[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.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
---
 configure    |   60 ++++++++++++++++++++++++++++++++++++++++++++++++---------
 configure.in |   23 ++++++++++++---------
 2 files changed, 63 insertions(+), 20 deletions(-)

On Fri, 8 Feb 2013, Lukas Czerner wrote:

> Date: Fri,  8 Feb 2013 12:07:01 +0100
> From: Lukas Czerner <lczerner@redhat.com>
> To: linux-ext4@vger.kernel.org
> Cc: sandeen@redhat.com, tytso@mit.edu, Lukas Czerner <lczerner@redhat.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@redhat.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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