[Buildroot] Several issues with building multiple "projects" forsame architecture

[Ulf Samuelsson <ulf@atmel.com>]

From: "Jonathan Nalley" <buildroot@bluebot.org>
To: <buildroot@uclibc.org>
Sent: Monday, October 29, 2007 4:55 PM
Subject: [Buildroot] Several issues with building multiple "projects" forsame architecture


>I am using the buildroot to build for several different boards, some of them
> have the same CPU architecture (PPC405GP/EP).  I have noticed some issues
> with the "project" concept in the buildroot.  Since the builds are for the
> same architecture the toolchain is created under "build_powerpc".
> Everything works fine for the first board, but for subsequent builds for
> different "project" names things are missing under
> "project_build_powerpc/PROJECT_NAME/root".  Specifically:
> 
> /root/lib/libgcc_s.so
> /root/usr/lib/libstdc++.so
> /root/usr/sbin/ethtool
> 
> This is because the make files that install those files check for:
> 
> $(GCC_BUILD_DIR2)/.libs_installed
> 
> and
> 
> $(ETHTOOL_DIR)/.installed
> 
> (There are several other packages whose make files also behave this way)
> 
> The problem with this is that the files are only installed for the first
> project, subsequent projects see the .installed file in the BUILD directory
> and think that files have already been copied to the TARGET directory.  Is
> there a reason that the buildroot relies on .installed files instead of the
> actual target file?
> 
> For example to fix ethtool I made the following change:
> 
> diff -r ff93bc269d3d buildroot/package/ethtool/ethtool.mk
> --- a/buildroot/package/ethtool/ethtool.mk      Mon Oct 29 10:03:23 2007
> -0500
> +++ b/buildroot/package/ethtool/ethtool.mk      Mon Oct 29 10:50:36 2007
> -0500
> @@ -33,11 +33,11 @@ ETHTOOL_CAT:=$(ZCAT)
> $(ETHTOOL_DIR)/ethtool: $(ETHTOOL_DIR)/.configured
>        $(MAKE) CC=$(TARGET_CC) -C $(ETHTOOL_DIR)
> 
> -$(ETHTOOL_DIR)/.installed: $(ETHTOOL_DIR)/ethtool
> +$(TARGET_DIR)/usr/sbin/ethtool: $(ETHTOOL_DIR)/ethtool
>        cp $(ETHTOOL_DIR)/ethtool $(TARGET_DIR)/usr/sbin
>        touch $@
> 
> -ethtool: uclibc $(ETHTOOL_DIR)/.installed
> +ethtool: uclibc $(TARGET_DIR)/usr/sbin/ethtool
> 
> ethtool-source: $(DL_DIR)/$(ETHTOOL_SOURCE)


It might be better to define a dependencies directory,
$(DEPENDENCIES_DIR) = project_build_dir/$(PROJECT)/depend
so you can install the ".*' files in this directory.
In many places, you just do
make DESTDIR=xxx -C <package_dir> install


Best Regards
Ulf Samuelsson