From b88843f6b212bb6a784ccb9f142d274c4e1bdbb0 Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Mon, 19 Dec 2022 15:26:40 +0100
Subject: [PATCH] include headers twice to check for header guards

---
 cmake/TestHeaders.cmake | 1 +
 1 file changed, 1 insertion(+)

diff --git a/cmake/TestHeaders.cmake b/cmake/TestHeaders.cmake
index 6ec30990..4731896c 100644
--- a/cmake/TestHeaders.cmake
+++ b/cmake/TestHeaders.cmake
@@ -115,6 +115,7 @@ function(add_header_test target)
         set(source "${CMAKE_CURRENT_BINARY_DIR}/headers/${directory}/${filename}.cpp")
         if(NOT EXISTS "${source}")
             file(WRITE "${source}" "#include <${header}>")
+            file(WRITE "${source}" "#include <${header}>") # do it twice to ensure that header guards are provided
         endif()
         list(APPEND sources "${source}")
     endforeach()