[openmp] Use config.test_extra_flags in archer and multiplex tests

[zhuhan0]

Summary

config.test_extra_flags is passed in from lit.site.cfg.in files, but they're not used in the LIT configs. This variable can be useful for distros which don't have the standard c/c++ headers in the default search paths. Since the tests run clang on c/c++ source code, we rely on test_extra_flags to pass in the necessary header files.

This is a similar setup that's also done in litomptarget https://github.com/llvm/llvm-project/blob/master/openmp/libomptarget/test/lit.cfg#L42 and openmp/runtime.

[jdoerfert]

LGTM

[zhuhan0]

Thanks @jdoerfert! I don't yet have commit access. Could you commit this for me?

[jdoerfert]

Eventually, I'm pretty booked the next few days. Maybe @protze.joachim finds the time.

[wenlei]

@zhuhan0 thanks for the fix - I just pushed the change on your behalf.

openmp/tools/archer/tests/lit.cfg

 # test format
 config.test_format = lit.formats.ShTest()
 
 # compiler flags
 config.test_flags = " -I " + config.test_source_root + \
     " -I " + config.omp_header_dir + \
     " -L " + config.omp_library_dir + \
     " -Wl,-rpath," + config.omp_library_dir + \
-    " " + config.test_archer_flags
+    " " + config.test_archer_flags + \
+    " " + config.test_extra_flags
 
 config.archer_flags = "-g -O1 -fsanitize=thread"
 
 
 # extra libraries
 libs = ""
 if config.has_libatomic:
     libs += " -latomic"

openmp/tools/multiplex/tests/lit.cfg

 config.test_format = lit.formats.ShTest()
 
 # compiler flags
 config.test_flags = " -I " + config.test_source_root + "/.."\
     " -I " + config.omp_header_dir + \
     " -L " + config.omp_library_dir + \
     " -I " + config.ompt_print_callback_dir + \
     " -Wl,-rpath," + config.omp_library_dir + \
-    " " + config.test_openmp_flags
+    " " + config.test_openmp_flags + \
+    " " + config.test_extra_flags
 
 # Allow XFAIL to work
 config.target_triple = [ ]
 for feature in config.test_compiler_features:
     config.available_features.add(feature)
 
 # Setup environment to find dynamic library at runtime
 append_dynamic_library_path(config.omp_library_dir)