Subzero: Add a "make check-presubmit" target.

Makefile.standalone

 # The following variables will likely need to be modified, depending on where
 # and how you built LLVM & Clang. They can be overridden in a command-line
 # invocation of make, like:
 #
 #   make LLVM_SRC_PATH=<path> LIBCXX_INSTALL_PATH=<path> CLANG_PATH=<path> \
 #        PNACL_BIN_PATH=<path> ...
 #
 
 # LLVM_SRC_PATH is the path to the root of the checked out source code. This
 # directory should contain the configure script, the include/ and lib/
@@ skipping 399 matching lines @@
 ifeq ($(TARGET),x8632)
   TARGETFLAG=x8632
   SETUP=SetupGccX8632Opt
   SPEC := -O2 --filetype=obj
 endif
 ifeq ($(TARGET),arm32)
   TARGETFLAG=arm32
   SETUP=SetupGccArmOpt
   SPEC := -O2 --filetype=asm
 endif
-
+SPECFLAGS :=
+SPECBUILDONLY := false
 %.spec2k: % $(OBJDIR)/pnacl-sz make_symlink runtime
-        ./pydir/szbuild_spec2k.py -v --force --target=$(TARGETFLAG) $(SPEC) $<
-        ( cd ../../../tests/spec2k; \
+        ./pydir/szbuild_spec2k.py -v --force \
+          $(SPECFLAGS) --target=$(TARGETFLAG) $(SPEC) $<
+        $(SPECBUILDONLY) || ( cd ../../../tests/spec2k; \
          ./run_all.sh RunTimedBenchmarks $(SETUP) train $< )
 
 check-spec: $(ALLSPEC:=.spec2k)
 
 check: check-lit check-unit check-xtest
 
+NPROCS := $(shell grep processor /proc/cpuinfo | wc -l)
+
+check-presubmit:
+        +make -f Makefile.standalone format
+        git diff --quiet
+        +make -f Makefile.standalone \
+          MINIMAL=1 check
+        +make -f Makefile.standalone \
+          DEBUG=1 CHECK_X86_ASM=1 check-unit
+        +make -f Makefile.standalone \
+          check check-spec
+        +make -f Makefile.standalone \
+          SPECFLAGS='-Om1' SPECBUILDONLY=true check-spec
+        +make -f Makefile.standalone \
+          SPECFLAGS='--sz=--phi-edge-split=0' check-spec
+        +make -f Makefile.standalone \
+          TARGET=arm32 SPECBUILDONLY=true check-spec
+        +make -f Makefile.standalone \
+          TARGET=arm32 SPECFLAGS='-Om1' SPECBUILDONLY=true check-spec
+        +make -f Makefile.standalone \
+          TARGET=arm32 ALLSPEC='176.gcc 181.mcf 254.gap' check-spec
+        echo Success
+
 FORMAT_BLACKLIST =
 # Add one of the following lines for each source file to ignore.
 FORMAT_BLACKLIST += ! -name IceParseInstsTest.cpp
 FORMAT_BLACKLIST += ! -name IceParseTypesTest.cpp
 FORMAT_BLACKLIST += ! -name assembler_arm.h
 FORMAT_BLACKLIST += ! -name assembler_arm.cc
 format:
         $(CLANG_FORMAT_PATH)/clang-format -style=LLVM -i \
           `find . -regex '.*\.\(c\|h\|cpp\)' $(FORMAT_BLACKLIST)`
 
@@ skipping 10 matching lines @@
 
 docs:
         doxygen Doxyfile
         @echo See file://`pwd`/docs/html/index.html
 
 clean:
         rm -rf pnacl-sz *.o $(OBJDIR) $(SB_OBJDIR) build/pnacl-sz.bloat.json
 
 clean-all: clean
         rm -rf build/ docs/