1# HandleLibcxxFlags - A set of macros used to setup the flags used to compile
2# and link libc++abi. These macros add flags to the following CMake variables.
3# - LIBCXXABI_COMPILE_FLAGS: flags used to compile libc++abi
4# - LIBCXXABI_LINK_FLAGS: flags used to link libc++abi
5# - LIBCXXABI_LIBRARIES: libraries to link libc++abi to.
6
7include(CheckCXXCompilerFlag)
8
9unset(add_flag_if_supported)
10
11# Mangle the name of a compiler flag into a valid CMake identifier.
12# Ex: --std=c++11 -> STD_EQ_CXX11
13macro(mangle_name str output)
14  string(STRIP "${str}" strippedStr)
15  string(REGEX REPLACE "^/" "" strippedStr "${strippedStr}")
16  string(REGEX REPLACE "^-+" "" strippedStr "${strippedStr}")
17  string(REGEX REPLACE "-+$" "" strippedStr "${strippedStr}")
18  string(REPLACE "-" "_" strippedStr "${strippedStr}")
19  string(REPLACE "=" "_EQ_" strippedStr "${strippedStr}")
20  string(REPLACE "+" "X" strippedStr "${strippedStr}")
21  string(TOUPPER "${strippedStr}" ${output})
22endmacro()
23
24# Remove a list of flags from all CMake variables that affect compile flags.
25# This can be used to remove unwanted flags specified on the command line
26# or added in other parts of LLVM's cmake configuration.
27macro(remove_flags)
28  foreach(var ${ARGN})
29    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
30    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}")
31    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
32    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
33    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
34    string(REPLACE "${var}" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
35    string(REPLACE "${var}" "" CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
36    string(REPLACE "${var}" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}")
37    string(REPLACE "${var}" "" CMAKE_SHARED_MODULE_FLAGS "${CMAKE_SHARED_MODULE_FLAGS}")
38    remove_definitions(${var})
39  endforeach()
40endmacro(remove_flags)
41
42macro(check_flag_supported flag)
43    mangle_name("${flag}" flagname)
44    check_cxx_compiler_flag("${flag}" "LIBCXXABI_SUPPORTS_${flagname}_FLAG")
45endmacro()
46
47macro(append_flags DEST)
48  foreach(value ${ARGN})
49    list(APPEND ${DEST} ${value})
50    list(APPEND ${DEST} ${value})
51  endforeach()
52endmacro()
53
54# If the specified 'condition' is true then append the specified list of flags to DEST
55macro(append_flags_if condition DEST)
56  if (${condition})
57    list(APPEND ${DEST} ${ARGN})
58  endif()
59endmacro()
60
61# Add each flag in the list specified by DEST if that flag is supported by the current compiler.
62macro(append_flags_if_supported DEST)
63  foreach(flag ${ARGN})
64    mangle_name("${flag}" flagname)
65    check_cxx_compiler_flag("${flag}" "LIBCXXABI_SUPPORTS_${flagname}_FLAG")
66    append_flags_if(LIBCXXABI_SUPPORTS_${flagname}_FLAG ${DEST} ${flag})
67  endforeach()
68endmacro()
69
70# Add a macro definition if condition is true.
71macro(define_if condition def)
72  if (${condition})
73    add_definitions(${def})
74  endif()
75endmacro()
76
77# Add a macro definition if condition is not true.
78macro(define_if_not condition def)
79  if (NOT ${condition})
80    add_definitions(${def})
81  endif()
82endmacro()
83
84# Add a macro definition to the __config_site file if the specified condition
85# is 'true'. Note that '-D${def}' is not added. Instead it is expected that
86# the build include the '__config_site' header.
87macro(config_define_if condition def)
88  if (${condition})
89    set(${def} ON)
90    set(LIBCXXABI_NEEDS_SITE_CONFIG ON)
91  endif()
92endmacro()
93
94macro(config_define_if_not condition def)
95  if (NOT ${condition})
96    set(${def} ON)
97    set(LIBCXXABI_NEEDS_SITE_CONFIG ON)
98  endif()
99endmacro()
100
101macro(config_define value def)
102  set(${def} ${value})
103  set(LIBCXXABI_NEEDS_SITE_CONFIG ON)
104endmacro()
105
106# Add a list of flags to all of 'CMAKE_CXX_FLAGS', 'CMAKE_C_FLAGS',
107# 'LIBCXXABI_COMPILE_FLAGS' and 'LIBCXXABI_LINK_FLAGS'.
108macro(add_target_flags)
109  foreach(value ${ARGN})
110    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${value}")
111    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${value}")
112    list(APPEND LIBCXXABI_COMPILE_FLAGS ${value})
113    list(APPEND LIBCXXABI_LINK_FLAGS ${value})
114  endforeach()
115endmacro()
116
117# If the specified 'condition' is true then add a list of flags to
118# all of 'CMAKE_CXX_FLAGS', 'CMAKE_C_FLAGS', 'LIBCXXABI_COMPILE_FLAGS'
119# and 'LIBCXXABI_LINK_FLAGS'.
