[Buildroot] [RFC, PATCH 3/8] package/ncurses: Allow building wide char support

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

Dear Jeremy Kerr,

On Thu, 16 Jan 2014 16:52:18 +0800, Jeremy Kerr wrote:

>  if BR2_PACKAGE_NCURSES
> +config BR2_PACKAGE_NCURSES_WIDEC

One empty line between the if line and the config line.

> +	bool "enable wide char support"
> +	depends on BR2_PACKAGE_NCURSES

dependency not needed since you're inside a if BR2_PACKAGE_NCURSES.

I believe this option most likely depends on BR2_USE_WCHAR.

Also, maybe name the option BR2_PACKAGE_NCURSES_WCHAR, to match the
BR2_USE_WCHAR name we're already using in Buildroot to talk about wide
char support.

> +	help
> +	  Enable wide char & UTF-8 support in ncurses libraries
>  
>  config BR2_PACKAGE_NCURSES_TARGET_PANEL
>  	bool "ncurses libpanel in target"
> diff --git a/package/ncurses/ncurses.mk b/package/ncurses/ncurses.mk
> index f3319763..ba4cacd1 100644
> --- a/package/ncurses/ncurses.mk
> +++ b/package/ncurses/ncurses.mk
> @@ -12,7 +12,7 @@ HOST_NCURSES_DEPENDENCIES =
>  NCURSES_PROGS = clear infocmp tabs tic toe tput tset
>  NCURSES_LICENSE = MIT with advertising clause
>  NCURSES_LICENSE_FILES = README
> -NCURSES_CONFIG_SCRIPTS = ncurses5-config
> +NCURSES_CONFIG_SCRIPTS = ncurses$(W)5-config
>  
>  NCURSES_CONF_OPT = \
>  	$(if $(BR2_PREFER_STATIC_LIB),--without-shared,--with-shared) \
> @@ -36,6 +36,15 @@ ifeq ($(BR2_PACKAGE_BUSYBOX),y)
>  	NCURSES_DEPENDENCIES += busybox
>  endif
>  
> +ifeq ($(BR2_PACKAGE_NCURSES_WIDEC),y)
> +NCURSES_CONF_OPT += --enable-widec
> +W=w
> +W_LINK=ln -sf
> +else
> +W=
> +W_LINK=:
> +endif

We really don't want to have variables named W and W_LINK. The variable
namespace in Buildroot is global. So if one package defines W, and
another package uses it, we screwed. So all variables should be
prefixed by the name of the package.

