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python/lib/gen_external.py: pass '-x c' to emcc only

--- a/python/lib/gen_external.py

+++ b/python/lib/gen_external.py

@@ -77,7 +77,8 @@

         print("Warning: could not guess preprocessor, using env's CC")

         cpp_cmd = os.environ.get('CC', 'cc').split()

         cpp_cmd += ['-E']

-    cpp_cmd += ['-x', 'c']  # force C language (emcc defaults to c++)

+    if 'emcc' in cpp_cmd:

+        cpp_cmd += ['-x', 'c'] # emcc defaults to c++, force C language

     return cpp_cmd