From 2fb1acd74b530c9b1cfd77ff5fd29896960b8189 Mon Sep 17 00:00:00 2001
From: tamasmeszaros <meszaros.q@gmail.com>
Date: Fri, 7 Feb 2020 11:07:22 +0100
Subject: [PATCH] Add check for cereal library in CMake

Fixes #3547, replaces #3613
---
 CMakeLists.txt                 |  3 +--
 cmake/modules/Findcereal.cmake | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 2 deletions(-)
 create mode 100644 cmake/modules/Findcereal.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 878f2373e..e4e686645 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -392,8 +392,7 @@ if (NOT GLEW_FOUND)
 endif ()
 
 # Find the Cereal serialization library
-add_library(cereal INTERFACE)
-target_include_directories(cereal INTERFACE include)
+find_package(cereal REQUIRED)
 
 # l10n
 set(L10N_DIR "${SLIC3R_RESOURCES_DIR}/localization")
diff --git a/cmake/modules/Findcereal.cmake b/cmake/modules/Findcereal.cmake
new file mode 100644
index 000000000..b4829757e
--- /dev/null
+++ b/cmake/modules/Findcereal.cmake
@@ -0,0 +1,26 @@
+set(_q "")
+if(${CMAKE_FIND_PACKAGE_NAME}_FIND_QUIETLY)
+    set(_q QUIET)
+    set(_quietly TRUE)
+endif()
+find_package(${CMAKE_FIND_PACKAGE_NAME} ${${CMAKE_FIND_PACKAGE_NAME}_FIND_VERSION} CONFIG ${_q})
+
+if (NOT ${CMAKE_FIND_PACKAGE_NAME}_FOUND)
+    # Fall-back solution to find the Cereal serialization library header file
+    include(CheckIncludeFileCXX)
+    add_library(cereal INTERFACE)
+    target_include_directories(cereal INTERFACE include)
+
+    if (_quietly)
+        set(CMAKE_REQUIRED_QUIET ON)
+    endif()
+    CHECK_INCLUDE_FILE_CXX("cereal/cereal.hpp" HAVE_CEREAL_H)
+
+    if (NOT HAVE_CEREAL_H)
+        if (${CMAKE_FIND_PACKAGE_NAME}_FIND_REQUIRED)
+            message(FATAL_ERROR "Cereal library not found. Please install the dependency.")
+        elseif(NOT _quietly)
+            message(WARNING "Cereal library not found.")
+        endif()
+    endif ()
+endif()