[U-Boot] Compile v2017.03 on a system where Python 3 is default

[Jelle van der Waa]

On 03/28/17 at 05:30pm, Stefan Agner wrote:
> Hi,
> 
> When I try to compile U-Boot on my Arch Linux system I get the following

Python 3 needs some more TLC, I've been hacking on making binman work
out of the box with Python 3 (and retaining Python 2 compatibility). But
haven't been able to get it working yet. [1]

[1] https://github.com/jelly/u-boot/commits/binman_py3

> error:
> 
> LDFLAGS="" python ./lib/libfdt/setup.py \
>         "-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer    -include
> ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include
> -I./lib/libfdt -I./tools -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES
> -D_GNU_SOURCE " lib/libfdt/fdt.c lib/libfdt/fdt_ro.c lib/libfdt/fdt_rw.c
> lib/libfdt/fdt_strerror.c lib/libfdt/fdt_wip.c lib/libfdt/fdt_region.c
> lib/libfdt/fdt_sw.c tools/libfdt_wrap.c
> mv _libfdt.so tools/_libfdt.so
> mv: cannot stat '_libfdt.so': No such file or directory
> make[1]: *** [tools/Makefile:124: tools/_libfdt.so] Error 1
> make: *** [Makefile:1229: tools] Error 2
> 
> 
> As far as I can tell the issue is that python defaults on my system to
> python 3:
> $ python --version
> Python 3.6.0
> 
> I can fix the issue by explicitly ask for python2, not sure if that is
> the proper way to fix this though:
> 
> diff --git a/tools/Makefile b/tools/Makefile
> index 1c840d7ae2..c5e422edf9 100644
> --- a/tools/Makefile
> +++ b/tools/Makefile
> @@ -120,7 +120,7 @@ _libfdt.so-sharedobjs += $(LIBFDT_OBJS)
>  libfdt:
> 
>  tools/_libfdt.so: $(patsubst %.o,%.c,$(LIBFDT_OBJS))
> tools/libfdt_wrap.c
> -       LDFLAGS="$(HOSTLDFLAGS)" python $(srctree)/lib/libfdt/setup.py \
> +       LDFLAGS="$(HOSTLDFLAGS)" python2 $(srctree)/lib/libfdt/setup.py
> \
>                 "$(_hostc_flags)" $^
>         mv _libfdt.so $@
> 
> 
> It works, but with warnings:
> LDFLAGS="" python2 ./lib/libfdt/setup.py \
>         "-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer    -include
> ./include/libfdt_env.h -idirafterinclude -idirafter./arch/arm/include
> -I./lib/libfdt -I./tools -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES
> -D_GNU_SOURCE " lib/libfdt/fdt.c lib/libfdt/fdt_ro.c lib/libfdt/fdt_rw.c
> lib/libfdt/fdt_strerror.c lib/libfdt/fdt_wip.c lib/libfdt/fdt_region.c
> lib/libfdt/fdt_sw.c tools/libfdt_wrap.c
> In file included from /usr/include/python2.7/Python.h:8:0,
>                  from tools/libfdt_wrap.c:149:
> /usr/include/python2.7/pyconfig.h:1190:0: warning: "_POSIX_C_SOURCE"
> redefined
>  #define _POSIX_C_SOURCE 200112L
> 
> In file included from /usr/include/stdint.h:25:0,
>                  from
> /usr/lib/gcc/x86_64-pc-linux-gnu/6.3.1/include/stdint.h:9,
>                  from ././include/compiler.h:19,
>                  from ././include/libfdt_env.h:12,
>                  from <command-line>:0:
> /usr/include/features.h:225:0: note: this is the location of the
> previous definition
>  # define _POSIX_C_SOURCE 200809L
> 
> In file included from /usr/include/python2.7/Python.h:8:0,
>                  from tools/libfdt_wrap.c:149:
> /usr/include/python2.7/pyconfig.h:1212:0: warning: "_XOPEN_SOURCE"
> redefined
>  #define _XOPEN_SOURCE 600
> 
> In file included from /usr/include/stdint.h:25:0,
>                  from
> /usr/lib/gcc/x86_64-pc-linux-gnu/6.3.1/include/stdint.h:9,
>                  from ././include/compiler.h:19,
>                  from ././include/libfdt_env.h:12,
>                  from <command-line>:0:
> /usr/include/features.h:166:0: note: this is the location of the
> previous definition
>  # define _XOPEN_SOURCE 700
> 
> mv _libfdt.so tools/_libfdt.so
>   HOSTCC  tools/proftool
> ...
> 
> 
> --
> Stefan
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-- 
Jelle van der Waa