pw_bluetooth_sapphire: Handle zero length warning with pigweed

Handle zero length array warning with pigweed diagnostics.

Bug: b/355511476
Test: fx test //src/connectivity/bluetooth/core/bt-host

Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1095795
GitOrigin-RevId: 025e09d905c8c85be80d2aa26596dcfd7cafc289
Change-Id: I5512c7a744a28d3ac027682d16b1d3b973aa5035
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/230536
Lint: Lint 🤖 <[email protected]>
Commit-Queue: Jason Graffius <[email protected]>
Reviewed-by: Josh Conner <[email protected]>

pw_bluetooth_sapphire/host/common/packet_view_test.cc

@@ -17,11 +17,10 @@
 #include <string>
 
 #include "pw_bluetooth_sapphire/internal/host/common/byte_buffer.h"
+#include "pw_bluetooth_sapphire/internal/host/common/macros.h"
 #include "pw_bluetooth_sapphire/internal/host/testing/test_helpers.h"
 #include "pw_unit_test/framework.h"
 
-#pragma clang diagnostic ignored "-Wzero-length-array"
-
 namespace bt {
 namespace {
 
@@ -30,12 +29,15 @@ struct TestHeader {
   uint8_t field8;
 } __attribute__((packed));
 
+PW_MODIFY_DIAGNOSTICS_PUSH();
+PW_MODIFY_DIAGNOSTIC_CLANG(ignored, "-Wzero-length-array");
 struct TestPayload {
   uint8_t arg0;
   uint16_t arg1;
   uint8_t arg2[2];
   uint8_t arg3[0];
 } __attribute__((packed));
+PW_MODIFY_DIAGNOSTICS_POP();
 
 TEST(PacketViewTest, EmptyPayload) {
   constexpr size_t kBufferSize = sizeof(TestHeader);