets run.
@@ -713,6 +752,7 @@ check-presubmit presubmit: exists-nonsfi-x8632 exists-nonsfi-arm32 \
           TARGET=arm32 ALLSPEC='252.eon 254.gap 176.gcc 181.mcf' check-spec
 # Provide validation of user awesomeness!
 	echo Success
+endif
 
 presubmit-lite: exists-nonsfi-x8632 exists-nonsfi-arm32 \
   exists-sbtc exists-spec