Re: [Qemu-devel] [PATCH 2/3] configure: Default to enable module build

["Andreas Färber" <afaerber@suse.de>]

Am 12.01.2015 um 05:43 schrieb Fam Zheng:
> We have module build support around for a while, but also had it bitrot
> several times. It probably makes sense to enable it by default so that
> people can notice and use it.
> 
> Counterpart to --enable-modules, which is turned as default,
> --disable-modules is added to suppress it. If both are omitted, the
> support is guesses as usual.
> 
> Signed-off-by: Fam Zheng <famz@redhat.com>

General idea seems okay, however an error handling nit below.

> ---
>  configure | 96 ++++++++++++++++++++++++++++++++++++++++++++-------------------
>  1 file changed, 67 insertions(+), 29 deletions(-)
> 
> diff --git a/configure b/configure
> index 7539645..2015179 100755
> --- a/configure
> +++ b/configure
> @@ -271,7 +271,7 @@ gcov_tool="gcov"
>  EXESUF=""
>  DSOSUF=".so"
>  LDFLAGS_SHARED="-shared"
> -modules="no"
> +modules=""
>  prefix="/usr/local"
>  mandir="\${prefix}/share/man"
>  datadir="\${prefix}/share"
> @@ -768,6 +768,9 @@ for opt do
>    --enable-modules)
>        modules="yes"
>    ;;
> +  --disable-modules)
> +      modules="no"
> +  ;;
>    --cpu=*)
>    ;;
>    --target-list=*) target_list="$optarg"
> @@ -1259,7 +1262,8 @@ Advanced options (experts only):
>    --sysconfdir=PATH        install config in PATH$confsuffix
>    --localstatedir=PATH     install local state in PATH (set at runtime on win32)
>    --with-confsuffix=SUFFIX suffix for QEMU data inside datadir/libdir/sysconfdir [$confsuffix]
> -  --enable-modules         enable modules support
> +  --enable-modules         enable modules support (default)
> +  --disable-modules        enable modules support
>    --enable-debug-tcg       enable TCG debugging
>    --disable-debug-tcg      disable TCG debugging (default)
>    --enable-debug-info      enable debugging information (default)
> @@ -2699,22 +2703,26 @@ if test "$mingw32" = yes; then
>  else
>      glib_req_ver=2.12
>  fi
> -glib_modules=gthread-2.0
> -if test "$modules" = yes; then
> -    glib_modules="$glib_modules gmodule-2.0"
> -fi
>  
> -for i in $glib_modules; do
> -    if $pkg_config --atleast-version=$glib_req_ver $i; then
> -        glib_cflags=`$pkg_config --cflags $i`
> -        glib_libs=`$pkg_config --libs $i`
> -        CFLAGS="$glib_cflags $CFLAGS"
> -        LIBS="$glib_libs $LIBS"
> -        libs_qga="$glib_libs $libs_qga"
> -    else
> -        error_exit "glib-$glib_req_ver $i is required to compile QEMU"
> -    fi
> -done
> +glib_module_try_config()
> +{
> +  if $pkg_config --atleast-version=$glib_req_ver $1; then
> +    local probe_cflags=$($pkg_config --cflags $1)
> +    local probe_libs=$($pkg_config --libs $1)
> +    CFLAGS="$probe_cflags $CFLAGS"
> +    LIBS="$probe_libs $LIBS"
> +    libs_qga="$probe_libs $libs_qga"
> +    glib_cflags="$probe_cflags $glib_cflags"
> +    glib_libs="$probe_libs $glib_libs"
> +    return 0
> +  else
> +    return 1
> +    error_exit "glib-$glib_req_ver $i is required to compile QEMU"

Is this error_exit ever executed? I.e., shouldn't the two lines be
reordered?

> +  fi
> +}
> +
> +glib_module_try_config gthread-2.0 || \
> +  error_exit "glib-$glib_req_ver gthread-2.0 is required to compile QEMU"

Depending on the above, we might drop this error_exit duplication?

Regards,
Andreas

>  
>  # g_test_trap_subprocess added in 2.38. Used by some tests.
>  glib_subprocess=yes
> @@ -2723,19 +2731,49 @@ if ! $pkg_config --atleast-version=2.38 glib-2.0; then
>  fi
>  
>  ##########################################
> -# SHA command probe for modules
> -if test "$modules" = yes; then
> -    shacmd_probe="sha1sum sha1 shasum"
> -    for c in $shacmd_probe; do
> -        if has $c; then
> -            shacmd="$c"
> -            break
> -        fi
> -    done
> -    if test "$shacmd" = ""; then
> -        error_exit "one of the checksum commands is required to enable modules: $shacmd_probe"
> +# SHA command and gmodule-2.0 probe for modules
> +# return 0 if probe succeeds
> +# $1: true - force mode, exit if probe fail
> +#     false - optoinal mode, return 1 if probe fail
> +module_try_enable()
> +{
> +  force=$1
> +  shacmd_probe="sha1sum sha1 shasum"
> +  for c in $shacmd_probe; do
> +    if has $c; then
> +      shacmd="$c"
> +      break
>      fi
> -fi
> +  done
> +  if test "$shacmd" = ""; then
> +    if $force; then
> +      error_exit "one of the checksum commands is required to enable modules: $shacmd_probe"
> +    else
> +      modules="no"
> +      return
> +    fi
> +  fi
> +  if ! glib_module_try_config gmodule-2.0; then
> +    if $force; then
> +      error_exit "glib-$glib_req_ver gthread-2.0 is required to compile QEMU"
> +    else
> +      modules="no"
> +      return
> +    fi
> +  fi
> +  modules="yes"
> +}
> +
> +case "$modules" in
> +  yes)
> +    module_try_enable true
> +    ;;
> +  "")
> +    module_try_enable false
> +    ;;
> +  no)
> +    ;;
> +esac
>  
>  ##########################################
>  # pixman support probe

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