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source: code/trunk/cmake/BuildConfigGCC.cmake @ 3343

Last change on this file since 3343 was 3196, checked in by rgrieder, 15 years ago

Merged pch branch back to trunk.

  • Property svn:eol-style set to native
File size: 3.5 KB
Line 
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# Shortcut for CMAKE_COMPILER_IS_GNUCXX and ..._GNUC
27SET(CMAKE_COMPILER_IS_GNU TRUE)
28
29# Determine compiler version
30EXEC_PROGRAM(
31  ${CMAKE_CXX_COMPILER}
32  ARGS ${CMAKE_CXX_COMPILER_ARG1} -dumpversion
33  OUTPUT_VARIABLE GCC_VERSION
34)
35
36# GCC may not support #pragma GCC system_header correctly when using
37# templates. According to Bugzilla, it was fixed March 07 but tests
38# have confirmed that GCC 4.0.0 does not pose a problem for our cases.
39INCLUDE(CompareVersionStrings)
40COMPARE_VERSION_STRINGS("${GCC_VERSION}" "4.0.0" _compare_result)
41IF(_compare_result LESS 0)
42  SET(GCC_NO_SYSTEM_HEADER_SUPPORT TRUE)
43ENDIF()
44
45# GCC only supports PCH in versions 3.4 and above
46INCLUDE(CompareVersionStrings)
47COMPARE_VERSION_STRINGS("${GCC_VERSION}" "3.4.0" _compare_result)
48IF(_compare_result GREATER -1)
49  SET(PCH_COMPILER_SUPPORT TRUE)
50ENDIF()
51
52# Also include environment flags. Could cause conflicts though
53SET_COMPILER_FLAGS("$ENV{CXXFLAGS}" CXX CACHE)
54SET_COMPILER_FLAGS("$ENV{CFLAGS}"   C   CACHE)
55
56# These flags get added to the flags above
57SET_COMPILER_FLAGS("    -g -ggdb -D_DEBUG" Debug          CACHE)
58SET_COMPILER_FLAGS("             -DNDEBUG" ReleaseAll     CACHE)
59ADD_COMPILER_FLAGS("-O3"                   Release        CACHE)
60ADD_COMPILER_FLAGS("-O2 -g -ggdb"          RelWithDebInfo CACHE)
61ADD_COMPILER_FLAGS("-Os"                   MinSizeRel     CACHE)
62
63# CMake doesn't seem to set the PIC flags right on certain 64 bit systems
64IF(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64")
65  ADD_COMPILER_FLAGS("-fPIC" CACHE)
66ENDIF()
67
68# We have some uncoformant code, disable an optimisation feature
69ADD_COMPILER_FLAGS("-fno-strict-aliasing" CACHE)
70
71# For GCC older than version 4, do not display sign compare warings
72# because of boost::filesystem (which creates about a hundred per include)
73ADD_COMPILER_FLAGS("-Wno-sign-compare" GCC_NO_SYSTEM_HEADER_SUPPORT CACHE)
74
75# For newer GCC (4.3 and above), don't display hundreds of annoying deprecated
76# messages. Other versions don't seem to show any such warnings at all.
77ADD_COMPILER_FLAGS("-Wno-deprecated" CXX CACHE)
78
79# Always show why a precompiled header file could not be used
80ADD_COMPILER_FLAGS("-Winvalid-pch" CXX CACHE)
81
82# Increase warning level if requested
83IF(EXTRA_COMPILER_WARNINGS)
84  ADD_COMPILER_FLAGS("-Wall -Wextra -Wno-unused-parameter" CACHE)
85ELSE()
86  REMOVE_COMPILER_FLAGS("-Wextra -Wno-unused-parameter" CACHE)
87  ADD_COMPILER_FLAGS("-Wall" CACHE)
88ENDIF()
89
90# General linker flags
91SET_LINKER_FLAGS("--no-undefined" CACHE)
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