build: added automated testing of our public headers

we generate test_headers.h, which includes all of our public headers,
and check it compiles

testsuite/headers/test_headers.c

@@ -0,0 +1,43 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Copyright (C) Andrew Tridgell		2011
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/*
+  this tests that all of our public headers will build
+ */
+
+#define _GNU_SOURCE 1
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <Python.h>
+
+/* pre-include some of the public headers to avoid ordering issues */
+#include "core/ntstatus.h"
+
+/* include all our public headers */
+#include "test_headers.h"
+
+int main(void)
+{
+	printf("All OK\n");
+	return 0;
+}

testsuite/headers/wscript_build

@@ -0,0 +1,34 @@
+import os
+from samba_utils import os_path_relpath
+
+def build_test_headers(task):
+    '''symlink a header in the build tree'''
+    tgt = task.outputs[0].bldpath(task.env)
+    f = open(tgt, mode='w')
+    f.write('/* generated header test */\n')
+    hlist = task.env.public_headers_list[:]
+    hlist.sort()
+    for h in hlist:
+        f.write('#include "%s"\n' % os.path.normpath(h))
+    f.close()
+
+relpath1 = os_path_relpath(bld.srcnode.abspath(), bld.curdir)
+public_headers = []
+for h in bld.env.public_headers_list:
+    public_headers.append(os.path.join(relpath1, bld.env.build_public_headers, h))
+
+bld.SAMBA_GENERATOR('test_headers.h',
+                    group='main',
+                    rule=build_test_headers,
+                    source=public_headers,
+                    target='test_headers.h')
+
+if bld.env.DEVELOPER_MODE:
+    bld.SAMBA_BINARY('test_headers',
+                     source='test_headers.c',
+                     includes="#include/public",
+                     pyembed=True,
+                     local_include=True,
+                     global_include=False,
+                     use_global_deps=False,
+                     install=False)

wscript_build

@@ -113,6 +113,8 @@ bld.RECURSE('libds/common')
 if bld.env.enable_s3build:
     bld.RECURSE('source3')
 
+bld.RECURSE('testsuite/headers')
+
 # install some extra empty directories
 bld.INSTALL_DIRS("", "${LOCKDIR} ${SYSCONFDIR} ${LOCKDIR} ${PIDDIR} ${LOCALSTATEDIR}/lib ${PRIVATEDIR}/smbd.tmp/messaging")