Re: [Qemu-devel] [PULL 06/10] configure: dtc: Probe for libfdt_env.h

["Andreas Färber" <afaerber@suse.de>]

Am 14.06.2013 16:53, schrieb Peter Maydell:
> From: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
> 
> Currently QEMU provides a local clone of the file libfdt_env.h in
> /include. This file is supposed to come with the libfdt package and is
> only needed for broken installs of libfdt. Now that we have submodule
> dtc, just ignore these broken installs and prompt for the dtc submodule
> install instead. QEMU's local libfdt_env.h is removed accordingly.
> 
> Manifests as a bug when building QEMU with modern libfdt. The new
> version of libfdt does not compile when QEMUs libfdt_env.h takes
> precedence over the hosts.
> 
> Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
> Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
> Acked-by: David Gibson <david@gibson.dropbear.id.au>
> Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
> Acked-by: Paolo Bonzini <pbonzini@redhat.com>
> Message-id: 9b6a3a52e3f46cfbc1ded9ab56385ec045e46705.1369628289.git.peter.crosthwaite@xilinx.com
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>  configure            |    2 ++
>  include/libfdt_env.h |   36 ------------------------------------
>  2 files changed, 2 insertions(+), 36 deletions(-)
>  delete mode 100644 include/libfdt_env.h
> 
> diff --git a/configure b/configure
> index 8732185..31b7783 100755
> --- a/configure
> +++ b/configure
> @@ -2488,7 +2488,9 @@ fi
>  # fdt probe
>  if test "$fdt" != "no" ; then
>    fdt_libs="-lfdt"
> +  # explicitly check for libfdt_env.h as it is missing in some stable installs
>    cat > $TMPC << EOF
> +#include <libfdt_env.h>
>  int main(void) { return 0; }
>  EOF
>    if compile_prog "" "$fdt_libs" ; then

As far as I can see, 1.3.0 is the latest available stable dtc version,
and it doesn't install libfdt_env.h yet apparently. Any chance we can
restore build with dtc 1.3.0 tarball (it used to work fine) while
keeping newer versions working?

Also it seems that dtc submodule build is not multithreading-safe:

$ make -j6
[...]
	CHK version_gen.h
	UPD version_gen.h
	 DEP /home/andreas/QEMU/qemu-cpu/dtc/dtc.c
	CHK version_gen.h
	 CC libfdt/fdt.o
	 CC libfdt/fdt_ro.o
	 CC libfdt/fdt_sw.o
	 CC libfdt/fdt_wip.o
	 CC libfdt/fdt_rw.o
	 CC libfdt/fdt_strerror.o
	 AR libfdt/libfdt.a
ar: two different operation options specified
make[1]: *** [libfdt/libfdt.a] Fehler 1
make: *** [subdir-dtc] Fehler 2

$ make
	CHK version_gen.h
	 AR libfdt/libfdt.a
ar: creating libfdt/libfdt.a
a - libfdt/fdt.o
a - libfdt/fdt_ro.o
a - libfdt/fdt_wip.o
a - libfdt/fdt_sw.o
a - libfdt/fdt_rw.o
a - libfdt/fdt_strerror.o
  GEN   qapi-types.c
[...]

Regards,
Andreas

> diff --git a/include/libfdt_env.h b/include/libfdt_env.h
> deleted file mode 100644
> index 3667d4c..0000000
> --- a/include/libfdt_env.h
> +++ /dev/null
> @@ -1,36 +0,0 @@
> -/*
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License, version 2, as
> - * published by the Free Software Foundation.
> - *
> - * This program is distributed in the hope that it will be useful,
> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> - * GNU General Public License for more details.
> - *
> - * You should have received a copy of the GNU General Public License
> - * along with this program; if not, see <http://www.gnu.org/licenses/>.
> - *
> - * Copyright IBM Corp. 2008
> - * Authors: Hollis Blanchard <hollisb@us.ibm.com>
> - *
> - */
> -
> -#ifndef _LIBFDT_ENV_H
> -#define _LIBFDT_ENV_H
> -
> -#include "qemu/bswap.h"
> -
> -#ifdef HOST_WORDS_BIGENDIAN
> -#define fdt32_to_cpu(x)  (x)
> -#define cpu_to_fdt32(x)  (x)
> -#define fdt64_to_cpu(x)  (x)
> -#define cpu_to_fdt64(x)  (x)
> -#else
> -#define fdt32_to_cpu(x)  bswap32(x)
> -#define cpu_to_fdt32(x)  bswap32(x)
> -#define fdt64_to_cpu(x)  bswap64(x)
> -#define cpu_to_fdt64(x)  bswap64(x)
> -#endif
> -
> -#endif /* _LIBFDT_ENV_H */
> 


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