Date:	Mon, 29 Jul 2013 14:57:49 +0200 (CEST)
From:	Lukáš Czerner <lczerner@...hat.com>
To:	linux-ext4@...r.kernel.org
cc:	sandeen@...hat.com, tytso@....edu
Subject: Re: [PATCH 1/3] e2fsprogs: Build external libblkid by default

On Fri, 8 Feb 2013, Lukas Czerner wrote:

> Date: Fri,  8 Feb 2013 12:07:01 +0100
> From: Lukas Czerner <lczerner@...hat.com>
> To: linux-ext4@...r.kernel.org
> Cc: sandeen@...hat.com, tytso@....edu, Lukas Czerner <lczerner@...hat.com>
> Subject: [PATCH 1/3] e2fsprogs: Build external libblkid by default
> 
> This commit changes configure script to build external libblkid library by
> default instead of building the local blkid. The reason is that the
> the external libblkid is where all the development takes place and it
> should be always preferred option. We still have an option
> '--enable-blkid' to enable local build of the blkid library.

As we've previously discussed I'll drop the series, however I think
that this particular patch might be actually useful. What do you
think Ted ?

(I might need to rebase this one)

Thanks!
-Lukas

> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> ---
>  configure    |   60 ++++++++++++++++++++++++++++++++++++++++++++++++---------
>  configure.in |   23 ++++++++++++---------
>  2 files changed, 63 insertions(+), 20 deletions(-)
> 
> diff --git a/configure b/configure
> index 84e7e03..5b91c01 100755
> --- a/configure
> +++ b/configure
> @@ -1497,7 +1497,7 @@ Optional Features:
>    --enable-blkid-debug    enable blkid debugging
>    --disable-testio-debug  disable the use of the test I/O manager for debugging
>    --disable-libuuid	  do not build private uuid library
> -  --disable-libblkid	  do not build private blkid library
> +  --enable-libblkid	  build private blkid library
>    --enable-quota	  enable quota support
>    --disable-debugfs   	  disable support of debugfs program
>    --disable-imager   	  disable support of e2image program
> @@ -5168,16 +5168,56 @@ $as_echo "Enabling private blkid library" >&6; }
>  fi
>  
>  else
> -  LIBBLKID='$(LIB)/libblkid'$LIB_EXT
> -DEPLIBBLKID=$LIBBLKID
> -STATIC_LIBBLKID='$(LIB)/libblkid'$STATIC_LIB_EXT
> -DEPSTATIC_LIBBLKID=$STATIC_LIBBLKID
> -PROFILED_LIBBLKID='$(LIB)/libblkid'$PROFILED_LIB_EXT
> -DEPPROFILED_LIBBLKID=$PROFILED_LIBBLKID
> -$as_echo "#define CONFIG_BUILD_FINDFS 1" >>confdefs.h
> +  if test -z "$PKG_CONFIG"; then
> +	as_fn_error $? "pkg-config not installed; please install it." "$LINENO" 5
> +fi
> +
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for blkid_get_cache in -lblkid" >&5
> +$as_echo_n "checking for blkid_get_cache in -lblkid... " >&6; }
> +if ${ac_cv_lib_blkid_blkid_get_cache+:} false; then :
> +  $as_echo_n "(cached) " >&6
> +else
> +  ac_check_lib_save_LIBS=$LIBS
> +LIBS="-lblkid $LIBBLKID $LIBS"
> +cat confdefs.h - <<_ACEOF >conftest.$ac_ext
> +/* end confdefs.h.  */
> +
> +/* Override any GCC internal prototype to avoid an error.
> +   Use char because int might match the return type of a GCC
> +   builtin and then its argument prototype would still apply.  */
> +#ifdef __cplusplus
> +extern "C"
> +#endif
> +char blkid_get_cache ();
> +int
> +main ()
> +{
> +return blkid_get_cache ();
> +  ;
> +  return 0;
> +}
> +_ACEOF
> +if ac_fn_c_try_link "$LINENO"; then :
> +  ac_cv_lib_blkid_blkid_get_cache=yes
> +else
> +  ac_cv_lib_blkid_blkid_get_cache=no
> +fi
> +rm -f core conftest.err conftest.$ac_objext \
> +    conftest$ac_exeext conftest.$ac_ext
> +LIBS=$ac_check_lib_save_LIBS
> +fi
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_blkid_blkid_get_cache" >&5
> +$as_echo "$ac_cv_lib_blkid_blkid_get_cache" >&6; }
> +if test "x$ac_cv_lib_blkid_blkid_get_cache" = xyes; then :
> +  LIBBLKID=`$PKG_CONFIG --libs blkid`;
> +	 STATIC_LIBBLKID=`$PKG_CONFIG --static --libs blkid`
> +else
> +  as_fn_error $? "external blkid library not found" "$LINENO" 5
> +fi
>  
> -{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Enabling private blkid library by default" >&5
> -$as_echo "Enabling private blkid library by default" >&6; }
> +BLKID_CMT=#
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Disabling private blkid library by default" >&5
> +$as_echo "Disabling private blkid library by default" >&6; }
>  
>  fi
>  
> diff --git a/configure.in b/configure.in
> index ac3cd92..68fc806 100644
> --- a/configure.in
> +++ b/configure.in
> @@ -509,7 +509,7 @@ AC_SUBST(PROFILED_LIBUUID)
>  AC_SUBST(DEPPROFILED_LIBUUID)
>  AC_SUBST(UUID_CMT)
>  dnl
> -dnl handle --disable-libblkid
> +dnl handle --enable-libblkid
>  dnl
>  PKG_PROG_PKG_CONFIG
>  LIBBLKID=
> @@ -521,7 +521,7 @@ DEPPROFILED_LIBBLKID=
>  BLKID_CMT=
>  AH_TEMPLATE([CONFIG_BUILD_FINDFS], [Define to 1 to compile findfs])
>  AC_ARG_ENABLE([libblkid],
> -[  --disable-libblkid	  do not build private blkid library],
> +[  --enable-libblkid	  build private blkid library],
>  if test "$enableval" = "no"
>  then
>  	if test -z "$PKG_CONFIG"; then
> @@ -546,14 +546,17 @@ else
>  	AC_MSG_RESULT([Enabling private blkid library])
>  fi
>  ,
> -LIBBLKID='$(LIB)/libblkid'$LIB_EXT
> -DEPLIBBLKID=$LIBBLKID
> -STATIC_LIBBLKID='$(LIB)/libblkid'$STATIC_LIB_EXT
> -DEPSTATIC_LIBBLKID=$STATIC_LIBBLKID
> -PROFILED_LIBBLKID='$(LIB)/libblkid'$PROFILED_LIB_EXT
> -DEPPROFILED_LIBBLKID=$PROFILED_LIBBLKID
> -AC_DEFINE(CONFIG_BUILD_FINDFS, 1)
> -AC_MSG_RESULT([Enabling private blkid library by default])
> +if test -z "$PKG_CONFIG"; then
> +	AC_MSG_ERROR([pkg-config not installed; please install it.])
> +fi
> +
> +AC_CHECK_LIB(blkid, blkid_get_cache,
> +	[LIBBLKID=`$PKG_CONFIG --libs blkid`;
> +	 STATIC_LIBBLKID=`$PKG_CONFIG --static --libs blkid`],
> +	[AC_MSG_ERROR([external blkid library not found])],
> +	[$LIBBLKID])
> +BLKID_CMT=#
> +AC_MSG_RESULT([Disabling private blkid library by default])
>  )
>  AC_SUBST(LIBBLKID)
>  AC_SUBST(DEPLIBBLKID)
> 
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