IllegalinstructiononARMincJSON_Delete

On ARMv7l the following code causes an "Illegal instruction" while it works on X86/X64.

Program (compiled using gcc directly at the device --> no invalid cross compile settings):

12345678910111213CcJSON *root cJSON_ParseWithLength(data, datasize);if (cJSON_IsObject(root)) {  cJSON *op cJSON_GetObjectItem(root, "op");  char *op_name cJSON_GetStringValue(op);  if (op_name) {    printf("op: %s\n", op_name);    free(op_name);  }  printf("Crash happens between here ...\n");  cJSON_Delete(root);  printf("... and here\n");}

Input:

is a valid JSON with {op: "something"},

is strlen(data)

Output:

123op: somethingCrash happens between here ...Illegal instruction

Questions:1) Is there some (obvious) mistake with the code above?2) Is there a known issue for ARM?3) Is there any unaligned memory access (something that will cause issues on ARM but not on X86).4) Any other hint?

该提问来源于开源项目：DaveGamble/cJSON

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