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-rw-r--r--configure.cmake12
1 files changed, 12 insertions, 0 deletions
diff --git a/configure.cmake b/configure.cmake
new file mode 100644
index 0000000000..97b4bc6599
--- /dev/null
+++ b/configure.cmake
@@ -0,0 +1,12 @@
+include(CheckCXXSourceCompiles)
+
+# VC++ guarantees support for LTCG (LTO's equivalent)
+if(NOT WIN32)
+ # Function required to give CMAKE_REQUIRED_* local scope
+ function(check_have_lto)
+ set(CMAKE_REQUIRED_FLAGS -flto)
+ set(CMAKE_REQUIRED_LIBRARIES -flto -fuse-ld=gold)
+ check_cxx_source_compiles("int main() { return 0; }" HAVE_LTO)
+ endfunction(check_have_lto)
+ check_have_lto()
+endif(NOT WIN32)