1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
#===============================================================================
# Define targets for linking against the selected ABI library
#
# After including this file, the following targets are defined:
# - libcxx-abi-headers: An interface target that allows getting access to the
# headers of the selected ABI library.
# - libcxx-abi-shared: A target representing the selected shared ABI library.
# - libcxx-abi-static: A target representing the selected static ABI library.
#
# Furthermore, some ABI libraries also define the following target:
# - libcxx-abi-shared-objects: An object library representing a set of object files
# constituting the ABI library, suitable for bundling
# into a shared library.
# - libcxx-abi-static-objects: An object library representing a set of object files
# constituting the ABI library, suitable for bundling
# into a static library.
#===============================================================================
include(GNUInstallDirs)
# This function copies the provided headers to a private directory and adds that
# path to the given INTERFACE target. That target can then be linked against to
# get access to those headers (and only those).
#
# The problem this solves is that when building against a system-provided ABI library,
# the ABI headers might live side-by-side with an actual C++ Standard Library
# installation. For that reason, we can't just add `-I <path-to-ABI-headers>`,
# since we would end up also adding the system-provided C++ Standard Library to
# the search path. Instead, what we do is copy just the ABI library headers to
# a private directory and add just that path when we build libc++.
function(import_private_headers target include_dirs headers)
foreach(header ${headers})
set(found FALSE)
foreach(incpath ${include_dirs})
if (EXISTS "${incpath}/${header}")
set(found TRUE)
message(STATUS "Looking for ${header} in ${incpath} - found")
get_filename_component(dstdir ${header} PATH)
get_filename_component(header_file ${header} NAME)
set(src ${incpath}/${header})
set(dst "${LIBCXX_BINARY_DIR}/private-abi-headers/${dstdir}/${header_file}")
add_custom_command(OUTPUT ${dst}
DEPENDS ${src}
COMMAND ${CMAKE_COMMAND} -E make_directory "${LIBCXX_BINARY_DIR}/private-abi-headers/${dstdir}"
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst}
COMMENT "Copying C++ ABI header ${header}")
list(APPEND abilib_headers "${dst}")
else()
message(STATUS "Looking for ${header} in ${incpath} - not found")
endif()
endforeach()
if (NOT found)
message(WARNING "Failed to find ${header} in ${include_dirs}")
endif()
endforeach()
# Work around https://gitlab.kitware.com/cmake/cmake/-/issues/18399
add_library(${target}-generate-private-headers OBJECT ${abilib_headers})
set_target_properties(${target}-generate-private-headers PROPERTIES LINKER_LANGUAGE CXX)
target_link_libraries(${target} INTERFACE ${target}-generate-private-headers)
target_include_directories(${target} INTERFACE "${LIBCXX_BINARY_DIR}/private-abi-headers")
endfunction()
# This function creates an imported library named <target> of the given <kind> (SHARED|STATIC).
# It imports a library named <name> searched at the given <path>.
function(imported_library target kind path name)
add_library(${target} ${kind} IMPORTED GLOBAL)
set(libnames "${CMAKE_${kind}_LIBRARY_PREFIX}${name}${CMAKE_${kind}_LIBRARY_SUFFIX}")
# Make sure we find .tbd files on macOS
if (kind STREQUAL "SHARED")
list(APPEND libnames "${CMAKE_${kind}_LIBRARY_PREFIX}${name}.tbd")
endif()
find_library(file
NAMES ${libnames}
PATHS "${path}"
NO_CACHE)
set_target_properties(${target} PROPERTIES IMPORTED_LOCATION "${file}")
endfunction()
# Link against a system-provided libstdc++
if ("${LIBCXX_CXX_ABI}" STREQUAL "libstdc++")
add_library(libcxx-abi-headers INTERFACE)
import_private_headers(libcxx-abi-headers "${LIBCXX_CXX_ABI_INCLUDE_PATHS}"
"cxxabi.h;bits/c++config.h;bits/os_defines.h;bits/cpu_defines.h;bits/cxxabi_tweaks.h;bits/cxxabi_forced.h")
target_compile_definitions(libcxx-abi-headers INTERFACE "-DLIBSTDCXX" "-D__GLIBCXX__")
