[U-Boot] [WIP] tools/env: cleanup host build flags

[Detlev Zundel <dzu@denx.de>]

Hello Daniel,

> This patch makes tools/env/Makefile more similar to tools/imls:
> - define HOSTSRCS and HOSTCPPFLAGS, so that .depend generation works.
> - include U-Boot headers using -idirafter to prevent picking up
>   u-boot/include/errno.h.
> - use HOSTCFLAGS_NOPED (fw_env.c does not conform to -pedantic).
> - use the cross compiler again (fw_printenv is intended for a
>   hosted environment on the target).
>
> Signed-off-by: Daniel Hobi <daniel.hobi@schmid-telecom.ch>
> Cc: Mike Frysinger <vapier@gentoo.org>
> Cc: Wolfgang Denk <wd@denx.de>

As this indeed fixes the cross-compilation problem:

Tested-by: Detlev Zundel <dzu@denx.de>

>  tools/env/Makefile |   15 ++++++++++-----
>  1 files changed, 10 insertions(+), 5 deletions(-)
>
>
> Hi Scott,
>
> In commit d984fed0 (makefiles: fixes for building build tools),
> you suggest that using $(CC) with host flags (HOSTCFLAGS, etc)
> is the correct way to use the cross compiler to generate binaries
> for a hosted environment on the target.
>
> On the other hand, you use $(HOSTCC) to generate the .depend file
> in rules.mk which leads to wrong dependencies.
>
> I think we need to differentiate three cases:
>  - (free-standing) U-Boot: use CC and CFLAGS
>  - native tools (mkimage, etc): use HOSTCC and HOSTCFLAGS
>  - Linux environment on the target (imls, fw_printenv):
>
>    Can we use CC and HOSTCFLAGS, or do we need a third set of
>    variables for flags?
>
>    If reusing HOSTCFLAGS: how do we fix dependency generation?

I also don't know, but this fixes a bug, so I want the patch in ;)

Cheers
  Detlev

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