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3.10 GOMP_STACKSIZE – Set default thread stack size

Set the default thread stack size in kilobytes. This is different from pthread_attr_setstacksize which gets the number of bytes as an argument. If the stacksize can not be set due to system constraints, an error is reported and the initial stacksize is left unchanged. If undefined, the stack size is system dependent.
See also:
GCC Patches Mailinglist, GCC Patches Mailinglist