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-rw-r--r--common.cmake20
1 files changed, 15 insertions, 5 deletions
diff --git a/common.cmake b/common.cmake
index c2527de..b1ea33e 100644
--- a/common.cmake
+++ b/common.cmake
@@ -48,11 +48,21 @@ if(parent_directory)
set(default_value OFF)
endif()
-set(CC_CXX_STANDARD "14" CACHE STRING "C++ standard version")
-option(CC_BEST_PRACTICES "Set common compiler options" "${default_value}")
-option(CC_WINDOWS_DEF "Define useful Windows macros" "${default_value}")
-option(CC_STATIC_RUNTIME "Link the runtime statically" "${default_value}")
-option(CC_STRIP_SYMBOLS "Strip debug symbols" "${default_value}")
+if(NOT DEFINED CC_CXX_STANDARD)
+ set(CC_CXX_STANDARD "14" CACHE STRING "C++ standard version")
+endif()
+if(NOT DEFINED CC_BEST_PRACTICES)
+ option(CC_BEST_PRACTICES "Set common compiler options" "${default_value}")
+endif()
+if(NOT DEFINED CC_WINDOWS_DEF)
+ option(CC_WINDOWS_DEF "Define useful Windows macros" "${default_value}")
+endif()
+if(NOT DEFINED CC_STATIC_RUNTIME)
+ option(CC_STATIC_RUNTIME "Link the runtime statically" "${default_value}")
+endif()
+if(NOT DEFINED CC_STRIP_SYMBOLS)
+ option(CC_STRIP_SYMBOLS "Strip debug symbols" "${default_value}")
+endif()
option(Boost_USE_STATIC_LIBS "Use the static Boost libraries" "${default_value}")
option(Boost_USE_STATIC_RUNTIME "Use Boost libraries linked to the runtime statically" "${CC_STATIC_RUNTIME}")