> +
>  ifneq ($(BR2_ENABLE_DEBUG),y)
>  NCURSES_CONF_OPT += --without-debug
>  endif
> @@ -48,19 +57,22 @@ ifneq ($(BR2_PREFER_STATIC_LIB),y)
>  
>  ifeq ($(BR2_PACKAGE_NCURSES_TARGET_PANEL),y)
>  define NCURSES_INSTALL_TARGET_PANEL
> -	cp -dpf $(NCURSES_DIR)/lib/libpanel.so* $(TARGET_DIR)/usr/lib/
> +	cp -dpf $(NCURSES_DIR)/lib/libpanel$(W).so* $(TARGET_DIR)/usr/lib/
> +	$(W_LINK) libpanelw.so $(TARGET_DIR)/usr/lib/libpanel.so
>  endef
>  endif
>  
>  ifeq ($(BR2_PACKAGE_NCURSES_TARGET_FORM),y)
>  define NCURSES_INSTALL_TARGET_FORM
> -	cp -dpf $(NCURSES_DIR)/lib/libform.so* $(TARGET_DIR)/usr/lib/
> +	cp -dpf $(NCURSES_DIR)/lib/libform$(W).so* $(TARGET_DIR)/usr/lib/
> +	$(W_LINK) libformw.so $(TARGET_DIR)/usr/lib/libform.so
>  endef
>  endif
>  
>  ifeq ($(BR2_PACKAGE_NCURSES_TARGET_MENU),y)
>  define NCURSES_INSTALL_TARGET_MENU
> -	cp -dpf $(NCURSES_DIR)/lib/libmenu.so* $(TARGET_DIR)/usr/lib/
> +	cp -dpf $(NCURSES_DIR)/lib/libmenu$(W).so* $(TARGET_DIR)/usr/lib/
> +	$(W_LINK) libmenuw.so $(TARGET_DIR)/usr/lib/libmenu.so
>  endef
>  endif
>  
> @@ -78,7 +90,8 @@ endif
>  
>  define NCURSES_INSTALL_TARGET_CMDS
>  	mkdir -p $(TARGET_DIR)/usr/lib
> -	$(if $(BR2_PREFER_STATIC_LIB),,cp -dpf $(NCURSES_DIR)/lib/libncurses.so* $(TARGET_DIR)/usr/lib/)
> +	$(if $(BR2_PREFER_STATIC_LIB),,cp -dpf $(NCURSES_DIR)/lib/libncurses$(W).so* $(TARGET_DIR)/usr/lib/)
> +	$(W_LINK) libncursesw.so $(TARGET_DIR)/usr/lib/libncurses.so
>  	$(NCURSES_INSTALL_TARGET_PANEL)
>  	$(NCURSES_INSTALL_TARGET_FORM)
>  	$(NCURSES_INSTALL_TARGET_MENU)
> @@ -101,6 +114,33 @@ define NCURSES_INSTALL_TARGET_CMDS
>  	cp -dpf $(STAGING_DIR)/usr/share/terminfo/s/screen $(TARGET_DIR)/usr/share/terminfo/s
>  endef # NCURSES_INSTALL_TARGET_CMDS
>  
> +define NCURSES_POST_INSTALL_SYMLINK
> +	$(W_LINK) libncursesw.so $(STAGING_DIR)/usr/lib/libncurses.so
> +endef
> +NCURSES_POST_INSTALL_STAGING_HOOKS += NCURSES_POST_INSTALL_SYMLINK
> +
> +ifeq ($(BR2_PACKAGE_NCURSES_TARGET_PANEL),y)
> +define NCURSES_POST_INSTALL_SYMLINK_PANEL
> +	$(W_LINK) libpanelw.so $(STAGING_DIR)/usr/lib/libpanel.so
> +endef
> +NCURSES_POST_INSTALL_STAGING_HOOKS += NCURSES_POST_INSTALL_SYMLINK_PANEL
> +endif
> +
> +ifeq ($(BR2_PACKAGE_NCURSES_TARGET_FORM),y)
> +define NCURSES_POST_INSTALL_SYMLINK_FORM
> +	$(W_LINK) libformw.so $(STAGING_DIR)/usr/lib/libform.so
> +endef
> +NCURSES_POST_INSTALL_STAGING_HOOKS += NCURSES_POST_INSTALL_SYMLINK_FORM
> +endif
> +
> +ifeq ($(BR2_PACKAGE_NCURSES_TARGET_MENU),y)
> +define NCURSES_POST_INSTALL_SYMLINK_MENU
> +	$(W_LINK) libmenuw.so $(STAGING_DIR)/usr/lib/libmenu.so
> +endef
> +NCURSES_POST_INSTALL_STAGING_HOOKS += NCURSES_POST_INSTALL_SYMLINK_MENU
> +endif

Pffiou, that's a lot of things. Maybe we could refactor this a little
with the target installation to do something a bit smarter like:

NCURSES_LIBS-y += libncurses
NCURSES_LIBS-$(BR2_PACKAGE_NCURSES_TARGET_MENU) += libmenu
NCURSES_LIBS-$(BR2_PACKAGE_NCURSES_TARGET_PANEL) += libpanel
NCURSES_LIBS-$(BR2_PACKAGE_NCURSES_TARGET_FORM) += libform

and then use $(NCURSES_LIBS-y) and some loops in target installation
and in a staging post installation hook to create the appropriate
symbolic links.

Thanks!

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