From 5beadff4489b4e71246208f7c866ed4650d69d77 Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Thu, 13 Feb 2025 20:31:15 +0300
Subject: Require a C++17-compatible compiler.

---
 CMake/TdSetUpCompiler.cmake | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

(limited to 'CMake')

diff --git a/CMake/TdSetUpCompiler.cmake b/CMake/TdSetUpCompiler.cmake
index 747d0aaa7..be0b57ef5 100644
--- a/CMake/TdSetUpCompiler.cmake
+++ b/CMake/TdSetUpCompiler.cmake
@@ -1,4 +1,4 @@
-# Configures C++14 compiler, setting TDLib-specific compilation options.
+# Configures C++17 compiler, setting TDLib-specific compilation options.
 
 function(td_set_up_compiler)
   set(CMAKE_EXPORT_COMPILE_COMMANDS 1 PARENT_SCOPE)
@@ -24,22 +24,23 @@ function(td_set_up_compiler)
 
   if (GCC OR CLANG OR INTEL)
     if (WIN32 AND INTEL)
-      set(STD14_FLAG /Qstd=c++14)
+      set(STD17_FLAG /Qstd=c++17)
     else()
-      set(STD14_FLAG -std=c++14)
+      set(STD17_FLAG -std=c++17)
     endif()
-    check_cxx_compiler_flag(${STD14_FLAG} HAVE_STD14)
-    if (NOT HAVE_STD14)
-      string(REPLACE "c++14" "c++1y" STD14_FLAG "${STD14_FLAG}")
-      check_cxx_compiler_flag(${STD14_FLAG} HAVE_STD1Y)
-      set(HAVE_STD14 ${HAVE_STD1Y})
+    if (GCC AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.0))
+      message(FATAL_ERROR "No C++17 support in the compiler. Please upgrade the compiler to at least GCC 7.0.")
     endif()
+    if (CLANG AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0))
+      message(FATAL_ERROR "No C++17 support in the compiler. Please upgrade the compiler to at least clang 5.0.")
+    endif()
+    check_cxx_compiler_flag(${STD17_FLAG} HAVE_STD17)
   elseif (MSVC)
-    set(HAVE_STD14 MSVC_VERSION>=1900)
+    set(HAVE_STD17 MSVC_VERSION>=1914) # MSVC 2017 version 15.7
   endif()
 
-  if (NOT HAVE_STD14)
-    message(FATAL_ERROR "No C++14 support in the compiler. Please upgrade the compiler.")
+  if (NOT HAVE_STD17)
+    message(FATAL_ERROR "No C++17 support in the compiler. Please upgrade the compiler.")
   endif()
 
   if (MSVC)
@@ -49,7 +50,7 @@ function(td_set_up_compiler)
     add_definitions(-D_SCL_SECURE_NO_WARNINGS -D_CRT_SECURE_NO_WARNINGS)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /utf-8 /GR- /W4 /wd4100 /wd4127 /wd4324 /wd4505 /wd4814 /wd4702 /bigobj")
   elseif (CLANG OR GCC)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${STD14_FLAG} -fno-omit-frame-pointer -fno-exceptions -fno-rtti")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${STD17_FLAG} -fno-omit-frame-pointer -fno-exceptions -fno-rtti")
     if (APPLE)
       set(TD_LINKER_FLAGS "-Wl,-dead_strip")
       if (NOT CMAKE_BUILD_TYPE MATCHES "Deb")
@@ -77,7 +78,7 @@ function(td_set_up_compiler)
       endif()
     endif()
   elseif (INTEL)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${STD14_FLAG}")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${STD17_FLAG}")
   endif()
 
   if (WIN32)
@@ -119,7 +120,7 @@ function(td_set_up_compiler)
     add_cxx_compiler_flag("-Wno-unused-parameter")
     add_cxx_compiler_flag("-Wconversion")
     add_cxx_compiler_flag("-Wno-sign-conversion")
-    add_cxx_compiler_flag("-Wc++14-compat-pedantic")
+    add_cxx_compiler_flag("-Wc++17-compat-pedantic")
     add_cxx_compiler_flag("-Wdeprecated")
     add_cxx_compiler_flag("-Wno-unused-command-line-argument")
     add_cxx_compiler_flag("-Qunused-arguments")
-- 
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