[PATCH libevdev] build: check for build/link flags harder

[Peter Hutterer]

On Sun, Nov 17, 2013 at 02:03:50PM +0100, David Herrmann wrote:
> Hi
> 
> On Sun, Nov 17, 2013 at 1:44 PM, Gaetan Nadon <memsize at videotron.ca> wrote:
> > From: David Herrmann <dh.herrmann at gmail.com>
> >
> > Use AC_LINK_IFELSE instead of AC_COMPILE_IFELSE to test for flags that
> > might succeed during compilation but not during linking. An example is gcc
> > compiled with libssp support but gnu-ld without it. In this case
> > -fstack-protector works fine during compilation but fails during linking
> > as several internal helpers are missing.
> >
> > Signed-off-by: Gaetan Nadon <memsize at videotron.ca>
> > ---
> >
> >         Applying maintenance to code obtained from systemd
> >         The original patch was not signed-off.
> 
> Fine by me:
> Signed-off-by: David Herrmann <dh.herrmann at gmail.com>
 
   f7acb3b..b8ffc23  master -> master

thanks.

Cheers,
   Peter
   
> > >  m4/attributes.m4 |    6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/m4/attributes.m4 b/m4/attributes.m4
> > index 7e080da..aa53ef2 100644
> > --- a/m4/attributes.m4
> > +++ b/m4/attributes.m4
> > @@ -42,9 +42,9 @@ AC_DEFUN([CC_CHECK_FLAG_APPEND], [
> >                   AS_TR_SH([cc_cv_$2_$3]),
> >            [eval "AS_TR_SH([cc_save_$2])='${$2}'"
> >             eval "AS_TR_SH([$2])='-Werror $3'"
> > -           AC_COMPILE_IFELSE([AC_LANG_SOURCE([int a = 0; int main(void) { return a; } ])],
> > -                                    [eval "AS_TR_SH([cc_cv_$2_$3])='yes'"],
> > -                                    [eval "AS_TR_SH([cc_cv_$2_$3])='no'"])
> > +           AC_LINK_IFELSE([AC_LANG_SOURCE([int a = 0; int main(void) { return a; } ])],
> > +                          [eval "AS_TR_SH([cc_cv_$2_$3])='yes'"],
> > +                          [eval "AS_TR_SH([cc_cv_$2_$3])='no'"])
> >             eval "AS_TR_SH([$2])='$cc_save_$2'"])
> >
> >    AS_IF([eval test x$]AS_TR_SH([cc_cv_$2_$3])[ = xyes],
> > --
> > 1.7.9.5
> >
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