Re: [PATCH V2 2/2] scripts: dtc: Build fdtoverlay and fdtdump tools

[Frank Rowand]

On 1/6/21 11:15 PM, Viresh Kumar wrote:
> We will start building overlays for platforms soon in the kernel and
> would need these tools going forward. Lets start building them.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
> ---
>  scripts/dtc/Makefile | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
> index 4852bf44e913..c607980a5c17 100644
> --- a/scripts/dtc/Makefile
> +++ b/scripts/dtc/Makefile
> @@ -1,12 +1,18 @@
>  # SPDX-License-Identifier: GPL-2.0
>  # scripts/dtc makefile
>  
> -hostprogs-always-$(CONFIG_DTC)		+= dtc
> +hostprogs-always-$(CONFIG_DTC)		+= dtc fdtdump fdtoverlay
>  hostprogs-always-$(CHECK_DT_BINDING)	+= dtc
>  
>  dtc-objs	:= dtc.o flattree.o fstree.o data.o livetree.o treesource.o \
>  		   srcpos.o checks.o util.o
>  dtc-objs	+= dtc-lexer.lex.o dtc-parser.tab.o
> +fdtdump-objs	:= fdtdump.o util.o
> +

# The upstream project builds libfdt as a separate library.  We are choosing to
# instead directly link the libfdt object files into fdtoverly

> +libfdt_dir	= libfdt
> +libfdt-objs	:= fdt.o fdt_ro.o fdt_wip.o fdt_sw.o fdt_rw.o fdt_strerror.o fdt_empty_tree.o fdt_addresses.o fdt_overlay.o
> +libfdt		= $(addprefix $(libfdt_dir)/,$(libfdt-objs))
> +fdtoverlay-objs	:= $(libfdt) fdtoverlay.o util.o
>  
>  # Source files need to get at the userspace version of libfdt_env.h to compile
>  HOST_EXTRACFLAGS += -I $(srctree)/$(src)/libfdt
> 

In general, I am a proponent of using shared libraries (which the upstream project
builds by default) because if a security bug in the library is fixed, it is fixed
for all users of the library.

In this specific case, I actually prefer the implementation that the patch provides
(directly linking the library object files into fdtoverlay, which uses the library)
because it is the only user of the library _and_ fdtoverlay will not inadvertently
use the system wide libfdt if it happens to be installed (as it is on my system).

Any thoughts on this Rob?

-Frank