1# 2# Copyright 2017 The Abseil Authors. 3# 4# Licensed under the Apache License, Version 2.0 (the "License"); 5# you may not use this file except in compliance with the License. 6# You may obtain a copy of the License at 7# 8# https://www.apache.org/licenses/LICENSE-2.0 9# 10# Unless required by applicable law or agreed to in writing, software 11# distributed under the License is distributed on an "AS IS" BASIS, 12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13# See the License for the specific language governing permissions and 14# limitations under the License. 15# 16 17include(CMakeParseArguments) 18include(AbseilConfigureCopts) 19include(AbseilDll) 20 21# The IDE folder for Abseil that will be used if Abseil is included in a CMake 22# project that sets 23# set_property(GLOBAL PROPERTY USE_FOLDERS ON) 24# For example, Visual Studio supports folders. 25if(NOT DEFINED ABSL_IDE_FOLDER) 26 set(ABSL_IDE_FOLDER Abseil) 27endif() 28 29if(ABSL_USE_SYSTEM_INCLUDES) 30 set(ABSL_INTERNAL_INCLUDE_WARNING_GUARD SYSTEM) 31else() 32 set(ABSL_INTERNAL_INCLUDE_WARNING_GUARD "") 33endif() 34 35# absl_cc_library() 36# 37# CMake function to imitate Bazel's cc_library rule. 38# 39# Parameters: 40# NAME: name of target (see Note) 41# HDRS: List of public header files for the library 42# SRCS: List of source files for the library 43# DEPS: List of other libraries to be linked in to the binary targets 44# COPTS: List of private compile options 45# DEFINES: List of public defines 46# LINKOPTS: List of link options 47# PUBLIC: Add this so that this library will be exported under absl:: 48# Also in IDE, target will appear in Abseil folder while non PUBLIC will be in Abseil/internal. 49# TESTONLY: When added, this target will only be built if both 50# BUILD_TESTING=ON and ABSL_BUILD_TESTING=ON. 51# 52# Note: 53# By default, absl_cc_library will always create a library named absl_${NAME}, 54# and alias target absl::${NAME}. The absl:: form should always be used. 55# This is to reduce namespace pollution. 56# 57# absl_cc_library( 58# NAME 59# awesome 60# HDRS 61# "a.h" 62# SRCS 63# "a.cc" 64# ) 65# absl_cc_library( 66# NAME 67# fantastic_lib 68# SRCS 69# "b.cc" 70# DEPS 71# absl::awesome # not "awesome" ! 72# PUBLIC 73# ) 74# 75# absl_cc_library( 76# NAME 77# main_lib 78# ... 79# DEPS 80# absl::fantastic_lib 81# ) 82# 83# TODO(b/320467376): Implement "ALWAYSLINK". 84function(absl_cc_library) 85 cmake_parse_arguments(ABSL_CC_LIB 86 "DISABLE_INSTALL;PUBLIC;TESTONLY" 87 "NAME" 88 "HDRS;SRCS;COPTS;DEFINES;LINKOPTS;DEPS" 89 ${ARGN} 90 ) 91 92 if(ABSL_CC_LIB_TESTONLY AND 93 NOT ((BUILD_TESTING AND ABSL_BUILD_TESTING) OR 94 (ABSL_BUILD_TEST_HELPERS AND ABSL_CC_LIB_PUBLIC))) 95 return() 96 endif() 97 98 if(ABSL_ENABLE_INSTALL) 99 set(_NAME "${ABSL_CC_LIB_NAME}") 100 else() 101 set(_NAME "absl_${ABSL_CC_LIB_NAME}") 102 endif() 103 104 # Check if this is a header-only library 105 # Note that as of February 2019, many popular OS's (for example, Ubuntu 106 # 16.04 LTS) only come with cmake 3.5 by default. For this reason, we can't 107 # use list(FILTER...) 