1# HandleLibcxxFlags - A set of macros used to setup the flags used to compile
2# and link libc++. These macros add flags to the following CMake variables.
3# - LIBCXX_COMPILE_FLAGS: flags used to compile libc++
4# - LIBCXX_LINK_FLAGS: flags used to link libc++
5# - LIBCXX_LIBRARIES: libraries to link libc++ 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 ":" "_COLON_" strippedStr "${strippedStr}")
20  string(REPLACE "=" "_EQ_" strippedStr "${strippedStr}")
21  string(REPLACE "+" "X" strippedStr "${strippedStr}")
22  string(TOUPPER "${strippedStr}" ${output})
23endmacro()
24
25# Remove a list of flags from all CMake variables that affect compile flags.
26# This can be used to remove unwanted flags specified on the command line
27# or added in other parts of LLVM's cmake configuration.
28macro(remove_flags)
29  foreach(var ${ARGN})
30    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
31    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}")
32    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
33    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
34    string(REPLACE "${var}" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
35    string(REPLACE "${var}" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
36    string(REPLACE "${var}" "" CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
37    string(REPLACE "${var}" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}")
38    string(REPLACE "${var}" "" CMAKE_SHARED_MODULE_FLAGS "${CMAKE_SHARED_MODULE_FLAGS}")
39    remove_definitions(${var})
40  endforeach()
41endmacro(remove_flags)
42
43macro(check_flag_supported flag)
44    mangle_name("${flag}" flagname)
45    check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
46endmacro()
47
48macro(append_flags DEST)
49  foreach(value ${ARGN})
50    list(APPEND ${DEST} ${value})
51    list(APPEND ${DEST} ${value})
52  endforeach()
53endmacro()
54
55# If the specified 'condition' is true then append the specified list of flags to DEST
56macro(append_flags_if condition DEST)
57  if (${condition})
58    list(APPEND ${DEST} ${ARGN})
59  endif()
60endmacro()
61
62# Add each flag in the list specified by DEST if that flag is supported by the current compiler.
63macro(append_flags_if_supported DEST)
64  foreach(flag ${ARGN})
65    mangle_name("${flag}" flagname)
66    check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
67    append_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${DEST} ${flag})
68  endforeach()
69endmacro()
70
71# Add a macro definition if condition is true.
72macro(define_if condition def)
73  if (${condition})
74    add_definitions(${def})
75  endif()
76endmacro()
77
78# Add a macro definition if condition is not true.
79macro(define_if_not condition def)
80  if (NOT ${condition})
81    add_definitions(${def})
82  endif()
83endmacro()
84
85# Add a macro definition to the __config_site file if the specified condition
86# is 'true'. Note that '-D${def}' is not added. Instead it is expected that
87# the build include the '__config_site' header.
88macro(config_define_if condition def)
89  if (${condition})
90    set(${def} ON)
91    set(LIBCXX_NEEDS_SITE_CONFIG ON)
92  endif()
93endmacro()
94
95macro(config_define_if_not condition def)
96  if (NOT ${condition})
97    set(${def} ON)
98    set(LIBCXX_NEEDS_SITE_CONFIG ON)
99  endif()
100endmacro()
101
102macro(config_define value def)
103  set(${def} ${value})
104  set(LIBCXX_NEEDS_SITE_CONFIG ON)
105endmacro()
106
107# Add a list of flags to all of 'CMAKE_CXX_FLAGS', 'CMAKE_C_FLAGS',
108# 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'.
109macro(add_target_flags)
110  foreach(value ${ARGN})
111    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${value}")
112    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${value}")
113    list(APPEND LIBCXX_COMPILE_FLAGS ${value})
114    list(APPEND LIBCXX_LINK_FLAGS ${value})
115  endforeach()
116endmacro()
117
118# If the specified 'condition' is true then add a list of flags to
119# all of 'CMAKE_CXX_FLAGS', 'CMAKE_C_FLAGS', 'LIBCXX_COMPILE_FLAGS'
120# and 'LIBCXX_LINK_FLAGS'.
121macro(add_target_flags_if condition)
122  if (${condition})
123    add_target_flags(${ARGN})
124  endif()
125endmacro()
126
127# Add a specified list of flags to both 'LIBCXX_COMPILE_FLAGS' and
128# 'LIBCXX_LINK_FLAGS'.
