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      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 
      5 include(AddLLVMDefinitions)
      6 include(CheckCCompilerFlag)
      7 include(CheckCXXCompilerFlag)
      8 
      9 if( CMAKE_COMPILER_IS_GNUCXX )
     10   set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
     11 elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
     12   set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
     13 endif()
     14 
     15 if( LLVM_ENABLE_ASSERTIONS )
     16   # MSVC doesn't like _DEBUG on release builds. See PR 4379.
     17   if( NOT MSVC )
     18     add_definitions( -D_DEBUG )
     19   endif()
     20   # On Release builds cmake automatically defines NDEBUG, so we
     21   # explicitly undefine it:
     22   if( uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
     23     add_definitions( -UNDEBUG )
     24   endif()
     25 else()
     26   if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
     27     if( NOT MSVC_IDE AND NOT XCODE )
     28       add_definitions( -DNDEBUG )
     29     endif()
     30   endif()
     31 endif()
     32 
     33 if(WIN32)
     34   if(CYGWIN)
     35     set(LLVM_ON_WIN32 0)
     36     set(LLVM_ON_UNIX 1)
     37   else(CYGWIN)
     38     set(LLVM_ON_WIN32 1)
     39     set(LLVM_ON_UNIX 0)
     40   endif(CYGWIN)
     41   set(LTDL_SHLIB_EXT ".dll")
     42   set(EXEEXT ".exe")
     43   # Maximum path length is 160 for non-unicode paths
     44   set(MAXPATHLEN 160)
     45 else(WIN32)
     46   if(UNIX)
     47     set(LLVM_ON_WIN32 0)
     48     set(LLVM_ON_UNIX 1)
     49     if(APPLE)
     50       set(LTDL_SHLIB_EXT ".dylib")
     51     else(APPLE)
     52       set(LTDL_SHLIB_EXT ".so")
     53     endif(APPLE)
     54     set(EXEEXT "")
     55     # FIXME: Maximum path length is currently set to 'safe' fixed value
     56     set(MAXPATHLEN 2024)
     57   else(UNIX)
     58     MESSAGE(SEND_ERROR "Unable to determine platform")
     59   endif(UNIX)
     60 endif(WIN32)
     61 
     62 function(add_flag_or_print_warning flag)
     63   check_c_compiler_flag(${flag} C_SUPPORTS_${flag})
     64   check_cxx_compiler_flag(${flag} CXX_SUPPORTS_${flag})
     65   if (C_SUPPORTS_${flag} AND CXX_SUPPORTS_${flag})
     66     message(STATUS "Building with ${flag}")
     67     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
     68     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
     69   else()
     70     message(WARNING "${flag} is not supported.")
     71   endif()
     72 endfunction()
     73 
     74 function(append_if variable value condition)
     75   if (${condition})
     76     set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
     77   endif()
     78 endfunction()
     79 
     80 if( LLVM_ENABLE_PIC )
     81   if( XCODE )
     82     # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
     83     # know how to disable this, so just force ENABLE_PIC off for now.
     84     message(WARNING "-fPIC not supported with Xcode.")
     85   elseif( WIN32 OR CYGWIN)
     86     # On Windows all code is PIC. MinGW warns if -fPIC is used.
     87   else()
     88     add_flag_or_print_warning("-fPIC")
     89 
     90     if( WIN32 OR CYGWIN)
     91       # MinGW warns if -fvisibility-inlines-hidden is used.
     92     else()
     93       check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
     94       append_if(CMAKE_CXX_FLAGS "-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
     95     endif()
     96   endif()
     97 endif()
     98 
     99 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
    100   # TODO: support other platforms and toolchains.
    101   if( LLVM_BUILD_32_BITS )
    102     message(STATUS "Building 32 bits executables and libraries.")
    103     add_llvm_definitions( -m32 )
    104     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
    105     set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
    106     set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
    107   endif( LLVM_BUILD_32_BITS )
    108 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
    109 
    110 # On Win32 using MS tools, provide an option to set the number of parallel jobs
    111 # to use.
