s4-waf: support the use of system libraries

distros can set --bundled-libraries=NONE to force use of all system
libraries. If the right version isn't found then configure will fail.

Users may choose which libraries to use from the system, and which to
use bundled libs. The default is to try system libs, and use them if
their version matches the one in the source tree.

1 files changed, 15 insertions, 0 deletions

diff --git a/buildtools/wafsamba/samba_bundled.py b/buildtools/wafsamba/samba_bundled.py
index d4dbe221db..2a6d75f7c9 100644
--- a/buildtools/wafsamba/samba_bundled.py
+++ b/buildtools/wafsamba/samba_bundled.py
@@ -40,3 +40,18 @@ def BUNDLED_EXTENSION_DEFAULT(opt, extension, noextenion=''):
     Options.options['BUNDLED_EXTENSION_DEFAULT'] = extension
     Options.options['BUNDLED_EXTENSION_EXCEPTION'] = noextenion
 Options.Handler.BUNDLED_EXTENSION_DEFAULT = BUNDLED_EXTENSION_DEFAULT
+
+
+@conf
+def CHECK_BUNDLED_SYSTEM(conf, libname, minversion='0.0.0'):
+    if 'ALL' in conf.env.BUNDLED_LIBS or libname in conf.env.BUNDLED_LIBS:
+        return False
+    if conf.check_cfg(package=libname,
+                      args='"%s >= %s" --cflags --libs' % (libname, minversion),
+                      msg='Checking for system %s >= %s' % (libname, minversion)):
+        conf.SET_TARGET_TYPE(libname, 'SYSLIB')
+        return True
+    if 'NONE' in conf.env.BUNDLED_LIBS or '!'+libname in conf.env.BUNDLED_LIBS:
+        print('ERROR: System library %s of version %s not found, and bundling disabled' % (libname, minversion))
+        sys.exit(1)
+    return False