108 set(ABSL_CC_SRCS "${ABSL_CC_LIB_SRCS}") 109 foreach(src_file IN LISTS ABSL_CC_SRCS) 110 if(${src_file} MATCHES ".*\\.(h|inc)") 111 list(REMOVE_ITEM ABSL_CC_SRCS "${src_file}") 112 endif() 113 endforeach() 114 115 if(ABSL_CC_SRCS STREQUAL "") 116 set(ABSL_CC_LIB_IS_INTERFACE 1) 117 else() 118 set(ABSL_CC_LIB_IS_INTERFACE 0) 119 endif() 120 121 # Determine this build target's relationship to the DLL. It's one of four things: 122 # 1. "dll" -- This target is part of the DLL 123 # 2. "dll_dep" -- This target is not part of the DLL, but depends on the DLL. 124 # Note that we assume any target not in the DLL depends on the 125 # DLL. This is not a technical necessity but a convenience 126 # which happens to be true, because nearly every target is 127 # part of the DLL. 128 # 3. "shared" -- This is a shared library, perhaps on a non-windows platform 129 # where DLL doesn't make sense. 130 # 4. "static" -- This target does not depend on the DLL and should be built 131 # statically. 132 if (${ABSL_BUILD_DLL}) 133 if(ABSL_ENABLE_INSTALL) 134 absl_internal_dll_contains(TARGET ${_NAME} OUTPUT _in_dll) 135 absl_internal_test_dll_contains(TARGET ${_NAME} OUTPUT _in_test_dll) 136 else() 137 absl_internal_dll_contains(TARGET ${ABSL_CC_LIB_NAME} OUTPUT _in_dll) 138 absl_internal_test_dll_contains(TARGET ${ABSL_CC_LIB_NAME} OUTPUT _in_test_dll) 139 endif() 140 if (${_in_dll} OR ${_in_test_dll}) 141 # This target should be replaced by the DLL 142 set(_build_type "dll") 143 set(ABSL_CC_LIB_IS_INTERFACE 1) 144 else() 145 # Building a DLL, but this target is not part of the DLL 146 set(_build_type "dll_dep") 147 endif() 148 elseif(BUILD_SHARED_LIBS) 149 set(_build_type "shared") 150 else() 151 set(_build_type "static") 152 endif() 153 154 # Generate a pkg-config file for every library: 155 if(ABSL_ENABLE_INSTALL) 156 if(absl_VERSION) 157 set(PC_VERSION "${absl_VERSION}") 158 else() 159 set(PC_VERSION "head") 160 endif() 161 if(NOT _build_type STREQUAL "dll") 162 set(LNK_LIB "${LNK_LIB} -labsl_${_NAME}") 163 endif() 164 foreach(dep ${ABSL_CC_LIB_DEPS}) 165 if(${dep} MATCHES "^absl::(.*)") 166 # for DLL builds many libs are not created, but add 167 # the pkgconfigs nevertheless, pointing to the dll. 168 if(_build_type STREQUAL "dll") 169 # hide this MATCHES in an if-clause so it doesn't overwrite 170 # the CMAKE_MATCH_1 from (${dep} MATCHES "^absl::(.*)") 171 if(NOT PC_DEPS MATCHES "abseil_dll") 172 # Join deps with commas. 173 if(PC_DEPS) 174 set(PC_DEPS "${PC_DEPS},") 175 endif() 176 # don't duplicate dll-dep if it exists already 177 set(PC_DEPS "${PC_DEPS} abseil_dll = ${PC_VERSION}") 178 set(LNK_LIB "${LNK_LIB} -labseil_dll") 179 endif() 180 else() 181 # Join deps with commas. 