On Wed, Sep 07, 2016 at 02:59:38PM +0200, Anton Khirnov wrote:
> --- a/configure
> +++ b/configure
> @@ -986,6 +986,19 @@ check_cpp_condition(){
>
> +test_cflags_cpp(){
> + log test_cflags_cpp "$@"
> + flags=$1
> + condition=$2
> + shift 2
> + set -- $($cflags_filter "$flags")
> + check_cpp "$@" <<EOF
> +#if !($condition)
> +#error "unsatisfied condition: $condition"
> +#endif
> +EOF
> +}
check_cpp_condition()
> @@ -3698,7 +3712,15 @@ if test "$?" != 0; then
>
> add_cppflags -D_ISOC99_SOURCE
> -check_cflags -std=c99
> +
> +# some compilers silently accept -std=c11, so we also need to check that the
> +# version macro is defined properly
> +if test_cflags_cpp -std=c11 "__STDC_VERSION__ >= 201112L"; then
> + add_cflags -std=c11
> +else
> + check_cflags -std=c99
> +fi
> +
> @@ -4533,6 +4555,12 @@ check_header VideoDecodeAcceleration/VDADecoder.h
>
> +# it seems there are versions of clang in some distros that try to use the
> +# gcc headers, which explodes for stdatomic
> +# so we also check that atomics actually work here
> +check_header stdatomic.h &&
> + check_code cc "stdatomic.h" "atomic_int foo; atomic_store(&foo, 0)" ||
> disable stdatomic_h
check_func_headers()
Diego
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