From c4cf70c96803424e57eed09938ef722f5daa56e6 Mon Sep 17 00:00:00 2001
From: Piotr Konopka <piotr.jan.konopka@cern.ch>
Date: Wed, 19 Mar 2025 16:16:00 +0100
Subject: [PATCH] [occ] bump OCC to c++20

Since the new abseil in https://github.com/alisw/alidist/pull/5793 exposes c++20 in headers, we have to bump accordingly.
---
 occ/CMakeLists.txt | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/occ/CMakeLists.txt b/occ/CMakeLists.txt
index 31ec6c78..81c89a57 100644
--- a/occ/CMakeLists.txt
+++ b/occ/CMakeLists.txt
@@ -103,11 +103,11 @@ project(occ
 ###
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_C_STANDARD 99)
 set(CMAKE_C_STANDARD_REQUIRED ON)
-set(CMAKE_CXX_EXTENSIONS OFF) #we want std=c++14, not std=gnu++14
+set(CMAKE_CXX_EXTENSIONS OFF) #we want std=c++20, not std=gnu++20
 
 if (CMAKE_COMPILER_IS_GNUCXX)
     if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4.9 OR
@@ -259,7 +259,7 @@ set_target_properties(${OCCLIBRARY} PROPERTIES
     SOVERSION ${OCC_VERSION_SHORT}
     PUBLIC_HEADER "${OCCLIBRARY_PUBLIC_HEADERS}")
 
-target_compile_features(${OCCLIBRARY} PUBLIC cxx_std_14)
+target_compile_features(${OCCLIBRARY} PUBLIC cxx_std_20)
 
 # Install library
 include(GNUInstallDirs)