182 if(PC_DEPS) 183 set(PC_DEPS "${PC_DEPS},") 184 endif() 185 set(PC_DEPS "${PC_DEPS} absl_${CMAKE_MATCH_1} = ${PC_VERSION}") 186 endif() 187 endif() 188 endforeach() 189 set(skip_next_cflag OFF) 190 foreach(cflag ${ABSL_CC_LIB_COPTS}) 191 if(skip_next_cflag) 192 set(skip_next_cflag OFF) 193 elseif(${cflag} MATCHES "^-Xarch_") 194 # An -Xarch_ flag implies that its successor only applies to the 195 # specified platform. Filter both of them out before the successor 196 # reaches the "^-m" filter. 197 set(skip_next_cflag ON) 198 elseif(${cflag} MATCHES "^(-Wno|/wd)") 199 # These flags are needed to suppress warnings that might fire in our headers. 200 set(PC_CFLAGS "${PC_CFLAGS} ${cflag}") 201 elseif(${cflag} MATCHES "^(-W|/w[1234eo])") 202 # Don't impose our warnings on others. 203 elseif(${cflag} MATCHES "^-m") 204 # Don't impose CPU instruction requirements on others, as 205 # the code performs feature detection on runtime. 206 else() 207 set(PC_CFLAGS "${PC_CFLAGS} ${cflag}") 208 endif() 209 endforeach() 210 string(REPLACE ";" " " PC_LINKOPTS "${ABSL_CC_LIB_LINKOPTS}") 211 FILE(GENERATE OUTPUT "${CMAKE_BINARY_DIR}/lib/pkgconfig/absl_${_NAME}.pc" CONTENT "\ 212prefix=${CMAKE_INSTALL_PREFIX}\n\ 213exec_prefix=\${prefix}\n\ 214libdir=${CMAKE_INSTALL_FULL_LIBDIR}\n\ 215includedir=${CMAKE_INSTALL_FULL_INCLUDEDIR}\n\ 216\n\ 217Name: absl_${_NAME}\n\ 218Description: Abseil ${_NAME} library\n\ 219URL: https://abseil.io/\n\ 220Version: ${PC_VERSION}\n\ 221Requires:${PC_DEPS}\n\ 222Libs: -L\${libdir} $<$<NOT:$<BOOL:${ABSL_CC_LIB_IS_INTERFACE}>>:${LNK_LIB}> ${PC_LINKOPTS}\n\ 223Cflags: -I\${includedir}${PC_CFLAGS}\n") 224 INSTALL(FILES "${CMAKE_BINARY_DIR}/lib/pkgconfig/absl_${_NAME}.pc" 225 DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig") 226 endif() 227 228 if(NOT ABSL_CC_LIB_IS_INTERFACE) 229 if(_build_type STREQUAL "dll_dep") 230 # This target depends on the DLL. When adding dependencies to this target, 231 # any depended-on-target which is contained inside the DLL is replaced 232 # with a dependency on the DLL. 233 add_library(${_NAME} STATIC "") 234 target_sources(${_NAME} PRIVATE ${ABSL_CC_LIB_SRCS} ${ABSL_CC_LIB_HDRS}) 235 absl_internal_dll_targets( 236 DEPS ${ABSL_CC_LIB_DEPS} 237 OUTPUT _dll_deps 238 ) 239 target_link_libraries(${_NAME} 240 PUBLIC ${_dll_deps} 241 PRIVATE 242 ${ABSL_CC_LIB_LINKOPTS} 243 ${ABSL_DEFAULT_LINKOPTS} 244 ) 245 246 if (ABSL_CC_LIB_TESTONLY) 247 set(_gtest_link_define "GTEST_LINKED_AS_SHARED_LIBRARY=1") 248 else() 249 set(_gtest_link_define) 250 endif() 251 252 target_compile_definitions(${_NAME} 253 PUBLIC 254 ABSL_CONSUME_DLL 255 "${_gtest_link_define}" 256 ) 257 258 elseif(_build_type STREQUAL "static" OR _build_type STREQUAL "shared") 259 add_library(${_NAME} "") 260 target_sources(${_NAME} PRIVATE ${ABSL_CC_LIB_SRCS} ${ABSL_CC_LIB_HDRS}) 261 target_link_libraries(${_NAME} 262 PUBLIC ${ABSL_CC_LIB_DEPS} 263 PRIVATE 264 ${ABSL_CC_LIB_LINKOPTS} 265 ${ABSL_DEFAULT_LINKOPTS} 266 ) 267 else() 268 message(FATAL_ERROR "Invalid build type: ${_build_type}") 269 endif() 270 271 # Linker language can be inferred from sources, but in the case of DLLs we 272 # don't have any .cc files so it would be ambiguous. We could set it 273 # explicitly only in the case of DLLs but, because "CXX" is always the 274 # correct linker language for static or for shared libraries, we set it 275 # unconditionally. 