From f054ceeab8ae78608e807ea559c04811b48e68c0 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: Tue, 5 Apr 2022 17:02:39 +0300
Subject: [PATCH] mdbx-cmake: add linking with `stdc++fs` for LCC < 1.26

---
 CMakeLists.txt       | 4 ++--
 cmake/compiler.cmake | 8 ++++++--
 test/CMakeLists.txt  | 4 ++++
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 919eb57f..9673c956 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -612,8 +612,8 @@ macro(libmdbx_setup_libs TARGET MODE)
   elseif(${CMAKE_SYSTEM_NAME} STREQUAL "Android")
     target_link_libraries(${TARGET} ${MODE} log)
   endif()
-  if(MDBX_CXX_STANDARD GREATER_EQUAL 17 AND LIBCXX_FILESYSTEM AND MDBX_BUILD_CXX)
-    target_link_libraries(${TARGET} ${MODE} ${LIBCXX_FILESYSTEM})
+  if(LIBCXX_FILESYSTEM AND MDBX_BUILD_CXX)
+    target_link_libraries(${TARGET} PUBLIC ${LIBCXX_FILESYSTEM})
   endif()
 endmacro()
 
diff --git a/cmake/compiler.cmake b/cmake/compiler.cmake
index 8e310cbb..c00ded41 100644
--- a/cmake/compiler.cmake
+++ b/cmake/compiler.cmake
@@ -823,9 +823,13 @@ macro(setup_compile_flags)
 endmacro(setup_compile_flags)
 
 if(CMAKE_CXX_COMPILER_LOADED)
-  # determine library for for std::filesystem
+  # determine library for std::filesystem
   set(LIBCXX_FILESYSTEM "")
-  if(CMAKE_COMPILER_IS_CLANG)
+  if(CMAKE_COMPILER_IS_ELBRUSCXX)
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 1.26.0)
+      set(LIBCXX_FILESYSTEM "stdc++fs")
+    endif()
+  elseif(CMAKE_COMPILER_IS_CLANG)
     if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
       set(LIBCXX_FILESYSTEM "c++experimental")
     elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 82858066..fe397141 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -45,6 +45,10 @@ set_target_properties(mdbx_test PROPERTIES
   INTERPROCEDURAL_OPTIMIZATION $<BOOL:${INTERPROCEDURAL_OPTIMIZATION}>)
 target_setup_options(mdbx_test)
 
+if(NOT MDBX_BUILD_CXX AND LIBCXX_FILESYSTEM)
+  target_link_libraries(mdbx_test ${LIBCXX_FILESYSTEM})
+endif()
+
 target_link_libraries(mdbx_test ${TOOL_MDBX_LIB} ${LIB_MATH} ${CMAKE_THREAD_LIBS_INIT})
 if(${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
   target_link_libraries(mdbx_test winmm.lib)