make update_pch.sh aware of '#pragma once'

Headers are allowed to have one #if block that is not ignored,
on the assumption that it is the include guard. This shouldn't
be the case if the header uses #pragma once, obviously.

Change-Id: Ib0aa0933ce224ca4e3ecf209593852da0f4ca5ac
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/113799
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/bin/update_pch b/bin/update_pch
index 9b541d8a87a9..974d53ab9197 100755
--- a/bin/update_pch
+++ b/bin/update_pch
@@ -727,6 +727,12 @@ def process_source(root, module, filename, maxdepth=0):
                 else:
                     lastif = '#if'
                 del allowed_ifs[ ifdepth ]
+            elif line.startswith('#pragma once'):
+                # maxdepth == 1 means we are parsing a header file
+                # and are allowed one #ifdef block (the include guard),
+                # but in the #pragma once case do not allow that
+                assert maxdepth == 1
+                maxdepth = 0
             elif line.startswith('#include'):
                 if ifdepth - ifsallowed <= maxdepth:
                     line = sanitize(line)