    112 if( MSVC_IDE )
    113   set(LLVM_COMPILER_JOBS "0" CACHE STRING
    114     "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
    115   if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
    116     if( LLVM_COMPILER_JOBS STREQUAL "0" )
    117       add_llvm_definitions( /MP )
    118     else()
    119       if (MSVC10)
    120         message(FATAL_ERROR
    121           "Due to a bug in CMake only 0 and 1 is supported for "
    122           "LLVM_COMPILER_JOBS when generating for Visual Studio 2010")
    123       else()
    124         message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
    125         add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
    126       endif()
    127     endif()
    128   else()
    129     message(STATUS "Parallel compilation disabled")
    130   endif()
    131 endif()
    132 
    133 if( MSVC )
    134   include(ChooseMSVCCRT)
    135 
    136   if( MSVC11 )
    137     add_llvm_definitions(-D_VARIADIC_MAX=10)
    138   endif()
    139 
    140   # Add definitions that make MSVC much less annoying.
    141   add_llvm_definitions(
    142     # For some reason MS wants to deprecate a bunch of standard functions...
    143     -D_CRT_SECURE_NO_DEPRECATE
    144     -D_CRT_SECURE_NO_WARNINGS
    145     -D_CRT_NONSTDC_NO_DEPRECATE
    146     -D_CRT_NONSTDC_NO_WARNINGS
    147     -D_SCL_SECURE_NO_DEPRECATE
    148     -D_SCL_SECURE_NO_WARNINGS
    149 
    150     # Disabled warnings.
    151     -wd4065 # Suppress 'switch statement contains 'default' but no 'case' labels'
    152     -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
    153     -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
    154     -wd4181 # Suppress 'qualifier applied to reference type; ignored'
    155     -wd4224 # Suppress 'nonstandard extension used : formal parameter 'identifier' was previously defined as a type'
    156     -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
    157     -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
    158     -wd4275 # Suppress 'An exported class was derived from a class that was not exported.'
    159     -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
    160     -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
    161     -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
    162     -wd4355 # Suppress ''this' : used in base member initializer list'
    163     -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
    164     -wd4551 # Suppress 'function call missing argument list'
    165     -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
    166     -wd4715 # Suppress ''function' : not all control paths return a value'
    167     -wd4722 # Suppress ''function' : destructor never returns, potential memory leak'
    168     -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
    169 
    170     # Promoted warnings.
    171     -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
    172 
    173     # Promoted warnings to errors.
    174     -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
    175     )
    176 
    177   # Enable warnings
    178   if (LLVM_ENABLE_WARNINGS)
    179     add_llvm_definitions( /W4 )
    180     if (LLVM_ENABLE_PEDANTIC)
    181       # No MSVC equivalent available
    182     endif (LLVM_ENABLE_PEDANTIC)
    183   endif (LLVM_ENABLE_WARNINGS)
    184   if (LLVM_ENABLE_WERROR)
    185     add_llvm_definitions( /WX )
    186   endif (LLVM_ENABLE_WERROR)
    187 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
    188   if (LLVM_ENABLE_WARNINGS)
    189     add_llvm_definitions( -Wall -W -Wno-unused-parameter -Wwrite-strings )
    190 
    191     # Turn off missing field initializer warnings for gcc to avoid noise from
    192     # false positives with empty {}. Turn them on otherwise (they're off by
    193     # default for clang).
    194     check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
    195     if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
    196       if (CMAKE_COMPILER_IS_GNUCXX)
    197         add_llvm_definitions( -Wno-missing-field-initializers )
    198       else()
    199         add_llvm_definitions( -Wmissing-field-initializers )
    200       endif()
    201     endif()
    202 
    203     if (LLVM_ENABLE_PEDANTIC)
    204       add_llvm_definitions( -pedantic -Wno-long-long )
    205     endif (LLVM_ENABLE_PEDANTIC)
    206     check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
    207     append_if(CMAKE_CXX_FLAGS "-Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
    208     check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
    209     append_if(CMAKE_C_FLAGS "-Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
    210     append_if(CMAKE_CXX_FLAGS "-Wno-uninitialized" USE_NO_UNINITIALIZED)
    211     append_if(CMAKE_CXX_FLAGS "-Wno-maybe-uninitialized" USE_NO_MAYBE_UNINITIALIZED)
    212   endif (LLVM_ENABLE_WARNINGS)
    213   if (LLVM_ENABLE_WERROR)
    214     add_llvm_definitions( -Werror )
    215   endif (LLVM_ENABLE_WERROR)
    216 endif( MSVC )
    217 
    218 add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
    219 add_llvm_definitions( -D__STDC_FORMAT_MACROS )
    220 add_llvm_definitions( -D__STDC_LIMIT_MACROS )
    221