How do I increase the stack size when compiling with Clang on OS X?

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The linker, rather than the compiler, is responsible for setting the stack size of the main thread. The man page for ld contains the following:

-stack_size size
    Specifies the maximum stack size for the main thread in a program. Without this
    option a program has a 8MB stack. The argument size is a hexadecimal number with
    an optional leading 0x. The size should be an even multiple of 4KB, that is the
    last three hexadecimal digits should be zero.

For instance, to specify a 16MB stack you could do the following:

mrowe@apollo:~$ cc -Wl,-stack_size -Wl,0x1000000 -o test test.m
mrowe@apollo:~$ otool -lV test | grep stack
 stacksize 16777216

Note the -Wl, prefix on the arguments passed to cc to have it pass them on to the linker.

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