* was initialized in advance.
         * For example, When we shorten the following code:
         *     enum class C(val i: Int) {
         *         ONE(<expr>C.K</expr>)  // shorten C.K to K
         *         ;
         *         companion object {
         *             const val K = 1
         *         }
         *     }

#
# Other build options:
#     short_logs:       Only log errors during build, skip warnings.
#     verbose_logs:     Show all compiler warnings during build.
#     monolithic:       Build all TF C++ code into a single shared object.
#     dynamic_kernels:  Try to link all kernels dynamically (experimental).
#     dbg:              Build with debug info
#
# TF version options;
#     v2: Build TF v2
#