build-sys: better test for pkg-config/pkg.m4

[elogind.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index 044dc6febb708221b218d072217234e383a502b9..7d73ed27b2e1157fed220e6a66f6ed60b3543752 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -49,6 +49,8 @@ AC_SEARCH_LIBS([clock_gettime], [rt], [], [AC_MSG_ERROR([*** POSIX RT library no
 AC_SEARCH_LIBS([cap_init], [cap], [], [AC_MSG_ERROR([*** POSIX caps library not found])])
 AC_CHECK_HEADERS([sys/capability.h], [], [AC_MSG_ERROR([*** POSIX caps headers not found])])
 
+# This makes sure pkg.m4 is available.
+m4_pattern_forbid([^_?PKG_[A-Z_]+$],[pkg.m4 missing, please install pkg-config])
 PKG_CHECK_MODULES(UDEV, [ libudev ])
 AC_SUBST(UDEV_CFLAGS)
 AC_SUBST(UDEV_LIBS)
@@ -65,7 +67,23 @@ PKG_CHECK_MODULES(GTK, [ gtk+-2.0 ])
 AC_SUBST(GTK_CFLAGS)
 AC_SUBST(GTK_LIBS)
 
-PKG_CHECK_MODULES(CGROUP, [ libcgroup ])
+PKG_CHECK_MODULES( CGROUP, [ libcgroup >= 0.35 ], [],
+    [AC_CHECK_HEADER( [libcgroup.h], [], [AC_MSG_ERROR([*** libcgroup.h not found])], )
+     save_CPPFLAGS="$CPPFLAGS"
+     save_LIBS="$LIBS"
+     CGROUP_LIBS=${CGROUP_LIBS:--lcgroup}
+     LIBS="$LIBS $CGROUP_LIBS"
+     CPPFLAGS="$CPPFLAGS $CGROUP_CFLAGS"
+     AC_MSG_CHECKING([for libcgroup >= 0.35])
+     AC_LINK_IFELSE(
+         [AC_LANG_PROGRAM([[#include <libcgroup.h>]], [[ CGFLAG_DELETE_RECURSIVE; cgroup_init(); ]])],
+         [AC_MSG_RESULT([yes])],
+         [AC_MSG_RESULT([no]); AC_MSG_ERROR([*** systemd needs libcgroup 0.35 or newer])],
+         [${CGROUP_LIBS}])
+     CPPFLAGS="$save_CPPFLAGS"
+     LIBS="$save_LIBS"
+    ])
+
 AC_SUBST(CGROUP_CFLAGS)
 AC_SUBST(CGROUP_LIBS)