120macro(add_target_flags_if condition)
121  if (${condition})
122    add_target_flags(${ARGN})
123  endif()
124endmacro()
125
126# Add a specified list of flags to both 'LIBCXXABI_COMPILE_FLAGS' and
127# 'LIBCXXABI_LINK_FLAGS'.
128macro(add_flags)
129  foreach(value ${ARGN})
130    list(APPEND LIBCXXABI_COMPILE_FLAGS ${value})
131    list(APPEND LIBCXXABI_LINK_FLAGS ${value})
132  endforeach()
133endmacro()
134
135# If the specified 'condition' is true then add a list of flags to both
136# 'LIBCXXABI_COMPILE_FLAGS' and 'LIBCXXABI_LINK_FLAGS'.
137macro(add_flags_if condition)
138  if (${condition})
139    add_flags(${ARGN})
140  endif()
141endmacro()
142
143# Add each flag in the list to LIBCXXABI_COMPILE_FLAGS and LIBCXXABI_LINK_FLAGS
144# if that flag is supported by the current compiler.
145macro(add_flags_if_supported)
146  foreach(flag ${ARGN})
147      mangle_name("${flag}" flagname)
148      check_cxx_compiler_flag("${flag}" "LIBCXXABI_SUPPORTS_${flagname}_FLAG")
149      add_flags_if(LIBCXXABI_SUPPORTS_${flagname}_FLAG ${flag})
150  endforeach()
151endmacro()
152
153# Add a list of flags to 'LIBCXXABI_COMPILE_FLAGS'.
154macro(add_compile_flags)
155  foreach(f ${ARGN})
156    list(APPEND LIBCXXABI_COMPILE_FLAGS ${f})
157  endforeach()
158endmacro()
159
160# If 'condition' is true then add the specified list of flags to
161# 'LIBCXXABI_COMPILE_FLAGS'
162macro(add_compile_flags_if condition)
163  if (${condition})
164    add_compile_flags(${ARGN})
165  endif()
166endmacro()
167
168# For each specified flag, add that flag to 'LIBCXXABI_COMPILE_FLAGS' if the
169# flag is supported by the C++ compiler.
170macro(add_compile_flags_if_supported)
171  foreach(flag ${ARGN})
172      mangle_name("${flag}" flagname)
173      check_cxx_compiler_flag("${flag}" "LIBCXXABI_SUPPORTS_${flagname}_FLAG")
174      add_compile_flags_if(LIBCXXABI_SUPPORTS_${flagname}_FLAG ${flag})
175  endforeach()
176endmacro()
177
178# For each specified flag, add that flag to 'LIBCXXABI_COMPILE_FLAGS' if the
179# flag is supported by the C compiler.
180macro(add_c_compile_flags_if_supported)
181  foreach(flag ${ARGN})
182      mangle_name("${flag}" flagname)
183      check_c_compiler_flag("${flag}" "LIBCXXABI_SUPPORTS_${flagname}_FLAG")
184      add_compile_flags_if(LIBCXXABI_SUPPORTS_${flagname}_FLAG ${flag})
185  endforeach()
186endmacro()
187
188# Add a list of flags to 'LIBCXXABI_LINK_FLAGS'.
189macro(add_link_flags)
190  foreach(f ${ARGN})
191    list(APPEND LIBCXXABI_LINK_FLAGS ${f})
192  endforeach()
193endmacro()
194
195# If 'condition' is true then add the specified list of flags to
196# 'LIBCXXABI_LINK_FLAGS'
197macro(add_link_flags_if condition)
198  if (${condition})
199    add_link_flags(${ARGN})
200  endif()
201endmacro()
202
203# For each specified flag, add that flag to 'LIBCXXABI_LINK_FLAGS' if the
204# flag is supported by the C++ compiler.
205macro(add_link_flags_if_supported)
206  foreach(flag ${ARGN})
207    mangle_name("${flag}" flagname)
208    check_cxx_compiler_flag("${flag}" "LIBCXXABI_SUPPORTS_${flagname}_FLAG")
209    add_link_flags_if(LIBCXXABI_SUPPORTS_${flagname}_FLAG ${flag})
210  endforeach()
211endmacro()
212
213# Add a list of libraries or link flags to 'LIBCXXABI_LIBRARIES'.
214macro(add_library_flags)
215  foreach(lib ${ARGN})
216    list(APPEND LIBCXXABI_LIBRARIES ${lib})
217  endforeach()
218endmacro()
219
220# if 'condition' is true then add the specified list of libraries and flags
221# to 'LIBCXXABI_LIBRARIES'.
222macro(add_library_flags_if condition)
223  if(${condition})
224    add_library_flags(${ARGN})
225  endif()
226endmacro()
227
228# Turn a comma separated CMake list into a space separated string.
229macro(split_list listname)
230  string(REPLACE ";" " " ${listname} "${${listname}}")
231endmacro()
232