set(CMAKE_JAVA_COMPILE_FLAGS "-Xlint")
endif()
+# Se the optimisation flags
+# NOTE, we should CMAKE_BUILD_TYPE for this
if(enable_compile_optimizations)
set(optCFLAGS "-O3 -funroll-loops -fno-strict-aliasing ")
- if(CMAKE_COMPILER_IS_GNUCC AND (NOT enable_model-checking))
- set(optCFLAGS "${optCFLAGS} -finline-functions ")
- if(WIN32)
- if (COMPILER_C_VERSION_MAJOR_MINOR STRGREATER "4.8")
+else()
+ set(optCFLAGS "-O0 ")
+endif()
+if(enable_compile_optimizations AND CMAKE_COMPILER_IS_GNUCC
+ AND (NOT enable_model-checking))
+ # This is redundant (already in -03):
+ set(optCFLAGS "${optCFLAGS} -finline-functions ")
+endif()
+
+# Configure LTO
+# TODO, provide an option to manually choose whether to use LTO
+# NOTE, cmake 3.0 has a INTERPROCEDURAL_OPTIMIZATION target
+# property for this (http://www.cmake.org/cmake/help/v3.0/prop_tgt/INTERPROCEDURAL_OPTIMIZATION.html)
+set(enable_lto OFF)
+if(enable_compile_optimizations
+ AND CMAKE_COMPILER_IS_GNUCC
+ AND (NOT enable_model-checking))
+ if(WIN32)
+ if (COMPILER_C_VERSION_MAJOR_MINOR STRGREATER "4.8")
# On windows, we need 4.8 or higher to enable lto because of http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50293
#
# We are experiencing assertion failures even with 4.8 on MinGW.
# Push the support forward: will see if 4.9 works when we test it.
- set(optCFLAGS "${optCFLAGS} -flto ")
- endif()
- else()
- # On non-windows, 4.6 is enough for that
- if(LINKER_VERSION STRGREATER "2.22")
- set(optCFLAGS "${optCFLAGS} -flto ")
- endif()
+ set(enable_lto ON)
endif()
+ elseif(LINKER_VERSION STRGREATER "2.22")
+ set(enable_lto ON)
+ endif()
+endif()
+if(enable_lto)
+ set(optCFLAGS "${optCFLAGS} -flto ")
+ # See https://gcc.gnu.org/wiki/LinkTimeOptimizationFAQ#ar.2C_nm_and_ranlib:
+ # "Since version 4.9 gcc produces slim object files that only contain
+ # the intermediate representation. In order to handle archives of
+ # these objects you have to use the gcc wrappers:
+ # gcc-ar, gcc-nm and gcc-ranlib."
+ if(${CMAKE_C_COMPILER_ID} STREQUAL "GNU"
+ AND COMPILER_C_VERSION_MAJOR_MINOR STRGREATER "4.8")
+ set (CMAKE_AR gcc-ar)
+ set (CMAKE_RANLIB gcc-ranlib)
endif()
-else()
- set(optCFLAGS "-O0 ")
endif()
if(enable_model-checking AND enable_compile_optimizations)