[test] Fix clang-test for FreeBSD and NetBSD

Lit tries to inject the shared library paths, but no action is taken
when platform.system() is not recognized, results in an environment
variable with an empty name, which is illegal.

The patch fixes this mechanism for FreeBSD and NetBSD, and gives an
warning on other platforms, so that the latecomers don't have to spend
time on debugging lit.

Thanks Zhihao Yuan for the patch!

Differential Revision: https://reviews.llvm.org/D39162

llvm-svn: 316411

clang/test/Unit/lit.cfg.py

@@ -35,17 +35,23 @@ for symbolizer in ['ASAN_SYMBOLIZER_PATH', 'MSAN_SYMBOLIZER_PATH']:
     if symbolizer in os.environ:
         config.environment[symbolizer] = os.environ[symbolizer]
 
-shlibpath_var = ''
-if platform.system() == 'Linux':
-    shlibpath_var = 'LD_LIBRARY_PATH'
-elif platform.system() == 'Darwin':
-    shlibpath_var = 'DYLD_LIBRARY_PATH'
-elif platform.system() == 'Windows':
-    shlibpath_var = 'PATH'
+def find_shlibpath_var():
+    if platform.system() in ['Linux', 'FreeBSD', 'NetBSD']:
+        yield 'LD_LIBRARY_PATH'
+    elif platform.system() == 'Darwin':
+        yield 'DYLD_LIBRARY_PATH'
+    elif platform.system() == 'Windows':
+        yield 'PATH'
 
-# in stand-alone builds, shlibdir is clang's build tree
-# while llvm_libs_dir is installed LLVM (and possibly older clang)
-shlibpath = os.path.pathsep.join((config.shlibdir, config.llvm_libs_dir,
-                                 config.environment.get(shlibpath_var,'')))
-
-config.environment[shlibpath_var] = shlibpath
+for shlibpath_var in find_shlibpath_var():
+    # in stand-alone builds, shlibdir is clang's build tree
+    # while llvm_libs_dir is installed LLVM (and possibly older clang)
+    shlibpath = os.path.pathsep.join(
+        (config.shlibdir,
+         config.llvm_libs_dir,
+         config.environment.get(shlibpath_var, '')))
+    config.environment[shlibpath_var] = shlibpath
+    break
+else:
+    lit_config.warning("unable to inject shared library path on '{}'"
+                       .format(platform.system()))