imported_library(libcxx-abi-shared SHARED "${LIBCXX_CXX_ABI_LIBRARY_PATH}" stdc++)
target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers)
imported_library(libcxx-abi-static STATIC "${LIBCXX_CXX_ABI_LIBRARY_PATH}" stdc++)
target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers)
# Link against a system-provided libsupc++
elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libsupc++")
add_library(libcxx-abi-headers INTERFACE)
import_private_headers(libcxx-abi-headers "${LIBCXX_CXX_ABI_INCLUDE_PATHS}"
"cxxabi.h;bits/c++config.h;bits/os_defines.h;bits/cpu_defines.h;bits/cxxabi_tweaks.h;bits/cxxabi_forced.h")
target_compile_definitions(libcxx-abi-headers INTERFACE "-D__GLIBCXX__")
imported_library(libcxx-abi-shared SHARED "${LIBCXX_CXX_ABI_LIBRARY_PATH}" supc++)
target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers)
imported_library(libcxx-abi-static STATIC "${LIBCXX_CXX_ABI_LIBRARY_PATH}" supc++)
target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers)
# Link against the in-tree libc++abi
elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libcxxabi")
add_library(libcxx-abi-headers INTERFACE)
target_link_libraries(libcxx-abi-headers INTERFACE cxxabi-headers)
target_compile_definitions(libcxx-abi-headers INTERFACE "-DLIBCXX_BUILDING_LIBCXXABI")
if (TARGET cxxabi_shared)
add_library(libcxx-abi-shared ALIAS cxxabi_shared)
endif()
if (TARGET cxxabi_static)
add_library(libcxx-abi-static ALIAS cxxabi_static)
endif()
if (TARGET cxxabi_shared_objects)
add_library(libcxx-abi-shared-objects ALIAS cxxabi_shared_objects)
endif()
if (TARGET cxxabi_static_objects)
add_library(libcxx-abi-static-objects ALIAS cxxabi_static_objects)
endif()
# Link against a system-provided libc++abi
elseif ("${LIBCXX_CXX_ABI}" STREQUAL "system-libcxxabi")
add_library(libcxx-abi-headers INTERFACE)
import_private_headers(libcxx-abi-headers "${LIBCXX_CXX_ABI_INCLUDE_PATHS}" "cxxabi.h;__cxxabi_config.h")
target_compile_definitions(libcxx-abi-headers INTERFACE "-DLIBCXX_BUILDING_LIBCXXABI")
imported_library(libcxx-abi-shared SHARED "${LIBCXX_CXX_ABI_LIBRARY_PATH}" c++abi)
target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers)
imported_library(libcxx-abi-static STATIC "${LIBCXX_CXX_ABI_LIBRARY_PATH}" c++abi)
target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers)
# Link against a system-provided libcxxrt
elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libcxxrt")
# libcxxrt does not provide aligned new and delete operators
# TODO: We're keeping this for backwards compatibility, but this doesn't belong here.
set(LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS ON)
if(NOT LIBCXX_CXX_ABI_INCLUDE_PATHS)
message(STATUS "LIBCXX_CXX_ABI_INCLUDE_PATHS not set, using /usr/include/c++/v1")
set(LIBCXX_CXX_ABI_INCLUDE_PATHS "/usr/include/c++/v1")
endif()
add_library(libcxx-abi-headers INTERFACE)
import_private_headers(libcxx-abi-headers "${LIBCXX_CXX_ABI_INCLUDE_PATHS}"
"cxxabi.h;unwind.h;unwind-arm.h;unwind-itanium.h")
target_compile_definitions(libcxx-abi-headers INTERFACE "-DLIBCXXRT")
imported_library(libcxx-abi-shared SHARED "${LIBCXX_CXX_ABI_LIBRARY_PATH}" cxxrt)
target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers)
imported_library(libcxx-abi-static STATIC "${LIBCXX_CXX_ABI_LIBRARY_PATH}" cxxrt)
target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers)
# Link against a system-provided vcruntime
# FIXME: Figure out how to configure the ABI library on Windows.
elseif ("${LIBCXX_CXX_ABI}" STREQUAL "vcruntime")
add_library(libcxx-abi-headers INTERFACE)
add_library(libcxx-abi-shared INTERFACE)
add_library(libcxx-abi-static INTERFACE)
# Don't link against any ABI library
elseif ("${LIBCXX_CXX_ABI}" STREQUAL "none")
add_library(libcxx-abi-headers INTERFACE)
target_compile_definitions(libcxx-abi-headers INTERFACE "-D_LIBCPP_BUILDING_HAS_NO_ABI_LIBRARY")
add_library(libcxx-abi-shared INTERFACE)
target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers)
add_library(libcxx-abi-static INTERFACE)
target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers)
endif()
|
