On Tue, 28 Jul 2020 at 20:58, Dmitry Fomichev <Dmitry.Fomichev@xxxxxxx> wrote: > > > -----Original Message----- > > From: Sitsofe Wheeler <sitsofe@xxxxxxxxx> > > Sent: Monday, July 27, 2020 1:23 AM > > To: Damien Le Moal <Damien.LeMoal@xxxxxxx> > > Cc: Dmitry Fomichev <Dmitry.Fomichev@xxxxxxx>; Jens Axboe > > <axboe@xxxxxxxxx>; fio@xxxxxxxxxxxxxxx; Shinichiro Kawasaki > > <shinichiro.kawasaki@xxxxxxx> > > Subject: Re: [PATCH 1/3] configure: improve libzbc version check > > > > On Mon, 27 Jul 2020 at 06:05, Damien Le Moal <Damien.LeMoal@xxxxxxx> > > wrote: > > > > > > On 2020/07/27 12:16, Dmitry Fomichev wrote: > > > > Avoid parsing pkg-config output and just use --atleast-version to > > > > check if libzbc is present and has an up to date version. Since > > > > this process may fail because pkg-config is not installed, verify > > > > pkg-config presence and warn the user if it was not found. > > > > > > > > Signed-off-by: Dmitry Fomichev <dmitry.fomichev@xxxxxxx> > > > > --- > > > > configure | 9 ++++++--- > > > > 1 file changed, 6 insertions(+), 3 deletions(-) > > > > > > > > diff --git a/configure b/configure > > > > index 5925e94f..0c4a96ec 100755 > > > > --- a/configure > > > > +++ b/configure > > > > @@ -2467,11 +2467,14 @@ int main(int argc, char **argv) > > > > } > > > > EOF > > > > if compile_prog "" "-lzbc" "libzbc"; then > > > > - libzbcvermaj=$(pkg-config --modversion libzbc | sed 's/\.[0-9]*\.[0- > > 9]*//') > > > > - if test "$libzbcvermaj" -ge "5" ; then > > > > + if $(pkg-config --atleast-version=5 libzbc); then > > > > Should this really be being done in a subshell? If it weren't done in > > a subshell wouldn't the if have failed due to a lack of pkg-config: > > > > % if not-pkg-config --atleast-version=5 libzbc; then echo y; else echo n; fi > > zsh: command not found: not-pkg-config > > n > > This line now does the same thing that is done to check libiscsi and libnbd > minimum versions in the same script. It works fine if pkg-config is installed > in the system. The version without the subshell also works, but it outputs > an additional error message if pkg-config is not installed - > > ./configure: line 2470: not-pkg-config: command not found > libzbc engine missing pkg-config, can't check library version > > I could remove the explicit check for pkg-config and do the version check > without the subshell, but I think the output is less confusing with the subshell > version. OK I see what you mean. Would it be better to have an explicit pkg-config check for all those engines? (There is also a general issue that fio's pkg-config usage won't cope well in cross compile environments but that's another issue...) -- Sitsofe | http://sucs.org/~sits/
