From 42f1abd7e917ca56de2faed1c8b7e190294ccbb7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9B=D0=B5=D0=BE=D0=BD=D0=B8=D0=B4=20=D0=AE=D1=80=D1=8C?=
 =?UTF-8?q?=D0=B5=D0=B2=20=28Leonid=20Yuriev=29?= <leo@yuriev.ru>
Date: Fri, 22 Apr 2022 23:03:58 +0300
Subject: [PATCH] mdbx-cmake: fix/refine `--allow-multiple-definition` as
 workaround for `std::filesystem` and LCC < 1.25.23

---
 CMakeLists.txt       |  2 +-
 cmake/compiler.cmake | 13 +++++++++++++
 test/CMakeLists.txt  |  2 +-
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 56a89392..2ddc192b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -621,7 +621,7 @@ macro(libmdbx_setup_libs TARGET MODE)
     target_link_libraries(${TARGET} ${MODE} log)
   endif()
   if(LIBCXX_FILESYSTEM AND MDBX_BUILD_CXX)
-    if(CMAKE_COMPILER_IS_ELBRUSCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 1.26.0
+    if(CMAKE_COMPILER_IS_ELBRUSCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 1.25.23
         AND NOT CMAKE_VERSION VERSION_LESS 3.13)
       target_link_options(${TARGET} PUBLIC "-Wl,--allow-multiple-definition")
     endif()
diff --git a/cmake/compiler.cmake b/cmake/compiler.cmake
index c893867d..17c468b7 100644
--- a/cmake/compiler.cmake
+++ b/cmake/compiler.cmake
@@ -913,6 +913,8 @@ macro(probe_libcxx_filesystem)
       include(CheckCXXSourceCompiles)
       cmake_push_check_state()
       set(stdfs_probe_save_libraries ${CMAKE_REQUIRED_LIBRARIES})
+      set(stdfs_probe_save_flags ${CMAKE_REQUIRED_FLAGS})
+      set(stdfs_probe_save_link_options ${CMAKE_REQUIRED_LINK_OPTIONS})
       unset(stdfs_probe_clear_cxx_standard)
       if(NOT DEFINED CMAKE_CXX_STANDARD)
         list(FIND CMAKE_CXX_COMPILE_FEATURES cxx_std_14 HAS_CXX14)
@@ -927,6 +929,13 @@ macro(probe_libcxx_filesystem)
         endif()
         set(stdfs_probe_clear_cxx_standard ON)
       endif()
+      if(CMAKE_COMPILER_IS_ELBRUSCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 1.25.23)
+        if(CMAKE_VERSION VERSION_LESS 3.14)
+          set(CMAKE_REQUIRED_FLAGS ${stdfs_probe_save_flags} "-Wl,--allow-multiple-definition")
+        else()
+          set(CMAKE_REQUIRED_LINK_OPTIONS ${stdfs_probe_save_link_options} "-Wl,--allow-multiple-definition")
+        endif()
+      endif()
 
       set(stdfs_probe_code [[
         #if defined(__SIZEOF_INT128__) && !defined(__GLIBCXX_TYPE_INT_N_0) && defined(__clang__) && __clang_major__ < 4
@@ -994,11 +1003,15 @@ macro(probe_libcxx_filesystem)
         endif()
       endif()
 
+      set(CMAKE_REQUIRED_LINK_OPTIONS ${stdfs_probe_save_link_options})
+      set(CMAKE_REQUIRED_FLAGS ${stdfs_probe_save_flags})
       set(CMAKE_REQUIRED_LIBRARIES ${stdfs_probe_save_libraries})
       if(stdfs_probe_clear_cxx_standard)
         unset(CMAKE_CXX_STANDARD)
       endif()
       unset(stdfs_probe_clear_cxx_standard)
+      unset(stdfs_probe_save_link_options)
+      unset(stdfs_probe_save_flags)
       unset(stdfs_probe_save_libraries)
       unset(stdfs_probe_code)
       unset(stdfs_probe_rc)
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index d3f3b38e..5e7066e1 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -47,7 +47,7 @@ set_target_properties(mdbx_test PROPERTIES
 target_setup_options(mdbx_test)
 
 if(NOT MDBX_BUILD_CXX AND LIBCXX_FILESYSTEM)
-  if(CMAKE_COMPILER_IS_ELBRUSCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 1.26.0
+  if(CMAKE_COMPILER_IS_ELBRUSCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 1.25.23
       AND NOT CMAKE_VERSION VERSION_LESS 3.13)
     target_link_options(mdbx_test PRIVATE "-Wl,--allow-multiple-definition")
   endif()