Build fewer tests in Travis platform_dependent tests

Summary:
platform_dependent tests in Travis now builds all tests, which is not needed. Only build those tests we need to run.
Closes https://github.com/facebook/rocksdb/pull/2647

Differential Revision: D5513954

Pulled By: siying

fbshipit-source-id: 4d540b146124e70dd25586c47939d19f93655b0a

.travis.yml

@@ -57,7 +57,7 @@ before_script:
 
 script:
   - ${CXX} --version
-  - if [ "${TEST_GROUP}" == 'platform_dependent' ]; then ccache -C && OPT=-DTRAVIS V=1 make -j4 all && OPT=-DTRAVIS V=1 ROCKSDBTESTS_END=db_block_cache_test make -j4 check_some; fi
+  - if [ "${TEST_GROUP}" == 'platform_dependent' ]; then ccache -C && OPT=-DTRAVIS V=1 ROCKSDBTESTS_END=db_block_cache_test make -j4 all_but_some_tests check_some; fi
   - if [ "${TEST_GROUP}" == '1' ]; then OPT=-DTRAVIS V=1 ROCKSDBTESTS_START=db_block_cache_test ROCKSDBTESTS_END=comparator_db_test make -j4 check_some; fi
   - if [ "${TEST_GROUP}" == '2' ]; then OPT=-DTRAVIS V=1 ROCKSDBTESTS_START=comparator_db_test make -j4 check_some; fi
   - if [ "${JOB_NAME}" == 'java_test' ]; then OPT=-DTRAVIS V=1 make clean jclean && make rocksdbjava jtest; fi

Makefile

@@ -575,6 +575,8 @@ endif  # PLATFORM_SHARED_EXT
 
 all: $(LIBRARY) $(BENCHMARKS) tools tools_lib test_libs $(TESTS)
 
+all_but_some_tests: $(LIBRARY) $(BENCHMARKS) tools tools_lib test_libs $(SUBSET)
+
 static_lib: $(LIBRARY)
 
 shared_lib: $(SHARED)

db/db_basic_test.cc

@@ -175,6 +175,8 @@ TEST_F(DBBasicTest, LevelLimitReopen) {
   int i = 0;
   while (NumTableFilesAtLevel(2, 1) == 0) {
     ASSERT_OK(Put(1, Key(i++), value));
+    dbfull()->TEST_WaitForFlushMemTable();
+    dbfull()->TEST_WaitForCompact();
   }
 
   options.num_levels = 1;