276 set_property(TARGET ${_NAME} PROPERTY LINKER_LANGUAGE "CXX") 277 278 target_include_directories(${_NAME} ${ABSL_INTERNAL_INCLUDE_WARNING_GUARD} 279 PUBLIC 280 "$<BUILD_INTERFACE:${ABSL_COMMON_INCLUDE_DIRS}>" 281 $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}> 282 ) 283 target_compile_options(${_NAME} 284 PRIVATE ${ABSL_CC_LIB_COPTS}) 285 target_compile_definitions(${_NAME} PUBLIC ${ABSL_CC_LIB_DEFINES}) 286 287 # Add all Abseil targets to a a folder in the IDE for organization. 288 if(ABSL_CC_LIB_PUBLIC) 289 set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}) 290 elseif(ABSL_CC_LIB_TESTONLY) 291 set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}/test) 292 else() 293 set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}/internal) 294 endif() 295 296 if(ABSL_PROPAGATE_CXX_STD) 297 # Abseil libraries require C++14 as the current minimum standard. When 298 # compiled with a higher standard (either because it is the compiler's 299 # default or explicitly requested), then Abseil requires that standard. 300 target_compile_features(${_NAME} PUBLIC ${ABSL_INTERNAL_CXX_STD_FEATURE}) 301 endif() 302 303 # When being installed, we lose the absl_ prefix. We want to put it back 304 # to have properly named lib files. This is a no-op when we are not being 305 # installed. 306 if(ABSL_ENABLE_INSTALL) 307 set_target_properties(${_NAME} PROPERTIES 308 OUTPUT_NAME "absl_${_NAME}" 309 SOVERSION 0 310 ) 311 endif() 312 else() 313 # Generating header-only library 314 add_library(${_NAME} INTERFACE) 315 target_include_directories(${_NAME} ${ABSL_INTERNAL_INCLUDE_WARNING_GUARD} 316 INTERFACE 317 "$<BUILD_INTERFACE:${ABSL_COMMON_INCLUDE_DIRS}>" 318 $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}> 319 ) 320 321 if (_build_type STREQUAL "dll") 322 set(ABSL_CC_LIB_DEPS abseil_dll) 323 endif() 324 325 target_link_libraries(${_NAME} 326 INTERFACE 327 ${ABSL_CC_LIB_DEPS} 328 ${ABSL_CC_LIB_LINKOPTS} 329 ${ABSL_DEFAULT_LINKOPTS} 330 ) 331 target_compile_definitions(${_NAME} INTERFACE ${ABSL_CC_LIB_DEFINES}) 332 333 if(ABSL_PROPAGATE_CXX_STD) 334 # Abseil libraries require C++14 as the current minimum standard. 335 # Top-level application CMake projects should ensure a consistent C++ 336 # standard for all compiled sources by setting CMAKE_CXX_STANDARD. 