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jpayne@68
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1 # This CMake script adds imported targets for each shared library and executable distributed by
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2 # Cap'n Proto's autotools build.
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3 #
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4 # This file IS NOT USED by the CMake build! The CMake build generates its own version of this script
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5 # from its set of exported targets. I used such a generated script as a reference when writing this
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6 # one.
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7 #
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8 # The set of library targets provided by this script is automatically generated from the list of .pc
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jpayne@68
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9 # files maintained in configure.ac. The set of executable targets is hard-coded in this file.
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jpayne@68
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10 #
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11 # You can request that this script print debugging information by invoking cmake with:
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12 #
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13 # -DCapnProto_DEBUG=ON
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14 #
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15 # TODO(someday): Distinguish between debug and release builds. I.e., set IMPORTED_LOCATION_RELEASE
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16 # rather than IMPORTED_LOCATION, etc., if this installation was configured as a release build. But
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17 # how do we tell? grep for -g in CXXFLAGS?
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18
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19 if(CMAKE_VERSION VERSION_LESS 3.1)
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20 message(FATAL_ERROR "CMake >= 3.1 required")
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21 endif()
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22
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23 set(forwarded_config_flags)
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24 if(CapnProto_FIND_QUIETLY)
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25 list(APPEND forwarded_config_flags QUIET)
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26 endif()
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27 if(CapnProto_FIND_REQUIRED)
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28 list(APPEND forwarded_config_flags REQUIRED)
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29 endif()
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jpayne@68
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30 # If the consuming project called find_package(CapnProto) with the QUIET or REQUIRED flags, forward
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31 # them to calls to find_package(PkgConfig) and pkg_check_modules(). Note that find_dependency()
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32 # would do this for us in the former case, but there is no such forwarding wrapper for
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33 # pkg_check_modules().
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34
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35 find_package(PkgConfig ${forwarded_config_flags})
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36 if(NOT ${PkgConfig_FOUND})
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jpayne@68
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37 # If we're here, the REQUIRED flag must not have been passed, else we would have had a fatal
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38 # error. Nevertheless, a diagnostic for this case is probably nice.
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39 if(NOT CapnProto_FIND_QUIETLY)
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40 message(WARNING "pkg-config cannot be found")
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41 endif()
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42 set(CapnProto_FOUND OFF)
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43 return()
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44 endif()
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45
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46 function(_capnp_import_pkg_config_target target)
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47 # Add an imported library target named CapnProto::${target}, using the output of various
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48 # invocations of `pkg-config ${target}`. The generated imported library target tries to mimic the
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49 # behavior of a real CMake-generated imported target as closely as possible.
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50 #
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51 # Usage: _capnp_import_pkg_config_target(target <all Cap'n Proto targets>)
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52
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53 set(all_targets ${ARGN})
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54
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55 pkg_check_modules(${target} ${forwarded_config_flags} ${target})
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56
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57 if(NOT ${${target}_FOUND})
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58 if(NOT CapnProto_FIND_QUIETLY)
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59 message(WARNING "CapnProtoConfig.cmake was configured to search for ${target}.pc, but pkg-config cannot find it. Ignoring this target.")
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60 endif()
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61 return()
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62 endif()
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63
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64 if(CapnProto_DEBUG)
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65 # Dump the information pkg-config discovered.
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66 foreach(var VERSION LIBRARY_DIRS LIBRARIES LDFLAGS_OTHER INCLUDE_DIRS CFLAGS_OTHER)
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67 message(STATUS "${target}_${var} = ${${target}_${var}}")
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68 endforeach()
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69 endif()
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70
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71 if(NOT ${${target}_VERSION} VERSION_EQUAL ${CapnProto_VERSION})
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72 if(NOT CapnProto_FIND_QUIETLY)
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73 message(WARNING "CapnProtoConfig.cmake was configured to search for version ${CapnProto_VERSION}, but ${target} version ${${target}_VERSION} was found. Ignoring this target.")
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74 endif()
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75 return()
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76 endif()
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77
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jpayne@68
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78 # Make an educated guess as to what the target's .so and .a filenames must be.
