cmake: try to use link-time optimizations (otland#2220)

Herwi · Jan 2, 2018 · bdd4870 · bdd4870
1 parent 76ffcee
commit bdd4870
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diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -16,6 +16,7 @@ if (CMAKE_COMPILER_IS_GNUCXX)
 endif()
 
 include(FindCXX11)
+include(FindLTO)
 
 # Find packages.
 find_package(GMP REQUIRED)

diff --git a/cmake/FindLTO.cmake b/cmake/FindLTO.cmake
@@ -0,0 +1,12 @@
+if(__FIND_LTO_CMAKE__)
+    return()
+endif()
+set(__FIND_LTO_CMAKE__ TRUE)
+
+include(CheckCXXCompilerFlag)
+enable_language(CXX)
+
+check_cxx_compiler_flag("-flto" COMPILER_KNOWS_LTO)
+if(COMPILER_KNOWS_LTO)
+    add_compile_options(-flto)
+endif()