[Buildroot] [PATCH] package/reactcpp: new package

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

Hello,

Thanks for this contribution! See some comments below.

On Tue,  6 Dec 2016 14:26:43 +0100, Marcin Niestroj wrote:

> diff --git a/package/reactcpp/0001-Makefile-Cleanup-compiler-and-linker-flags.patch b/package/reactcpp/0001-Makefile-Cleanup-compiler-and-linker-flags.patch
> new file mode 100644
> index 0000000..a0b065a
> --- /dev/null
> +++ b/package/reactcpp/0001-Makefile-Cleanup-compiler-and-linker-flags.patch
> @@ -0,0 +1,82 @@
> +From 583b934dbd712e661e7c4eb994174bf71d88690c Mon Sep 17 00:00:00 2001
> +From: Marcin Niestroj <m.niestroj@grinn-global.com>
> +Date: Tue, 15 Nov 2016 14:51:47 +0100
> +Subject: [PATCH] Makefile: Cleanup compiler and linker flags
> +
> +Cleanup compiler and linker flags, so the library can be easily
> +cross-compiled by overwriting CPPFLAGS, CXXFLAGS and LDFLAGS:
> +
> +* Rename CPP into CXX, as we use this command for compiling, not
> +  preprocessing.
> +* Remove separate LD usage, use CXX instead. This is to still launch
> +  compiler command when user overrides CXX and LD commands.
> +* Define MY_CXXFLAGS and MY_LDFLAGS, which should always take place and
> +  not get overridden by user.
> +* Define AR command, which can be overidden by user.
> +---
> + src/Makefile | 26 +++++++++++++-------------
> + 1 file changed, 13 insertions(+), 13 deletions(-)
> +
> +diff --git a/src/Makefile b/src/Makefile
> +index 54e938a..5fb9763 100644
> +--- a/src/Makefile
> ++++ b/src/Makefile
> +@@ -1,8 +1,8 @@
> +-CPP		= g++
> ++AR		= ar
> ++CXX		= g++
> + RM		= rm -f
> +-CPPFLAGS	= -Wall -MMD -c -I. -std=c++11
> +-LD		= g++
> +-LD_FLAGS	= -Wall -shared
> ++MY_CXXFLAGS	= -Wall -MMD -c -I. -std=c++11
> ++MY_LDFLAGS	= -Wall -shared

You can also do:

override CXXFLAGS += ...
override LDFLAGS += ...

> diff --git a/package/reactcpp/Config.in b/package/reactcpp/Config.in
> new file mode 100644
> index 0000000..f6989e5
> --- /dev/null
> +++ b/package/reactcpp/Config.in
> @@ -0,0 +1,14 @@
> +config BR2_PACKAGE_REACTCPP
> +	bool "reactcpp"
> +	depends on BR2_INSTALL_LIBSTDCPP
> +	depends on BR2_TOOLCHAIN_HAS_THREADS

You have two dependencies here.

> +	select BR2_PACKAGE_C_ARES
> +	select BR2_PACKAGE_LIBEV
> +	help
> +	  REACT-CPP is an event loop library that utilizes the new
> +	  C++11 lambda functions to notify you when there is activity
> +	  on a filedescriptor or on a timer. Internally, it is a wrapper
> +	  around the libev library, and does therefore also depend on
> +	  that library.
> +
> +	  https://github.com/CopernicaMarketingSoftware/REACT-CPP

So you need a Config.in comment here about those dependencies. Check
other packages and the Buildroot manual for details.

> diff --git a/package/reactcpp/reactcpp.hash b/package/reactcpp/reactcpp.hash
> new file mode 100644
> index 0000000..c30dab6
> --- /dev/null
> +++ b/package/reactcpp/reactcpp.hash
> @@ -0,0 +1,2 @@
> +# Locally calculated
> +sha256 4af5d6a535ff7d8835d05db3490f2b62d6d791a4968ab45f479023868d7acdc8  reactcpp-v1.0.3.tar.gz
> diff --git a/package/reactcpp/reactcpp.mk b/package/reactcpp/reactcpp.mk
> new file mode 100644
> index 0000000..e198c3d
> --- /dev/null
> +++ b/package/reactcpp/reactcpp.mk
> @@ -0,0 +1,34 @@
> +################################################################################
> +#
> +# reactcpp
> +#
> +################################################################################
> +
> +REACTCPP_VERSION_MAJOR = 1.0
> +REACTCPP_VERSION_RAW = $(REACTCPP_VERSION_MAJOR).3
> +REACTCPP_VERSION = v$(REACTCPP_VERSION_RAW)

Just define the version as v$(REACTCPP_VERSION_MAJOR).3

> +REACTCPP_SITE = $(call github,CopernicaMarketingSoftware,REACT-CPP,$(REACTCPP_VERSION))
> +REACTCPP_LICENSE = Apache-2.0
> +REACTCPP_LICENSE_FILES = LICENSE
> +REACTCPP_DEPENDENCIES = c-ares libev
> +REACTCPP_INSTALL_STAGING = YES
> +
> +define REACTCPP_BUILD_CMDS
> +	$(MAKE) $(TARGET_CONFIGURE_OPTS) -C $(@D)

Please pass $(TARGET_MAKE_ENV) in the environment.

> +endef
> +
> +define REACTCPP_INSTALL_STAGING_CMDS
> +	$(MAKE) $(TARGET_CONFIGURE_OPTS) PREFIX=$(STAGING_DIR)/usr -C $(@D) install

Ditto.

> +endef
> +
> +REACTCPP_SO = libreactcpp.so.$(REACTCPP_VERSION_RAW)
> +
> +ifeq ($(BR2_STATIC_LIBS),)
> +define REACTCPP_INSTALL_TARGET_CMDS
> +	$(INSTALL) -D -m 0755 $(@D)/src/$(REACTCPP_SO) $(TARGET_DIR)/usr/lib/$(REACTCPP_SO)
> +	ln -sf $(REACTCPP_SO) $(TARGET_DIR)/usr/lib/libreactcpp.so.$(REACTCPP_VERSION_MAJOR)
> +	ln -sf $(REACTCPP_SO) $(TARGET_DIR)/usr/lib/libreactcpp.so
> +endef
> +endif

Why are you doing this instead of calling "make install" for
$(TARGET_DIR) ?

Thanks,

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