1# This CMake module is responsible for interpreting the user defined LLVM_
2# options and executing the appropriate CMake commands to realize the users'
3# selections.
4
5include(AddLLVMDefinitions)
6
7if( CMAKE_COMPILER_IS_GNUCXX )
8  set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
9elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
10  set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
11endif()
12
13# Run-time build mode; It is used for unittests.
14if(MSVC_IDE)
15  # Expect "$(Configuration)", "$(OutDir)", etc.
16  # It is expanded by msbuild or similar.
17  set(RUNTIME_BUILD_MODE "${CMAKE_CFG_INTDIR}")
18elseif(NOT CMAKE_BUILD_TYPE STREQUAL "")
19  # Expect "Release" "Debug", etc.
20  # Or unittests could not run.
21  set(RUNTIME_BUILD_MODE ${CMAKE_BUILD_TYPE})
22else()
23  # It might be "."
24  set(RUNTIME_BUILD_MODE "${CMAKE_CFG_INTDIR}")
25endif()
26
27if( LLVM_ENABLE_ASSERTIONS )
28  # MSVC doesn't like _DEBUG on release builds. See PR 4379.
29  if( NOT MSVC )
30    add_definitions( -D_DEBUG )
31  endif()
32  # On Release builds cmake automatically defines NDEBUG, so we
33  # explicitly undefine it:
34  if( uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
35    add_definitions( -UNDEBUG )
36  endif()
37else()
38  if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
39    if( NOT MSVC_IDE AND NOT XCODE )
40      add_definitions( -DNDEBUG )
41    endif()
42  endif()
43endif()
44
45if(WIN32)
46  if(CYGWIN)
47    set(LLVM_ON_WIN32 0)
48    set(LLVM_ON_UNIX 1)
49  else(CYGWIN)
50    set(LLVM_ON_WIN32 1)
51    set(LLVM_ON_UNIX 0)
52  endif(CYGWIN)
53  set(LTDL_SHLIB_EXT ".dll")
54  set(EXEEXT ".exe")
55  # Maximum path length is 160 for non-unicode paths
56  set(MAXPATHLEN 160)
57else(WIN32)
58  if(UNIX)
59    set(LLVM_ON_WIN32 0)
60    set(LLVM_ON_UNIX 1)
61    if(APPLE)
62      set(LTDL_SHLIB_EXT ".dylib")
63    else(APPLE)
64      set(LTDL_SHLIB_EXT ".so")
65    endif(APPLE)
66    set(EXEEXT "")
67    # FIXME: Maximum path length is currently set to 'safe' fixed value
68    set(MAXPATHLEN 2024)
69  else(UNIX)
70    MESSAGE(SEND_ERROR "Unable to determine platform")
71  endif(UNIX)
72endif(WIN32)
73
74if( LLVM_ENABLE_PIC )
75  if( XCODE )
76    # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
77    # know how to disable this, so just force ENABLE_PIC off for now.
78    message(WARNING "-fPIC not supported with Xcode.")
79  elseif( WIN32 OR CYGWIN)
80    # On Windows all code is PIC. MinGW warns if -fPIC is used.
81  else()
82    include(CheckCXXCompilerFlag)
83    check_cxx_compiler_flag("-fPIC" SUPPORTS_FPIC_FLAG)
84    if( SUPPORTS_FPIC_FLAG )
85      message(STATUS "Building with -fPIC")
86      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
87      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
88    else( SUPPORTS_FPIC_FLAG )
89      message(WARNING "-fPIC not supported.")
90    endif()
91
92    if( WIN32 OR CYGWIN)
93      # MinGW warns if -fvisibility-inlines-hidden is used.
94    else()
95      check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
96      if( SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG )
97        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility-inlines-hidden")
98      endif()
99     endif()
100  endif()
101endif()
102
103if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
104  # TODO: support other platforms and toolchains.
105  if( LLVM_BUILD_32_BITS )
106    message(STATUS "Building 32 bits executables and libraries.")
