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source: code/trunk/cmake/CompilerConfigGCC.cmake @ 12012

Last change on this file since 12012 was 11071, checked in by landauf, 9 years ago

merged branch cpp11_v3 back to trunk

  • Property svn:eol-style set to native
File size: 4.7 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
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 ${CMAKE_CXX_COMPILER_ARG1} -dumpversion
37  OUTPUT_VARIABLE GCC_VERSION
38)
39
40# GCC only supports PCH in versions 3.4 and above
41INCLUDE(CompareVersionStrings)
42COMPARE_VERSION_STRINGS("${GCC_VERSION}" "3.4.0" _compare_result)
43IF(_compare_result GREATER -1)
44  SET(PCH_COMPILER_SUPPORT TRUE)
45ENDIF()
46
47# __COUNTER__ macro was only added in GCC 4.3
48# It might be required to make full build units work
49COMPARE_VERSION_STRINGS("${GCC_VERSION}" "4.3.0" _compare_result)
50IF(_compare_result GREATER -1)
51  SET(HAVE_COUNTER_MACRO TRUE)
52ENDIF()
53
54# Also include environment flags. Could cause conflicts though
55SET_COMPILER_FLAGS("$ENV{CXXFLAGS}" CXX CACHE)
56SET_COMPILER_FLAGS("$ENV{CFLAGS}"   C   CACHE)
57
58# These flags get added to the flags above
59SET_COMPILER_FLAGS("    -g -ggdb -D_DEBUG" Debug          CACHE)
60SET_COMPILER_FLAGS("             -DNDEBUG" ReleaseAll     CACHE)
61ADD_COMPILER_FLAGS("-O2 -g -ggdb"          RelForDevs     CACHE)
62ADD_COMPILER_FLAGS("-O3 -g -ggdb"          RelWithDebInfo CACHE)
63ADD_COMPILER_FLAGS("-O3"                   Release        CACHE)
64ADD_COMPILER_FLAGS("-Os"                   MinSizeRel     CACHE)
65
66# Introducing c++11
67ADD_COMPILER_FLAGS("-std=gnu++11" CACHE)
68
69# CMake doesn't seem to set the PIC flags right on certain 64 bit systems
70IF(NOT MINGW AND ${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64")
71  ADD_COMPILER_FLAGS("-fPIC" CACHE)
72ENDIF()
73
74# Never omit frame pointers that could interfere with proper stack traces
75ADD_COMPILER_FLAGS("-fno-omit-frame-pointer" CACHE)
76
77# Enable non standard floating point optimisations
78ADD_COMPILER_FLAGS("-ffast-math" CACHE)
79
80# Use SSE if possible
81# Commented because this might not work for cross compiling
82#CHECK_CXX_COMPILER_FLAG(-msse _gcc_have_sse)
83#IF(_gcc_have_sse)
84#  ADD_COMPILER_FLAGS("-msse" CACHE)
85#ENDIF()
86
87IF(NOT MINGW)
88  # Have GCC visibility?
89  CHECK_CXX_COMPILER_FLAG("-fvisibility=hidden" _gcc_have_visibility)
90  IF(_gcc_have_visibility)
91    # Note: There is a possible bug with the flag in gcc < 4.2 and Debug versions
92    COMPARE_VERSION_STRINGS("${GCC_VERSION}" "4.2.0" _compare_result)
93    IF(NOT CMAKE_BUILD_TYPE STREQUAL "Debug" OR _compare_result GREATER -1)
94      ADD_COMPILER_FLAGS("-DORXONOX_GCC_VISIBILITY -fvisibility=default -fvisibility-inlines-hidden" CACHE)
95    ENDIF()
96  ENDIF(_gcc_have_visibility)
97ENDIF()
98
99# We have some unconformant code, disable an optimisation feature
100ADD_COMPILER_FLAGS("-fno-strict-aliasing" CACHE)
101
102# For newer GCC (4.3 and above), don't display hundreds of annoying deprecated
103# messages. Other versions don't seem to show any such warnings at all.
104ADD_COMPILER_FLAGS("-Wno-deprecated" CXX CACHE)
105
106# Since GCC 4.8 -Wall includes -Wunused-local-typedefs which triggers lots of warnings
107# in Boost headers, hence we disable it
108ADD_COMPILER_FLAGS("-Wno-unused-local-typedefs" CXX CACHE)
109
110# Always show why a precompiled header file could not be used
111ADD_COMPILER_FLAGS("-Winvalid-pch" CXX CACHE)
112
113# Increase warning level if requested
114IF(EXTRA_COMPILER_WARNINGS)
115  ADD_COMPILER_FLAGS("-Wall -Wextra -Wno-unused-parameter" CACHE)
116ELSE()
117  REMOVE_COMPILER_FLAGS("-Wextra -Wno-unused-parameter" CACHE)
118  ADD_COMPILER_FLAGS("-Wall" CACHE)
119ENDIF()
120
121# Linker flags
122IF(LINUX)
123  # Don't allow undefined symbols in a shared library
124  SET_LINKER_FLAGS("-Wl,--no-undefined" CACHE)
125ENDIF()
126
127# Add compiler and linker flags for MinGW
128IF (MINGW)
129  ADD_COMPILER_FLAGS("-gstabs+" Debug RelForDevs RelWithDebInfo CACHE)
130
131  ADD_LINKER_FLAGS("-Wl,--enable-auto-import" CACHE)
132ENDIF()
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