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source: code/branches/usability/cmake/CompilerConfigGCC.cmake @ 8369

Last change on this file since 8369 was 7458, checked in by landauf, 14 years ago

added compiler flags that enhance the output of Dr. Mingw (a 'just in time' debugger for MinGW)

  • Property svn:eol-style set to native
File size: 4.0 KB
Line 
1 #
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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)
28
29# Shortcut for CMAKE_COMPILER_IS_GNUCXX and ..._GNUC
30SET(CMAKE_COMPILER_IS_GNU TRUE)
31
32# Determine compiler version
33EXEC_PROGRAM(
34  ${CMAKE_CXX_COMPILER}
35  ARGS ${CMAKE_CXX_COMPILER_ARG1} -dumpversion
36  OUTPUT_VARIABLE GCC_VERSION
37)
38
39# Complain about incompatibilities
40COMPARE_VERSION_STRINGS("${GCC_VERSION}" "4.4.0" _compare_result)
41IF(NOT _compare_result LESS 0)
42  IF(${Boost_VERSION} LESS 103700)
43    MESSAGE(STATUS "Warning: Boost versions earlier than 1.37 may not compile with GCC 4.4 or later!")
44  ENDIF()
45ENDIF()
46
47# GCC may not support #pragma GCC system_header correctly when using
48# templates. According to Bugzilla, it was fixed March 07 but tests
49# have confirmed that GCC 4.0.0 does not pose a problem for our cases.
50COMPARE_VERSION_STRINGS("${GCC_VERSION}" "4.0.0" _compare_result)
51IF(_compare_result LESS 0)
52  SET(GCC_NO_SYSTEM_HEADER_SUPPORT TRUE)
53ENDIF()
54
55# GCC only supports PCH in versions 3.4 and above
56INCLUDE(CompareVersionStrings)
57COMPARE_VERSION_STRINGS("${GCC_VERSION}" "3.4.0" _compare_result)
58IF(_compare_result GREATER -1)
59  SET(PCH_COMPILER_SUPPORT TRUE)
60ENDIF()
61
62# Also include environment flags. Could cause conflicts though
63SET_COMPILER_FLAGS("$ENV{CXXFLAGS}" CXX CACHE)
64SET_COMPILER_FLAGS("$ENV{CFLAGS}"   C   CACHE)
65
66# These flags get added to the flags above
67SET_COMPILER_FLAGS("    -g -ggdb -D_DEBUG" Debug          CACHE)
68SET_COMPILER_FLAGS("             -DNDEBUG" ReleaseAll     CACHE)
69ADD_COMPILER_FLAGS("-O3"                   Release        CACHE)
70ADD_COMPILER_FLAGS("-O2 -g -ggdb"          RelWithDebInfo CACHE)
71ADD_COMPILER_FLAGS("-Os"                   MinSizeRel     CACHE)
72
73# CMake doesn't seem to set the PIC flags right on certain 64 bit systems
74IF(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64")
75  ADD_COMPILER_FLAGS("-fPIC" CACHE)
76ENDIF()
77
78# We have some unconformant code, disable an optimisation feature
79ADD_COMPILER_FLAGS("-fno-strict-aliasing" CACHE)
80
81# For GCC older than version 4, do not display sign compare warnings
82# because of boost::filesystem (which creates about a hundred per include)
83ADD_COMPILER_FLAGS("-Wno-sign-compare" GCC_NO_SYSTEM_HEADER_SUPPORT CACHE)
84
85# For newer GCC (4.3 and above), don't display hundreds of annoying deprecated
86# messages. Other versions don't seem to show any such warnings at all.
87ADD_COMPILER_FLAGS("-Wno-deprecated" CXX CACHE)
88
89# Always show why a precompiled header file could not be used
90ADD_COMPILER_FLAGS("-Winvalid-pch" CXX CACHE)
91
92# Increase warning level if requested
93IF(EXTRA_COMPILER_WARNINGS)
94  ADD_COMPILER_FLAGS("-Wall -Wextra -Wno-unused-parameter" CACHE)
95ELSE()
96  REMOVE_COMPILER_FLAGS("-Wextra -Wno-unused-parameter" CACHE)
97  ADD_COMPILER_FLAGS("-Wall" CACHE)
98ENDIF()
99
100# General linker flags
101SET_LINKER_FLAGS("--no-undefined" CACHE)
102
103# Add compiler and linker flags for MinGW
104IF (MINGW)
105  ADD_COMPILER_FLAGS("-gstabs+" Debug          CACHE)
106  ADD_COMPILER_FLAGS("-gstabs+" RelWithDebInfo CACHE)
107
108  ADD_LINKER_FLAGS("-enable-auto-import" CACHE)
109ENDIF()
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