107    add_llvm_definitions( -m32 )
108    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
109    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
110    set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
111  endif( LLVM_BUILD_32_BITS )
112endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
113
114# On Win32 using MS tools, provide an option to set the number of parallel jobs
115# to use.
116if( MSVC_IDE )
117  set(LLVM_COMPILER_JOBS "0" CACHE STRING
118    "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
119  if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
120    if( LLVM_COMPILER_JOBS STREQUAL "0" )
121      add_llvm_definitions( /MP )
122    else()
123      if (MSVC10)
124        message(FATAL_ERROR
125          "Due to a bug in CMake only 0 and 1 is supported for "
126          "LLVM_COMPILER_JOBS when generating for Visual Studio 2010")
127      else()
128        message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
129        add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
130      endif()
131    endif()
132  else()
133    message(STATUS "Parallel compilation disabled")
134  endif()
135endif()
136
137if( MSVC )
138  include(ChooseMSVCCRT)
139
140  if( MSVC11 )
141    add_llvm_definitions(-D_VARIADIC_MAX=10)
142  endif()
143
144  # Add definitions that make MSVC much less annoying.
145  add_llvm_definitions(
146    # For some reason MS wants to deprecate a bunch of standard functions...
147    -D_CRT_SECURE_NO_DEPRECATE
148    -D_CRT_SECURE_NO_WARNINGS
149    -D_CRT_NONSTDC_NO_DEPRECATE
150    -D_CRT_NONSTDC_NO_WARNINGS
151    -D_SCL_SECURE_NO_DEPRECATE
152    -D_SCL_SECURE_NO_WARNINGS
153
154    # Disabled warnings.
155    -wd4065 # Suppress 'switch statement contains 'default' but no 'case' labels'
156    -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
157    -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
158    -wd4181 # Suppress 'qualifier applied to reference type; ignored'
159    -wd4224 # Suppress 'nonstandard extension used : formal parameter 'identifier' was previously defined as a type'
160    -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
161    -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
162    -wd4275 # Suppress 'An exported class was derived from a class that was not exported.'
163    -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
164    -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
165    -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
166    -wd4355 # Suppress ''this' : used in base member initializer list'
167    -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
168    -wd4551 # Suppress 'function call missing argument list'
169    -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
170    -wd4715 # Suppress ''function' : not all control paths return a value'
171    -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
172
173    # Promoted warnings.
174    -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
175
176    # Promoted warnings to errors.
177    -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
178    -we4239 # Promote 'nonstandard extension used : 'token' : conversion from 'type' to 'type'' to error.
179    )
180
181  # Enable warnings
182  if (LLVM_ENABLE_WARNINGS)
183    add_llvm_definitions( /W4 )
184    if (LLVM_ENABLE_PEDANTIC)
185      # No MSVC equivalent available
186    endif (LLVM_ENABLE_PEDANTIC)
187  endif (LLVM_ENABLE_WARNINGS)
188  if (LLVM_ENABLE_WERROR)
189    add_llvm_definitions( /WX )
190  endif (LLVM_ENABLE_WERROR)
191elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
192  if (LLVM_ENABLE_WARNINGS)
193    add_llvm_definitions( -Wall -W -Wno-unused-parameter -Wwrite-strings )
194    if (LLVM_ENABLE_PEDANTIC)
195      add_llvm_definitions( -pedantic -Wno-long-long )
196    endif (LLVM_ENABLE_PEDANTIC)
197    check_cxx_compiler_flag("-Werror -Wcovered-switch-default" SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
198    if( SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG )
199      add_llvm_definitions( -Wcovered-switch-default )
200    endif()
201  endif (LLVM_ENABLE_WARNINGS)
202  if (LLVM_ENABLE_WERROR)
203    add_llvm_definitions( -Werror )
204  endif (LLVM_ENABLE_WERROR)
205endif( MSVC )
206
207add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
208add_llvm_definitions( -D__STDC_FORMAT_MACROS )
209add_llvm_definitions( -D__STDC_LIMIT_MACROS )
210