337 target_compile_features(${_NAME} INTERFACE ${ABSL_INTERNAL_CXX_STD_FEATURE}) 338 endif() 339 endif() 340 341 if(ABSL_ENABLE_INSTALL) 342 install(TARGETS ${_NAME} EXPORT ${PROJECT_NAME}Targets 343 RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} 344 LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} 345 ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} 346 ) 347 endif() 348 349 add_library(absl::${ABSL_CC_LIB_NAME} ALIAS ${_NAME}) 350endfunction() 351 352# absl_cc_test() 353# 354# CMake function to imitate Bazel's cc_test rule. 355# 356# Parameters: 357# NAME: name of target (see Usage below) 358# SRCS: List of source files for the binary 359# DEPS: List of other libraries to be linked in to the binary targets 360# COPTS: List of private compile options 361# DEFINES: List of public defines 362# LINKOPTS: List of link options 363# 364# Note: 365# By default, absl_cc_test will always create a binary named absl_${NAME}. 366# This will also add it to ctest list as absl_${NAME}. 367# 368# Usage: 369# absl_cc_library( 370# NAME 371# awesome 372# HDRS 373# "a.h" 374# SRCS 375# "a.cc" 376# PUBLIC 377# ) 378# 379# absl_cc_test( 380# NAME 381# awesome_test 382# SRCS 383# "awesome_test.cc" 384# DEPS 385# absl::awesome 386# GTest::gmock 387# GTest::gtest_main 388# ) 389function(absl_cc_test) 390 if(NOT (BUILD_TESTING AND ABSL_BUILD_TESTING)) 391 return() 392 endif() 393 394 cmake_parse_arguments(ABSL_CC_TEST 395 "" 396 "NAME" 397 "SRCS;COPTS;DEFINES;LINKOPTS;DEPS" 398 ${ARGN} 399 ) 400 401 set(_NAME "absl_${ABSL_CC_TEST_NAME}") 402 403 add_executable(${_NAME} "") 404 target_sources(${_NAME} PRIVATE ${ABSL_CC_TEST_SRCS}) 405 target_include_directories(${_NAME} 406 PUBLIC ${ABSL_COMMON_INCLUDE_DIRS} 407 PRIVATE ${absl_gtest_src_dir}/googletest/include ${absl_gtest_src_dir}/googlemock/include 408 ) 409 410 if (${ABSL_BUILD_DLL}) 411 target_compile_definitions(${_NAME} 412 PUBLIC 413 ${ABSL_CC_TEST_DEFINES} 414 ABSL_CONSUME_DLL 415 ABSL_CONSUME_TEST_DLL 416 GTEST_LINKED_AS_SHARED_LIBRARY=1 417 ) 418 419 # Replace dependencies on targets inside the DLL with abseil_dll itself. 420 absl_internal_dll_targets( 421 DEPS ${ABSL_CC_TEST_DEPS} 422 OUTPUT ABSL_CC_TEST_DEPS 423 ) 424 absl_internal_dll_targets( 425 DEPS ${ABSL_CC_TEST_LINKOPTS} 426 OUTPUT ABSL_CC_TEST_LINKOPTS 427 ) 428 else() 429 target_compile_definitions(${_NAME} 430 PUBLIC 431 ${ABSL_CC_TEST_DEFINES} 432 ) 433 endif() 434 target_compile_options(${_NAME} 435 PRIVATE ${ABSL_CC_TEST_COPTS} 436 ) 437 438 target_link_libraries(${_NAME} 439 PUBLIC ${ABSL_CC_TEST_DEPS} 440 PRIVATE ${ABSL_CC_TEST_LINKOPTS} 441 ) 442 # Add all Abseil targets to a folder in the IDE for organization. 443 set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}/test) 444 445 if(ABSL_PROPAGATE_CXX_STD) 446 # Abseil libraries require C++14 as the current minimum standard. 447 # Top-level application CMake projects should ensure a consistent C++ 448 # standard for all compiled sources by setting CMAKE_CXX_STANDARD. 449 target_compile_features(${_NAME} PUBLIC ${ABSL_INTERNAL_CXX_STD_FEATURE}) 450 endif() 451 452 add_test(NAME ${_NAME} COMMAND ${_NAME}) 453endfunction() 454