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0027417: Coose a Better Default Release Optimization Parameter for MinGW-w64

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Forcing CMAKE_CXX_FLAGS_RELEASE to -O2 -DNDEBUG, if the compiler is MinGW-w64.

Switched to replacing optimization parameter instead of overwriting
CMAKE_CXX_FLAGS_RELEASE string
This commit is contained in:
Benjamin Bihler 2016-04-22 13:07:52 +03:00 committed by bugmaster
parent eaffb01e7e
commit a139a35380
1 changed files with 10 additions and 0 deletions
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10
adm/cmake/occt_defs_flags.cmake
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@ -108,6 +108,16 @@ elseif (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMP
endif()
if(MINGW)
# Set default release optimization option to O2 instead of O3, since in
# some OCCT related examples, this gives significantly smaller binaries
# at comparable performace with MinGW-w64.
string (REGEX MATCH "-O3" IS_O3_CXX "${CMAKE_CXX_FLAGS_RELEASE}")
if (IS_O3_CXX)
string (REGEX REPLACE "-O3" "-O2" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
else()
set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O2")
endif()
set (CMAKE_CXX_FLAGS "-std=gnu++0x ${CMAKE_CXX_FLAGS}")
add_definitions(-D_WIN32_WINNT=0x0501)
# workaround bugs in mingw with vtable export