[libvirt] [PATCH v2] virsh: workaround readline prototypes warnings

[Roman Bogorodskiy]

When building with clang 4.0.0, virsh build fails like this:

gmake[3]: Entering directory '/usr/home/novel/code/libvirt/tools'
  CC       virsh-virsh.o
In file included from virsh.c:45:
In file included from /usr/local/include/readline/readline.h:31:
/usr/local/include/readline/rltypedefs.h:35:22: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
typedef int Function () __attribute__ ((deprecated));
                     ^
                      void
/usr/local/include/readline/rltypedefs.h:36:24: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
typedef void VFunction () __attribute__ ((deprecated));
                       ^
                        void
/usr/local/include/readline/rltypedefs.h:37:26: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
typedef char *CPFunction () __attribute__ ((deprecated));
                         ^
                          void
/usr/local/include/readline/rltypedefs.h:38:28: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
typedef char **CPPFunction () __attribute__ ((deprecated));
                           ^
                            void
In file included from virsh.c:45:
/usr/local/include/readline/readline.h:385:23: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
extern int rl_message ();
                      ^
                       void
5 errors generated.
gmake[3]: *** [Makefile:2823: virsh-virsh.o] Error 1

Fix that by adding -D_FUNCTION_DEF to READLINE_CFLAGS to fix *Function
related warnings and add a check for stdarg.h so readline headers
use proper rl_message declaration.

Bug report on the readline mailing list:

 http://lists.gnu.org/archive/html/bug-readline/2017-05/msg00004.html
---
 configure.ac        | 2 +-
 m4/virt-readline.m4 | 4 +++-
 tools/Makefile.am   | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 1af5538ee..1a73b3466 100644
--- a/configure.ac
+++ b/configure.ac
@@ -328,7 +328,7 @@ dnl Availability of various common headers (non-fatal if missing).
 AC_CHECK_HEADERS([pwd.h regex.h sys/un.h \
   sys/poll.h syslog.h mntent.h net/ethernet.h linux/magic.h \
   sys/un.h sys/syscall.h sys/sysctl.h netinet/tcp.h ifaddrs.h \
-  libtasn1.h sys/ucred.h sys/mount.h])
+  libtasn1.h sys/ucred.h sys/mount.h stdarg.h])
 dnl Check whether endian provides handy macros.
 AC_CHECK_DECLS([htole64], [], [], [[#include <endian.h>]])
 AC_CHECK_FUNCS([stat stat64 __xstat __xstat64 lstat lstat64 __lxstat __lxstat64])
diff --git a/m4/virt-readline.m4 b/m4/virt-readline.m4
index ee70ea36b..9fba5148a 100644
--- a/m4/virt-readline.m4
+++ b/m4/virt-readline.m4
@@ -45,7 +45,9 @@ AC_DEFUN([LIBVIRT_CHECK_READLINE],[
   # function, to ensure we aren't being confused by caching.
   LIBS=$lv_saved_libs
   AC_CHECK_LIB([readline], [rl_initialize],
-    [], [READLINE_LIBS="$READLINE_LIBS $extra_LIBS"])
+    [READLINE_CFLAGS="-D_FUNCTION_DEF $READLINE_CFLAGS"
+     AC_SUBST(READLINE_CFLAGS)],
+    [READLINE_LIBS="$READLINE_LIBS $extra_LIBS"])
   LIBS=$lv_saved_libs
 ])
 
diff --git a/tools/Makefile.am b/tools/Makefile.am
index 56691c289..345521457 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -244,7 +244,8 @@ virsh_CFLAGS =							\
 		$(WARN_CFLAGS)					\
 		$(PIE_CFLAGS)					\
 		$(COVERAGE_CFLAGS)				\
-		$(LIBXML_CFLAGS)
+		$(LIBXML_CFLAGS)				\
+		$(READLINE_CFLAGS)
 
 virt_admin_SOURCES =						\
 		virt-admin.c virt-admin.h			\
-- 
2.13.0