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79 set(target_name_shared
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80 ${CMAKE_SHARED_LIBRARY_PREFIX}${target}-${CapnProto_VERSION}${CMAKE_SHARED_LIBRARY_SUFFIX})
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81 set(target_name_static
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82 ${CMAKE_STATIC_LIBRARY_PREFIX}${target}${CMAKE_STATIC_LIBRARY_SUFFIX})
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83
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84 # Find the actual target's file. find_library() sets a cache variable, so I made the variable name
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85 # unique-ish.
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86 find_library(CapnProto_${target}_IMPORTED_LOCATION
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87 NAMES ${target_name_shared} ${target_name_static} # prefer libfoo-version.so over libfoo.a
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88 PATHS ${${target}_LIBRARY_DIRS}
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89 NO_DEFAULT_PATH
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90 )
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jpayne@68
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91 # If the installed version of Cap'n Proto is in a system location, pkg-config will not have filled
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92 # in ${target}_LIBRARY_DIRS. To account for this, fall back to a regular search.
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93 find_library(CapnProto_${target}_IMPORTED_LOCATION
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94 NAMES ${target_name_shared} ${target_name_static} # prefer libfoo-version.so over libfoo.a
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95 )
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96
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97 if(NOT CapnProto_${target}_IMPORTED_LOCATION)
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98 # Not an error if the library doesn't exist -- we may have found a lite mode installation.
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99 if(CapnProto_DEBUG)
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100 message(STATUS "${target} library does not exist")
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101 endif()
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102 return()
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103 endif()
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104
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105 # Record some information about this target -- shared versus static, location and soname -- which
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106 # we'll use to build our imported target later.
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107
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108 set(target_location ${CapnProto_${target}_IMPORTED_LOCATION})
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109 get_filename_component(target_name "${target_location}" NAME)
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110
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111 set(target_type STATIC)
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112 set(imported_soname_property)
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113 if(target_name STREQUAL ${target_name_shared})
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114 set(target_type SHARED)
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115 set(imported_soname_property IMPORTED_SONAME ${target_name})
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116 endif()
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117
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118 # Each library dependency of the target is either the target itself, a sibling Cap'n Proto
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119 # library, or a system library. We ignore the first case by removing this target from the
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120 # dependencies. The remaining dependencies are either passed through or, if they are a sibling
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121 # Cap'n Proto library, prefixed with `CapnProto::`.
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122 set(dependencies ${${target}_LIBRARIES})
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123 list(REMOVE_ITEM dependencies ${target})
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124 set(target_interface_libs)
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125 foreach(dependency ${dependencies})
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126 list(FIND all_targets ${dependency} target_index)
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127 # TODO(cleanup): CMake >= 3.3 lets us write: `if(NOT ${dependency} IN_LIST all_targets)`
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128 if(target_index EQUAL -1)
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129 list(APPEND target_interface_libs ${dependency})
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130 else()
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jpayne@68
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131 list(APPEND target_interface_libs CapnProto::${dependency})
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132 endif()
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133 endforeach()
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134
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135 add_library(CapnProto::${target} ${target_type} IMPORTED)
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136 set_target_properties(CapnProto::${target} PROPERTIES
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137 ${imported_soname_property}
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138 IMPORTED_LOCATION "${target_location}"
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139 # TODO(cleanup): Use cxx_std_14 once it's safe to require cmake 3.8.
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140 INTERFACE_COMPILE_FEATURES "cxx_generic_lambdas"
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141 INTERFACE_COMPILE_OPTIONS "${${target}_CFLAGS_OTHER}"
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142 INTERFACE_INCLUDE_DIRECTORIES "${${target}_INCLUDE_DIRS}"
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143
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144 # I'm dumping LDFLAGS_OTHER in with the libraries because there exists no
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145 # INTERFACE_LINK_OPTIONS. See https://gitlab.kitware.com/cmake/cmake/issues/16543.
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146 INTERFACE_LINK_LIBRARIES "${target_interface_libs};${${target}_LDFLAGS_OTHER}"
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147 )
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jpayne@68
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148
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149 if(CapnProto_DEBUG)
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150 # Dump all the properties we generated for the imported target.
