| 1 | # |
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| 2 | # ORXONOX - the hottest 3D action shooter ever to exist |
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| 3 | # > www.orxonox.net < |
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| 4 | # |
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| 5 | # This program is free software; you can redistribute it and/or |
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| 6 | # modify it under the terms of the GNU General Public License |
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| 7 | # as published by the Free Software Foundation; either version 2 |
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| 8 | # of the License, or (at your option) any later version. |
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| 9 | # |
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| 10 | # This program is distributed in the hope that it will be useful, |
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| 11 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 13 | # GNU General Public License for more details. |
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| 14 | # |
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| 15 | # You should have received a copy of the GNU General Public License along |
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| 16 | # with this program; if not, write to the Free Software Foundation, |
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| 17 | # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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| 18 | # |
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| 19 | # |
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| 20 | # Author: |
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| 21 | # Reto Grieder, Adrian Friedli |
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| 22 | # Description: |
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| 23 | # Sets the right compiler and linker flags for GCC. |
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| 24 | # |
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| 25 | |
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| 26 | # Determine compiler version |
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| 27 | EXEC_PROGRAM( |
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| 28 | ${CMAKE_CXX_COMPILER} |
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| 29 | ARGS ${CMAKE_CXX_COMPILER_ARG1} -dumpversion |
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| 30 | OUTPUT_VARIABLE GCC_VERSION |
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| 31 | ) |
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| 32 | |
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| 33 | # GCC may not support #pragma GCC system_header correctly when using |
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| 34 | # templates. According to Bugzilla, it was fixed March 07 but tests |
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| 35 | # have confirmed that GCC 4.0.0 does not pose a problem for our cases. |
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| 36 | INCLUDE(CompareVersionStrings) |
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| 37 | COMPARE_VERSION_STRINGS("${GCC_VERSION}" "4.0.0" _compare_result) |
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| 38 | IF(_compare_result LESS 0) |
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| 39 | SET(GCC_NO_SYSTEM_HEADER_SUPPORT TRUE) |
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| 40 | ENDIF() |
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| 41 | |
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| 42 | # Also include environment flags. Could cause conflicts though |
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| 43 | SET_COMPILER_FLAGS("$ENV{CXXFLAGS}" CXX CACHE) |
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| 44 | SET_COMPILER_FLAGS("$ENV{CFLAGS}" C CACHE) |
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| 45 | |
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| 46 | # These flags get added to the flags above |
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| 47 | SET_COMPILER_FLAGS(" -g -ggdb -D_DEBUG" Debug CACHE) |
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| 48 | SET_COMPILER_FLAGS(" -DNDEBUG" ReleaseAll CACHE) |
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| 49 | ADD_COMPILER_FLAGS("-O3" Release CACHE) |
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| 50 | ADD_COMPILER_FLAGS("-O2 -g -ggdb" RelWithDebInfo CACHE) |
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| 51 | ADD_COMPILER_FLAGS("-Os" MinSizeRel CACHE) |
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| 52 | |
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| 53 | # CMake doesn't seem to set the PIC flags right on certain 64 bit systems |
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| 54 | IF(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64") |
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| 55 | ADD_COMPILER_FLAGS("-fPIC" CACHE) |
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| 56 | ENDIF() |
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| 57 | |
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| 58 | # We have some uncoformant code, disable an optimisation feature |
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| 59 | ADD_COMPILER_FLAGS("-fno-strict-aliasing" CACHE) |
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| 60 | |
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| 61 | # For GCC older than version 4, do not display sign compare warings |
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| 62 | # because of boost::filesystem (which creates about a hundred per include) |
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| 63 | ADD_COMPILER_FLAGS("-Wno-sign-compare" GCC_NO_SYSTEM_HEADER_SUPPORT CACHE) |
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| 64 | |
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| 65 | # For newer GCC (4.3 and above), don't display hundreds of annoying deprecated |
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| 66 | # messages. Other versions don't seem to show any such warnings at all. |
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| 67 | ADD_COMPILER_FLAGS("-Wno-deprecated" CXX CACHE) |
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| 68 | |
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| 69 | # Increase warning level if requested |
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| 70 | IF(EXTRA_COMPILER_WARNINGS) |
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| 71 | ADD_COMPILER_FLAGS("-Wall -Wextra -Wno-unused-parameter" CACHE) |
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| 72 | ELSE() |
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| 73 | REMOVE_COMPILER_FLAGS("-Wextra -Wno-unused-parameter" CACHE) |
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| 74 | ADD_COMPILER_FLAGS("-Wall" CACHE) |
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| 75 | ENDIF() |
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| 76 | |
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| 77 | # General linker flags |
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| 78 | SET_LINKER_FLAGS("--no-undefined" CACHE) |
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