[Buildroot] [Patch v7 01/10] rustc: new virtual package

["Jörg Krause" <joerg.krause@embedded.rocks>]

Hi Eric,

On Sun, 2017-07-23 at 10:11 +0200, Eric Le Bihan wrote:
> The compiler for the Rust programming language is called rustc.
> 
> There is only one reference implementation for it, based on LLVM, from
> the Rust project [1]. It can generate code for various architectures so
> it can be labeled as a cross-compiler. But, as for GCC, building it
> from source takes time.
> 
> So it would be sensible to have at least one package which provides it
> as a pre-built version, fetched from the upstream project. Later another
> package can be added, to build it from source code.
> 
> In addition to the compiler, the standard library for the host and/or
> the target should also be fetched/built.
> 
> So, add a virtual package named rustc to enable support for multiple
> providers.
> 
> Currently, only the host variant will be available to allow the user to
> cross-compile Rust programs for the target.
> 
> [1] http://rust-lang.org
> 
> Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
> ---
>  package/rustc/Config.in.host |  5 +++++
>  package/rustc/rustc.mk       | 25 +++++++++++++++++++++++++
>  2 files changed, 30 insertions(+)
>  create mode 100644 package/rustc/Config.in.host
>  create mode 100644 package/rustc/rustc.mk
> 
> diff --git a/package/rustc/Config.in.host b/package/rustc/Config.in.host
> new file mode 100644
> index 0000000..fef78a7
> --- /dev/null
> +++ b/package/rustc/Config.in.host
> @@ -0,0 +1,5 @@
> +config BR2_PACKAGE_HAS_HOST_RUSTC
> +	bool
> +
> +config BR2_PACKAGE_PROVIDES_HOST_RUSTC
> +	string

According to the manual about the virtual package a "depends on
BR2_PACKAGE_HAS_SOMETHING_VIRTUAL" should be added here.

> diff --git a/package/rustc/rustc.mk b/package/rustc/rustc.mk
> new file mode 100644
> index 0000000..9bbe29f
> --- /dev/null
> +++ b/package/rustc/rustc.mk
> @@ -0,0 +1,25 @@
> +################################################################################
> +#
> +# rustc
> +#
> +################################################################################
> +
> +RUST_TARGET_NAME := $(subst buildroot,unknown,$(GNU_TARGET_NAME))
> +
> +ifeq ($(BR2_ARM_CPU_ARMV7A),y)
> +RUST_TARGET_NAME := $(subst arm-,armv7-,$(RUST_TARGET_NAME))
> +endif
> +
> +ifeq ($(BR2_mips64)$(BR2_mips64el),y)
> +RUST_TARGET_NAME := $(subst -gnu,-gnuabi64,$(RUST_TARGET_NAME))
> +endif
> +
> +ifeq ($(HOSTARCH),x86_64)
> +RUST_HOST_ARCH = x86_64
> +else ifeq ($(HOSTARCH),x86)
> +RUST_HOST_ARCH = i686
> +endif
> +
> +RUST_HOST_NAME = $(RUST_HOST_ARCH)-unknown-linux-gnu
> 
> +$(eval $(host-virtual-package))

Considering this commit as adding a virtual package for the Rust
compiler, I would expect only the last line to be present and
RUST_TARGET_NAME and RUST_HOST_ARCH to be added later be a follow up
patch of the series.