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source: code/trunk/cmake/BuildConfigGCC.cmake @ 3177

Last change on this file since 3177 was 3111, checked in by rgrieder, 16 years ago

REMOVE_COMPILER_FLAGS makes no sense here. This fixes some gcc warning about unconformant code that may break due to optimisations.

  • Property svn:eol-style set to native
File size: 3.0 KB
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1 #
2 #             ORXONOX - the hottest 3D action shooter ever to exist
3 #                             > www.orxonox.net <
4 #
5 #        This program is free software; you can redistribute it and/or
6 #         modify it under the terms of the GNU General Public License
7 #        as published by the Free Software Foundation; either version 2
8 #            of the License, or (at your option) any later version.
9 #
10 #       This program is distributed in the hope that it will be useful,
11 #        but WITHOUT ANY WARRANTY; without even the implied warranty of
12 #        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 #                 GNU General Public License for more details.
14 #
15 #   You should have received a copy of the GNU General Public License along
16 #      with this program; if not, write to the Free Software Foundation,
17 #     Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
18 #
19 #
20 #  Author:
21 #    Reto Grieder, Adrian Friedli
22 #  Description:
23 #    Sets the right compiler and linker flags for GCC.
24 #
25
26# Determine compiler version
27EXEC_PROGRAM(
28  ${CMAKE_CXX_COMPILER}
29  ARGS ${CMAKE_CXX_COMPILER_ARG1} -dumpversion
30  OUTPUT_VARIABLE GCC_VERSION
31)
32
33# GCC may not support #pragma GCC system_header correctly when using
34# templates. According to Bugzilla, it was fixed March 07 but tests
35# have confirmed that GCC 4.0.0 does not pose a problem for our cases.
36INCLUDE(CompareVersionStrings)
37COMPARE_VERSION_STRINGS("${GCC_VERSION}" "4.0.0" _compare_result)
38IF(_compare_result LESS 0)
39  SET(GCC_NO_SYSTEM_HEADER_SUPPORT TRUE)
40ENDIF()
41
42# Also include environment flags. Could cause conflicts though
43SET_COMPILER_FLAGS("$ENV{CXXFLAGS}" CXX CACHE)
44SET_COMPILER_FLAGS("$ENV{CFLAGS}"   C   CACHE)
45
46# These flags get added to the flags above
47SET_COMPILER_FLAGS("    -g -ggdb -D_DEBUG" Debug          CACHE)
48SET_COMPILER_FLAGS("             -DNDEBUG" ReleaseAll     CACHE)
49ADD_COMPILER_FLAGS("-O3"                   Release        CACHE)
50ADD_COMPILER_FLAGS("-O2 -g -ggdb"          RelWithDebInfo CACHE)
51ADD_COMPILER_FLAGS("-Os"                   MinSizeRel     CACHE)
52
53# CMake doesn't seem to set the PIC flags right on certain 64 bit systems
54IF(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64")
55  ADD_COMPILER_FLAGS("-fPIC" CACHE)
56ENDIF()
57
58# We have some uncoformant code, disable an optimisation feature
59ADD_COMPILER_FLAGS("-fno-strict-aliasing" CACHE)
60
61# For GCC older than version 4, do not display sign compare warings
62# because of boost::filesystem (which creates about a hundred per include)
63ADD_COMPILER_FLAGS("-Wno-sign-compare" GCC_NO_SYSTEM_HEADER_SUPPORT CACHE)
64
65# For newer GCC (4.3 and above), don't display hundreds of annoying deprecated
66# messages. Other versions don't seem to show any such warnings at all.
67ADD_COMPILER_FLAGS("-Wno-deprecated" CXX CACHE)
68
69# Increase warning level if requested
70IF(EXTRA_COMPILER_WARNINGS)
71  ADD_COMPILER_FLAGS("-Wall -Wextra -Wno-unused-parameter" CACHE)
72ELSE()
73  REMOVE_COMPILER_FLAGS("-Wextra -Wno-unused-parameter" CACHE)
74  ADD_COMPILER_FLAGS("-Wall" CACHE)
75ENDIF()
76
77# General linker flags
78SET_LINKER_FLAGS("--no-undefined" CACHE)
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