Re: [PATCH v3] Makefile: Improve compiler header dependency check

> The Makefile enables CHECK_HEADER_DEPENDENCIES when the
> compiler supports generating header dependencies.
> Make the check use the same flags as the invocation
> to avoid a false positive when user-configured compiler
> flags contain incompatible options.
>
> For example, without this patch, trying to build universal
> binaries on a Mac using CFLAGS='-arch i386 -arch x86_64'
> produces:
>
> 	gcc-4.2: -E, -S, -save-temps and -M options are
> 	not allowed with multiple -arch flags
>
> Make the check use the same flags as the invocation to avoid
> false positives when user-configured compiler flags contain
> incompatible options.