On Wed, 2017-05-17 at 15:54 +0200, Martin Wilck wrote:
> +# $(call TEST_CC_OPTION,option,fallback)
> +# Test if the C compiler supports the option.
> +# Evaluates to "option" if yes, and "fallback" otherwise.
> +TEST_CC_OPTION = $(shell \
> + if $(CC) -o /dev/null -c "$(1)" -xc - <<<'int main(void){return 0;}'
> &>/dev/null; \
> + then \
> + echo "$(1)"; \
> + else \
> + echo "$(2)"; \
> + fi)
Since '<<<' is nonstandard, please consider to use 'echo' and a pipe instead.
See also http://pubs.opengroup.org/onlinepubs/9699919799/.
> +STACKPROT = $(call TEST_CC_OPTION,-fstack-protector-strong,-fstack-protector)
Please consider to use ":=" instead of "=" such that TEST_CC_OPTION gets called
once per "make" invocation instead of once per C file that is built.
Thanks,
Bart.
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