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source: code/branches/mac_osx/cmake/CompilerConfigGCC.cmake @ 7869

Last change on this file since 7869 was 7526, checked in by rgrieder, 14 years ago

Fixed GCC visibility: Default should be 'default', not 'hidden' for our project

  • Property svn:eol-style set to native
File size: 4.4 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
26INCLUDE(FlagUtilities)
27INCLUDE(CompareVersionStrings)
28INCLUDE(CheckCXXCompilerFlag)
29
30# Shortcut for CMAKE_COMPILER_IS_GNUCXX and ..._GNUC
31SET(CMAKE_COMPILER_IS_GNU TRUE)
32
33# Determine compiler version
34EXEC_PROGRAM(
35  ${CMAKE_CXX_COMPILER}
36  ARGS ${CMAKE_CXX_COMPILER_ARG1} -dumpversion
37  OUTPUT_VARIABLE GCC_VERSION
38)
39
40# GCC may not support #pragma GCC system_header correctly when using
41# templates. According to Bugzilla, it was fixed March 07 but tests
42# have confirmed that GCC 4.0.0 does not pose a problem for our cases.
43COMPARE_VERSION_STRINGS("${GCC_VERSION}" "4.0.0" _compare_result)
44IF(_compare_result LESS 0)
45  SET(GCC_NO_SYSTEM_HEADER_SUPPORT TRUE)
46ENDIF()
47
48# GCC only supports PCH in versions 3.4 and above
49INCLUDE(CompareVersionStrings)
50COMPARE_VERSION_STRINGS("${GCC_VERSION}" "3.4.0" _compare_result)
51IF(_compare_result GREATER -1)
52  SET(PCH_COMPILER_SUPPORT TRUE)
53ENDIF()
54
55# Also include environment flags. Could cause conflicts though
56SET_COMPILER_FLAGS("$ENV{CXXFLAGS}" CXX CACHE)
57SET_COMPILER_FLAGS("$ENV{CFLAGS}"   C   CACHE)
58
59# These flags get added to the flags above
60SET_COMPILER_FLAGS("    -g -ggdb -D_DEBUG" Debug          CACHE)
61SET_COMPILER_FLAGS("             -DNDEBUG" ReleaseAll     CACHE)
62ADD_COMPILER_FLAGS("-O3"                   Release        CACHE)
63ADD_COMPILER_FLAGS("-O2 -g -ggdb"          RelWithDebInfo CACHE)
64ADD_COMPILER_FLAGS("-Os"                   MinSizeRel     CACHE)
65
66# CMake doesn't seem to set the PIC flags right on certain 64 bit systems
67# Todo: MinGW too?
68IF(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64")
69  ADD_COMPILER_FLAGS("-fPIC" CACHE)
70ENDIF()
71
72# Use SSE if possible
73# Commented because this might not work for cross compiling
74#CHECK_CXX_COMPILER_FLAG(-msse _gcc_have_sse)
75#IF(_gcc_have_sse)
76#  ADD_COMPILER_FLAGS("-msse" CACHE)
77#ENDIF()
78
79IF(NOT MINGW)
80  # Have GCC visibility?
81  CHECK_CXX_COMPILER_FLAG("-fvisibility=hidden" _gcc_have_visibility)
82  IF(_gcc_have_visibility)
83    # Note: There is a possible bug with the flag in gcc < 4.2 and Debug versions
84    COMPARE_VERSION_STRINGS("${GCC_VERSION}" "4.2.0" _compare_result)
85    IF(NOT CMAKE_BUILD_TYPE STREQUAL "Debug" OR _compare_result GREATER -1)
86      ADD_COMPILER_FLAGS("-DORXONOX_GCC_VISIBILITY -fvisibility=default -fvisibility-inlines-hidden" CACHE)
87    ENDIF()
88  ENDIF(_gcc_have_visibility)
89ENDIF()
90
91# We have some unconformant code, disable an optimisation feature
92ADD_COMPILER_FLAGS("-fno-strict-aliasing" CACHE)
93
94# For GCC older than version 4, do not display sign compare warnings
95# because of boost::filesystem (which creates about a hundred per include)
96ADD_COMPILER_FLAGS("-Wno-sign-compare" GCC_NO_SYSTEM_HEADER_SUPPORT CACHE)
97
98# For newer GCC (4.3 and above), don't display hundreds of annoying deprecated
99# messages. Other versions don't seem to show any such warnings at all.
100ADD_COMPILER_FLAGS("-Wno-deprecated" CXX CACHE)
101
102# Always show why a precompiled header file could not be used
103ADD_COMPILER_FLAGS("-Winvalid-pch" CXX CACHE)
104
105# Increase warning level if requested
106IF(EXTRA_COMPILER_WARNINGS)
107  ADD_COMPILER_FLAGS("-Wall -Wextra -Wno-unused-parameter" CACHE)
108ELSE()
109  REMOVE_COMPILER_FLAGS("-Wextra -Wno-unused-parameter" CACHE)
110  ADD_COMPILER_FLAGS("-Wall" CACHE)
111ENDIF()
112
113# General linker flags
114SET_LINKER_FLAGS("--no-undefined" CACHE)
115
116# Add compiler and linker flags for MinGW
117IF (MINGW)
118  ADD_COMPILER_FLAGS("-gstabs+" Debug          CACHE)
119  ADD_COMPILER_FLAGS("-gstabs+" RelWithDebInfo CACHE)
120
121  ADD_LINKER_FLAGS("-enable-auto-import" CACHE)
122ENDIF()
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