a2bda2ea92
This option changes the thread local storage (TLS) model. Thread-local storage is a mechanism by which variables are allocated in a way that causes one instance of the variable per extant thread. i.global-dynamic Generates a generic TLS code. The code can be used everywhere and the code can access variables defined anywhere else. This setting causes the largest size code to be generated and uses the most run time to produce. ii.local-dynamic Generates an optimized TLS code. To use this setting, the thread-local variables must be defined in the same object in which they are referenced. iii.initial-exec Generates a restrictive, optimized TLS code. To use this setting, the thread-local variables accessed must be defined in one of the modules available to the program. iv.local-exec Generates the most restrictive TLS code. To use this setting, the thread-local variables must be defined in the executable. Optimize qemu cflags with '-ftls-model=initial-exec' which means we use initial-exec mode.