[Buildroot] [PATCH v2 1/2] tbb: new package

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Hello,

On Thu, 28 Sep 2017 19:50:42 -0400, Bradford Barr wrote:

> diff --git a/package/tbb/0001-cross-compile.patch b/package/tbb/0001-cross-compile.patch
> new file mode 100644
> index 0000000..7c57603
> --- /dev/null
> +++ b/package/tbb/0001-cross-compile.patch
> @@ -0,0 +1,41 @@
> +Author: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>

This patch should be Git formatted and have a proper commit title and
description.


> diff --git a/package/tbb/Config.in b/package/tbb/Config.in
> new file mode 100644
> index 0000000..eda1f09
> --- /dev/null
> +++ b/package/tbb/Config.in
> @@ -0,0 +1,16 @@
> +config BR2_PACKAGE_TBB
> +	bool "tbb"
> +	depends on !BR2_STATIC_LIBS
> +	depends on BR2_INSTALL_LIBSTDCPP
> +	depends on BR2_TOOLCHAIN_HAS_THREADS
> +	depends on BR2_TOOLCHAIN_USES_GLIBC
> +	help
> +	  Intel(R) Threading Building Blocks (Intel(R) TBB) lets you
> +	  easily write parallel C++ programs that take full advantage
> +	  of multicore performance, that are portable, composable and
> +	  have future-proof scalability.
> +
> +	  https://www.threadingbuildingblocks.org/
> +
> +comment "tbb needs a toolchain w/ threads"
> +	depends on !BR2_TOOLCHAIN_HAS_THREADS

This comment is not in sync with the dependencies of the package: C++,
dynamic library, glibc.


> +TBB_SO_VERSION = 2
> +TBB_LIBS = libtbb libtbbmalloc libtbbmalloc_proxy
> +
> +ifeq ($(BR2_ENABLE_DEBUG),y)
> +TBB_BIN_PATH = $(@D)/build/linux_*_debug
> +else
> +TBB_BIN_PATH = $(@D)/build/linux_*_release
> +endif

What is the difference between the debug and release builds? In
general, we don't want to special case BR2_ENABLE_DEBUG in packages, as
we only want this to enable building with debugging symbols, and
nothing else. We used to handle BR2_ENABLE_DEBUG in lots of packages
and got rid of that a while ago, so I don't want to get back to this.

> +define TBB_INSTALL_LIBS
> +	$(foreach lib,$(TBB_LIBS),
> +		$(if $(BR2_ENABLE_DEBUG),
> +			$(INSTALL) -D -m 0755 $(TBB_BIN_PATH)/$(lib)_debug.so.$(TBB_SO_VERSION) \
> +				$(1)/usr/lib/$(lib)_debug.so.$(TBB_SO_VERSION) ;
> +			ln -sf $(lib)_debug.so.$(TBB_SO_VERSION) $(1)/usr/lib/$(lib)_debug.so

And this looks particularly painful here because the library doesn't
even have the same name on the filesystem depending on whether you're
doing a debug or a normal build. Clearly not good.

> +		,
> +			$(INSTALL) -D -m 0755 $(TBB_BIN_PATH)/$(lib).so.$(TBB_SO_VERSION) \
> +				$(1)/usr/lib/$(lib).so.$(TBB_SO_VERSION) ;
> +			ln -sf $(lib).so.$(TBB_SO_VERSION) $(1)/usr/lib/$(lib).so
> +		)
> +	)
> +endef

So unless you need it, I'd say drop the support for BR2_ENABLE_DEBUG
altogether.

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com