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2618e0257e
Re-word the documentation to make clear that CMake integrates usage requirements during generation and not synchronously during configuration or execution of target_link_libraries.
189 lines
8.0 KiB
C++
189 lines
8.0 KiB
C++
/*============================================================================
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CMake - Cross Platform Makefile Generator
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Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
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Distributed under the OSI-approved BSD License (the "License");
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see accompanying file Copyright.txt for details.
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This software is distributed WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the License for more information.
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============================================================================*/
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#ifndef cmTargetLinkLibrariesCommand_h
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#define cmTargetLinkLibrariesCommand_h
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#include "cmCommand.h"
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#include "cmDocumentGeneratorExpressions.h"
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/** \class cmTargetLinkLibrariesCommand
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* \brief Specify a list of libraries to link into executables.
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*
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* cmTargetLinkLibrariesCommand is used to specify a list of libraries to link
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* into executable(s) or shared objects. The names of the libraries
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* should be those defined by the LIBRARY(library) command(s).
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*/
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class cmTargetLinkLibrariesCommand : public cmCommand
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{
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public:
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/**
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* This is a virtual constructor for the command.
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*/
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virtual cmCommand* Clone()
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{
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return new cmTargetLinkLibrariesCommand;
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}
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/**
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* This is called when the command is first encountered in
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* the CMakeLists.txt file.
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*/
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virtual bool InitialPass(std::vector<std::string> const& args,
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cmExecutionStatus &status);
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/**
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* The name of the command as specified in CMakeList.txt.
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*/
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virtual const char* GetName() const { return "target_link_libraries";}
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/**
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* Succinct documentation.
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*/
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virtual const char* GetTerseDocumentation() const
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{
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return
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"Link a target to given libraries.";
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}
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/**
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* More documentation.
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*/
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virtual const char* GetFullDocumentation() const
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{
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return
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" target_link_libraries(<target> [item1 [item2 [...]]]\n"
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" [[debug|optimized|general] <item>] ...)\n"
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"Specify libraries or flags to use when linking a given target. "
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"The named <target> must have been created in the current directory "
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"by a command such as add_executable or add_library. "
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"The remaining arguments specify library names or flags. "
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"Repeated calls for the same <target> append items in the order called."
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"\n"
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"If a library name matches that of another target in the project "
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"a dependency will automatically be added in the build system to make "
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"sure the library being linked is up-to-date before the target links. "
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"Item names starting with '-', but not '-l' or '-framework', are "
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"treated as linker flags."
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"\n"
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"A \"debug\", \"optimized\", or \"general\" keyword indicates that "
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"the library immediately following it is to be used only for the "
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"corresponding build configuration. "
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"The \"debug\" keyword corresponds to the Debug configuration "
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"(or to configurations named in the DEBUG_CONFIGURATIONS global "
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"property if it is set). "
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"The \"optimized\" keyword corresponds to all other configurations. "
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"The \"general\" keyword corresponds to all configurations, and is "
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"purely optional (assumed if omitted). "
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"Higher granularity may be achieved for per-configuration rules "
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"by creating and linking to IMPORTED library targets. "
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"See the IMPORTED mode of the add_library command for more "
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"information. "
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"\n"
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"Library dependencies are transitive by default. "
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"When this target is linked into another target then the libraries "
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"linked to this target will appear on the link line for the other "
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"target too. "
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"See the LINK_INTERFACE_LIBRARIES target property to override the "
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"set of transitive link dependencies for a target. "
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"Calls to other signatures of this command may set the property "
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"making any libraries linked exclusively by this signature private."
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"\n"
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"CMake will also propagate \"usage requirements\" from linked library "
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"targets. "
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"Usage requirements affect compilation of sources in the <target>. "
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"They are specified by properties defined on linked targets. "
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"During generation of the build system, CMake integrates "
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"usage requirement property values with the corresponding "
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"build properties for <target>:\n"
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" INTERFACE_COMPILE_DEFINITONS: Appends to COMPILE_DEFINITONS\n"
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" INTERFACE_INCLUDE_DIRECTORIES: Appends to INCLUDE_DIRECTORIES\n"
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" INTERFACE_POSITION_INDEPENDENT_CODE: Sets POSITION_INDEPENDENT_CODE\n"
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" or checked for consistency with existing value\n"
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"\n"
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" target_link_libraries(<target> LINK_INTERFACE_LIBRARIES\n"
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" [[debug|optimized|general] <lib>] ...)\n"
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"The LINK_INTERFACE_LIBRARIES mode appends the libraries "
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"to the LINK_INTERFACE_LIBRARIES and its per-configuration equivalent "
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"target properties instead of using them for linking. "
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"Libraries specified as \"debug\" are appended to the "
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"LINK_INTERFACE_LIBRARIES_DEBUG property (or to the properties "
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"corresponding to configurations listed in the DEBUG_CONFIGURATIONS "
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"global property if it is set). "
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"Libraries specified as \"optimized\" are appended to the "
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"LINK_INTERFACE_LIBRARIES property. "
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"Libraries specified as \"general\" (or without any keyword) are "
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"treated as if specified for both \"debug\" and \"optimized\"."
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"\n"
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" target_link_libraries(<target>\n"
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" <LINK_PRIVATE|LINK_PUBLIC>\n"
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" [[debug|optimized|general] <lib>] ...\n"
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" [<LINK_PRIVATE|LINK_PUBLIC>\n"
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" [[debug|optimized|general] <lib>] ...])\n"
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"The LINK_PUBLIC and LINK_PRIVATE modes can be used to specify both "
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"the link dependencies and the link interface in one command. "
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"Libraries and targets following LINK_PUBLIC are linked to, and are "
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"made part of the LINK_INTERFACE_LIBRARIES. Libraries and targets "
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"following LINK_PRIVATE are linked to, but are not made part of the "
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"LINK_INTERFACE_LIBRARIES. "
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"\n"
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"The library dependency graph is normally acyclic (a DAG), but in the "
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"case of mutually-dependent STATIC libraries CMake allows the graph "
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"to contain cycles (strongly connected components). "
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"When another target links to one of the libraries CMake repeats "
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"the entire connected component. "
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"For example, the code\n"
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" add_library(A STATIC a.c)\n"
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" add_library(B STATIC b.c)\n"
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" target_link_libraries(A B)\n"
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" target_link_libraries(B A)\n"
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" add_executable(main main.c)\n"
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" target_link_libraries(main A)\n"
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"links 'main' to 'A B A B'. "
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"("
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"While one repetition is usually sufficient, pathological object "
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"file and symbol arrangements can require more. "
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"One may handle such cases by manually repeating the component in "
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"the last target_link_libraries call. "
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"However, if two archives are really so interdependent they should "
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"probably be combined into a single archive."
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")"
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"\n"
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"Arguments to target_link_libraries may use \"generator expressions\" "
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"with the syntax \"$<...>\". Note however, that generator expressions "
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"will not be used in OLD handling of CMP0003 or CMP0004."
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"\n"
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CM_DOCUMENT_COMMAND_GENERATOR_EXPRESSIONS
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;
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}
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cmTypeMacro(cmTargetLinkLibrariesCommand, cmCommand);
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private:
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void LinkLibraryTypeSpecifierWarning(int left, int right);
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static const char* LinkLibraryTypeNames[3];
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cmTarget* Target;
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enum ProcessingState {
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ProcessingLinkLibraries,
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ProcessingLinkInterface,
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ProcessingPublicInterface,
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ProcessingPrivateInterface
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};
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ProcessingState CurrentProcessingState;
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void HandleLibrary(const char* lib, cmTarget::LinkLibraryType llt);
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};
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#endif
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