[test-suite] Add some cross-compile options.

[mcrosier]

Summary

The value of variable TEST_SUITE_EXE_WRAPPER, if present, is passed to
RunSafely.sh 's -u parameter, to wrap the test execution within. This is
mainly intended to be used while cross-compiling to run under an
emulator.

(I'm submitting this on behalf of a fellow engineer, so please be kind to the messenger :)

Chad

[MatzeB]

The timeit/fpcmp thing seems to have the same goal as http://reviews.llvm.org/D15004 and should probably be discussed separately.

Passing -u along makes sense, though I'd prefer to call it TEST_SUITE_RUN_UNDER simply because the concept is already called RUN_UNDER in RunSafely and the makefiles and I'd like to avoid introducing a 2nd name for the concept.

[mcrosier]

Address Matthias' comments. Specifically,
-Drop the timeit/fpcmp stuff in favor of http://reviews.llvm.org/D15004.
-Use the preferred name TEST_SUITE_RUN_UNDER.

[MatzeB]

LGTM

[mcrosier]

Committed in r254765.

CMakeLists.txt

 set(TEST_SUITE_REMOTE_PORT "" CACHE STRING "Remote execution port")
 mark_as_advanced(TEST_SUITE_REMOTE_USER TEST_SUITE_REMOTE_PORT)
 
+# Run Under configuration for RunSafely.sh (will be set in lit.site.cfg)
+set(TEST_SUITE_RUN_UNDER "" CACHE STRING "RunSafely.sh run-under (-u) parameter")
+
 include(MakefileFunctions)
 include(SingleMultiSource)
 find_package(YACC)

lit.cfg

             runsafely_prefix += [ "-rc", config.remote_client ]
         if config.remote_port:
             runsafely_prefix += [ "-rp", config.remote_port ]
+    if config.run_under:
+        runsafely_prefix += [ "-u", config.run_under ]
     timeit = "%s/tools/timeit-target" % config.test_source_root
     timeout = "7200"
     runsafely_prefix += [ "-t", timeit, timeout, stdin, outfile ]

lit.site.cfg.in

 config.remote_host = "@TEST_SUITE_REMOTE_HOST@"
 config.remote_user = "@TEST_SUITE_REMOTE_USER@"
 config.remote_port = "@TEST_SUITE_REMOTE_PORT@"
+config.run_under = "@TEST_SUITE_RUN_UNDER@"
 
 lit_config.load_config(config, "@CMAKE_SOURCE_DIR@/lit.cfg")