From 5ca58eda09757118e8f847174d13bc3de59f614d Mon Sep 17 00:00:00 2001
From: Andrey Astafyev <dev@246060.ru>
Date: Thu, 22 Aug 2019 07:30:50 +0300
Subject: [PATCH] =?UTF-8?q?=D0=9D=D0=BE=D0=B2=D1=8B=D0=B9=20=D0=B2=D0=B0?=
 =?UTF-8?q?=D1=80=D0=B8=D0=B0=D0=BD=D1=82=20=D0=BE=D0=B1=D1=80=D0=B0=D0=B1?=
 =?UTF-8?q?=D0=BE=D1=82=D0=BA=D0=B8=20=D1=84=D0=BB=D0=B0=D0=B3=D0=B0=20-fl?=
 =?UTF-8?q?to?=
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Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 CMLibCompilerFlags.cmake | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/CMLibCompilerFlags.cmake b/CMLibCompilerFlags.cmake
index e060008..24db8a4 100644
--- a/CMLibCompilerFlags.cmake
+++ b/CMLibCompilerFlags.cmake
@@ -88,11 +88,26 @@ if(CMAKE_CXX_COMPILER_IS_CLANG
   endif()
 
   if(CMAKE_BUILD_TYPE STREQUAL "Release")
-    check_enable_cxx_flag(-flto)
-    if(CMAKE_CXX_COMPILER_IS_GCC
-       AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER "4.8")
-      # Doesn't work with GCC 4.7.2 in Astra Linux 1.5
-      check_enable_cxx_flag(-fno-fat-lto-objects)
+    check_cxx_compiler_flag(-flto CXX_HAS_LTO_FLAG)
+    check_cxx_compiler_flag(-fno-fat-lto-objects CXX_HAS_NO_FAT_LTO_FLAG)
+    if(CMAKE_CXX_COMPILER_IS_GCC AND CXX_HAS_LTO_FLAG)
+      find_program(CMAKE_GCC_AR NAMES ${_CMAKE_TOOLCHAIN_PREFIX}gcc-ar${_CMAKE_TOOLCHAIN_SUFFIX} HINTS ${_CMAKE_TOOLCHAIN_LOCATION})
+      find_program(CMAKE_GCC_NM NAMES ${_CMAKE_TOOLCHAIN_PREFIX}gcc-nm HINTS ${_CMAKE_TOOLCHAIN_LOCATION})
+      find_program(CMAKE_GCC_RANLIB NAMES ${_CMAKE_TOOLCHAIN_PREFIX}gcc-ranlib HINTS ${_CMAKE_TOOLCHAIN_LOCATION})
+      if(CMAKE_GCC_AR AND CMAKE_GCC_NM AND CMAKE_GCC_RANLIB)
+        set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -flto")
+        if(CXX_HAS_NO_FAT_LTO_FLAG)
+          set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -fno-fat-lto-objects")
+        endif()
+        set(CMAKE_AR "${CMAKE_GCC_AR}")
+        set(CMAKE_NM "${CMAKE_GCC_NM}")
+        set(CMAKE_RANLIB "${CMAKE_GCC_RANLIB}")
+      else()
+        message(WARNING "GCC indicates LTO support, but binutils wrappers could not be found. Disabling LTO.")
+      endif()
+    else()
+      check_enable_compiler_flag(-flto)
+      check_enable_compiler_flag(-fno-fat-lto-objects)
     endif()
   endif()
 endif()