relocation truncated to fit: R_X86_64_PC32 against symbolXXX

make之后,提示错误信息:
/tmp/ccrMebgb.o: In function `ExecSetCmd':
/home/redis/async_5.c:71:(.text+0x424): relocation truncated to fit: R_X86_64_PC32 against symbol `ac' defined in COMMON section in /tmp/ccrMebgb.o

原因:
代码中全局变量占内存过大 

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