Re: [PATCH] meson: Check for stdarg.h

On Wed, Sep 02, 2020 at 02:07:54PM +0200, Michal Privoznik wrote: > As it turns out, one of my previous commits in which I removed > checking for stdarg.h was too aggressive. Long story short, the > readline public headers rely on stdarg.h and what is worse, they > expect us to declare the autotools style of macro (HAVE_STDARG_H) > if the header file exists. If we don't do it then compiling virsh > on macos fails. > > See 9ea3424a178 for more info. Ewww.... Deprecated in 2000, removed in 2013, then immediately readded to "fix" apps which still relied on K&R C with no function prototypes. The readline maintainer is more forgiving of ancient application code than I would be :-) 30 years since arrival of ANSI C is enough time to update code to use function prototypes, especially if you want to build against a readline library released in 2020, as opposed to the old version released years ago. > > Fixes: 85808b73846f93d656b4c81b6ebddd2dc3881bf6 > Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; > --- > meson.build | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/meson.build b/meson.build > index 1aad385ad1..98f7545495 100644 > --- a/meson.build > +++ b/meson.build > @@ -1333,8 +1333,12 @@ if readline_dep.found() > endif > endif > > - # We need this to avoid compilation issues with modern compilers. > - # See 9ea3424a178 for a more detailed explanation > + # We need both of these hacks to avoid compilation issues with modern > + # compilers. See 9ea3424a178 for a more detailed explanation. > + if cc.has_header('stdarg.h') > + conf.set('HAVE_STDARG_H', 1) > + endif Do we have any platforms which lack stdarg.h ? eg can be just add "#define HAVE_STDARG_H 1" unconditionally in the virsh code before it includes the readline headers ?