Explicitly suppress -Wimplicit-fallthrough for pdfium.

No behavior change since that warning isn't enabled anywhere yet, and
it's opt-in.  This is a prerequisite for
https://chromium-review.googlesource.com/c/chromium/src/+/895726

Bug: chromium:177475
Change-Id: I844455a19ed76b5deb0201a878576ab0d5418a71
Reviewed-on: https://pdfium-review.googlesource.com/24790
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 1323f2a838..79c9747edf 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -71,6 +71,10 @@ config("pdfium_common_config") {
     # Assume UTF-8 by default to avoid code page dependencies.
     cflags += [ "/utf-8" ]
   }
+  if (is_clang) {
+    # TODO(thakis): Consider enabling this, https://crbug.com/807632
+    cflags += [ "-Wno-implicit-fallthrough" ]
+  }
 }
 
 config("pdfium_core_config") {