diff --git a/flang/lib/Decimal/CMakeLists.txt b/flang/lib/Decimal/CMakeLists.txt
--- a/flang/lib/Decimal/CMakeLists.txt
+++ b/flang/lib/Decimal/CMakeLists.txt
@@ -36,6 +36,13 @@
     ${FLANG_SOURCE_DIR}/include)
 endif()
 
+check_cxx_compiler_flag(-fno-lto FLANG_RUNTIME_HAS_FNO_LTO_FLAG)
+if (FLANG_RUNTIME_HAS_FNO_LTO_FLAG)
+  append("-fno-lto" CMAKE_CXX_FLAGS)
+endif()
+
+
+
 add_flang_library(FortranDecimal INSTALL_WITH_TOOLCHAIN
   binary-to-decimal.cpp
   decimal-to-binary.cpp
diff --git a/flang/runtime/CMakeLists.txt b/flang/runtime/CMakeLists.txt
--- a/flang/runtime/CMakeLists.txt
+++ b/flang/runtime/CMakeLists.txt
@@ -65,6 +65,13 @@
   "
   HAVE_DECL_STRERROR_S)
 
+check_cxx_compiler_flag(-fno-lto FLANG_RUNTIME_HAS_FNO_LTO_FLAG)
+if (FLANG_RUNTIME_HAS_FNO_LTO_FLAG)
+  set(NO_LTO_FLAGS "-fno-lto")
+else()
+  set(NO_LTO_FLAGS "")
+endif()
+
 if (NOT (HAVE_STRERROR OR HAVE_STRERROR_R OR HAVE_DECL_STRERROR_S))
   message(FATAL_ERROR "None of strerror, strerror_r, strerror_s found.")
 endif()
@@ -75,6 +82,9 @@
 # with different names
 include_directories(AFTER ${CMAKE_CURRENT_BINARY_DIR})
 
+append(${NO_LTO_FLAGS} CMAKE_C_FLAGS)
+append(${NO_LTO_FLAGS} CMAKE_CXX_FLAGS)
+
 add_subdirectory(FortranMain)
 
 add_flang_library(FortranRuntime