129macro(add_flags)
130  foreach(value ${ARGN})
131    list(APPEND LIBCXX_COMPILE_FLAGS ${value})
132    list(APPEND LIBCXX_LINK_FLAGS ${value})
133  endforeach()
134endmacro()
135
136# If the specified 'condition' is true then add a list of flags to both
137# 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'.
138macro(add_flags_if condition)
139  if (${condition})
140    add_flags(${ARGN})
141  endif()
142endmacro()
143
144# Add each flag in the list to LIBCXX_COMPILE_FLAGS and LIBCXX_LINK_FLAGS
145# if that flag is supported by the current compiler.
146macro(add_flags_if_supported)
147  foreach(flag ${ARGN})
148      mangle_name("${flag}" flagname)
149      check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
150      add_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${flag})
151  endforeach()
152endmacro()
153
154# Add a list of flags to 'LIBCXX_COMPILE_FLAGS'.
155macro(add_compile_flags)
156  foreach(f ${ARGN})
157    list(APPEND LIBCXX_COMPILE_FLAGS ${f})
158  endforeach()
159endmacro()
160
161# If 'condition' is true then add the specified list of flags to
162# 'LIBCXX_COMPILE_FLAGS'
163macro(add_compile_flags_if condition)
164  if (${condition})
165    add_compile_flags(${ARGN})
166  endif()
167endmacro()
168
169# For each specified flag, add that flag to 'LIBCXX_COMPILE_FLAGS' if the
170# flag is supported by the C++ compiler.
171macro(add_compile_flags_if_supported)
172  foreach(flag ${ARGN})
173      mangle_name("${flag}" flagname)
174      check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
175      add_compile_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${flag})
176  endforeach()
177endmacro()
178
179# Add a list of flags to 'LIBCXX_LINK_FLAGS'.
180macro(add_link_flags)
181  foreach(f ${ARGN})
182    list(APPEND LIBCXX_LINK_FLAGS ${f})
183  endforeach()
184endmacro()
185
186# If 'condition' is true then add the specified list of flags to
187# 'LIBCXX_LINK_FLAGS'
188macro(add_link_flags_if condition)
189  if (${condition})
190    add_link_flags(${ARGN})
191  endif()
192endmacro()
193
194# For each specified flag, add that flag to 'LIBCXX_LINK_FLAGS' if the
195# flag is supported by the C++ compiler.
196macro(add_link_flags_if_supported)
197  foreach(flag ${ARGN})
198    mangle_name("${flag}" flagname)
199    check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
200    add_link_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${flag})
201  endforeach()
202endmacro()
203
204# Add a list of libraries or link flags to 'LIBCXX_LIBRARIES'.
205macro(add_library_flags)
206  foreach(lib ${ARGN})
207    list(APPEND LIBCXX_LIBRARIES ${lib})
208  endforeach()
209endmacro()
210
211# if 'condition' is true then add the specified list of libraries and flags
212# to 'LIBCXX_LIBRARIES'.
213macro(add_library_flags_if condition)
214  if(${condition})
215    add_library_flags(${ARGN})
216  endif()
217endmacro()
218
219# Turn a comma separated CMake list into a space separated string.
220macro(split_list listname)
221  string(REPLACE ";" " " ${listname} "${${listname}}")
222endmacro()
223
224# For each specified flag, add that link flag to the provided target.
225# The flags are added with the given visibility, i.e. PUBLIC|PRIVATE|INTERFACE.
226function(target_add_link_flags_if_supported target visibility)
227  foreach(flag ${ARGN})
228    mangle_name("${flag}" flagname)
229    check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
230    if (LIBCXX_SUPPORTS_${flagname}_FLAG)
231      target_link_libraries(${target} ${visibility} ${flag})
232    endif()
233  endforeach()
234endfunction()
235
236# For each specified flag, add that compile flag to the provided target.
237# The flags are added with the given visibility, i.e. PUBLIC|PRIVATE|INTERFACE.
238function(target_add_compile_flags_if_supported target visibility)
239  foreach(flag ${ARGN})
240    mangle_name("${flag}" flagname)
241    check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
242    if (LIBCXX_SUPPORTS_${flagname}_FLAG)
243      target_compile_options(${target} ${visibility} ${flag})
244    endif()
245  endforeach()
246endfunction()
247