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jpayne@68
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151 foreach(prop
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152 IMPORTED_LOCATION
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153 IMPORTED_SONAME
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154 INTERFACE_COMPILE_FEATURES
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155 INTERFACE_COMPILE_OPTIONS
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156 INTERFACE_INCLUDE_DIRECTORIES
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157 INTERFACE_LINK_LIBRARIES)
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158 get_target_property(value CapnProto::${target} ${prop})
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159 message(STATUS "CapnProto::${target} ${prop} = ${value}")
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jpayne@68
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160 endforeach()
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jpayne@68
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161 endif()
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jpayne@68
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162 endfunction()
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163
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jpayne@68
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164 # ========================================================================================
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165 # Imported library targets
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166
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jpayne@68
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167 # Build a list of targets to search for from the list of .pc files.
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jpayne@68
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168 # I.e. [somewhere/foo.pc, somewhere/bar.pc] -> [foo, bar]
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169 set(library_targets)
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170 foreach(filename ${CAPNP_PKG_CONFIG_FILES})
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171 get_filename_component(target ${filename} NAME_WE)
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172 list(APPEND library_targets ${target})
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jpayne@68
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173 endforeach()
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jpayne@68
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174
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jpayne@68
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175 # Try to add an imported library target CapnProto::foo for each foo.pc distributed with Cap'n Proto.
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176 foreach(target ${library_targets})
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177 _capnp_import_pkg_config_target(${target} ${library_targets})
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jpayne@68
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178 endforeach()
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jpayne@68
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179
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jpayne@68
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180 # Handle lite-mode and no libraries found cases. It is tempting to set a CapnProto_LITE variable
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181 # here, but the real CMake-generated implementation does no such thing -- we'd need to set it in
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182 # CapnProtoConfig.cmake.in itself.
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183 if(TARGET CapnProto::capnp AND TARGET CapnProto::kj)
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jpayne@68
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184 if(NOT TARGET CapnProto::capnp-rpc)
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jpayne@68
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185 if(NOT CapnProto_FIND_QUIETLY)
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186 message(STATUS "Found an installation of Cap'n Proto lite. Executable and library targets beyond libkj and libcapnp will be unavailable.")
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jpayne@68
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187 endif()
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jpayne@68
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188 # Lite mode doesn't include the executables, so return here.
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jpayne@68
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189 return()
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jpayne@68
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190 endif()
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jpayne@68
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191 else()
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jpayne@68
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192 # If we didn't even find capnp or kj, then we didn't find anything usable.
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jpayne@68
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193 set(CapnProto_FOUND OFF)
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194 return()
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jpayne@68
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195 endif()
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jpayne@68
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196
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jpayne@68
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197 # ========================================================================================
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jpayne@68
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198 # Imported executable targets
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199
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jpayne@68
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200 get_filename_component(_IMPORT_PREFIX "${CMAKE_CURRENT_LIST_FILE}" PATH)
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jpayne@68
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201 get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
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jpayne@68
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202 get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
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jpayne@68
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203 get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
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204
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jpayne@68
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205 # Add executable targets for the capnp compiler and plugins. This list must be kept manually in sync
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206 # with the rest of the project.
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207
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jpayne@68
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208 add_executable(CapnProto::capnp_tool IMPORTED)
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jpayne@68
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209 set_target_properties(CapnProto::capnp_tool PROPERTIES
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210 IMPORTED_LOCATION "${_IMPORT_PREFIX}/bin/capnp${CMAKE_EXECUTABLE_SUFFIX}"
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211 )
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jpayne@68
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212
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jpayne@68
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213 add_executable(CapnProto::capnpc_cpp IMPORTED)
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jpayne@68
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214 set_target_properties(CapnProto::capnpc_cpp PROPERTIES
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jpayne@68
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215 IMPORTED_LOCATION "${_IMPORT_PREFIX}/bin/capnpc-c++${CMAKE_EXECUTABLE_SUFFIX}"
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jpayne@68
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216 )
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jpayne@68
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217
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jpayne@68
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218 add_executable(CapnProto::capnpc_capnp IMPORTED)
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jpayne@68
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219 set_target_properties(CapnProto::capnpc_capnp PROPERTIES
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jpayne@68
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220 IMPORTED_LOCATION "${_IMPORT_PREFIX}/bin/capnpc-capnp${CMAKE_EXECUTABLE_SUFFIX}"
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jpayne@68
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221 )
|
