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05f162ce95
The code handling IMPLICIT_DEPENDS was only able to track a single file, the latest file replaced earlier files in the list. The documentation now mentions that the language has to be prefixed to every file and the test now uses two implicit dependencies, where only the second is modified to trigger re-running of the custom command. Alex Inspired-by: Michael Wild <themiwi@users.sourceforge.net>
191 lines
8.9 KiB
C++
191 lines
8.9 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 cmAddCustomCommandCommand_h
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#define cmAddCustomCommandCommand_h
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#include "cmCommand.h"
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#include "cmDocumentGeneratorExpressions.h"
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/** \class cmAddCustomCommandCommand
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* \brief
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*
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* cmAddCustomCommandCommand defines a new command (rule) that can
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* be executed within the build process
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*
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*/
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class cmAddCustomCommandCommand : 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 cmAddCustomCommandCommand;
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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 "add_custom_command";}
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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 "Add a custom build rule to the generated build system.";
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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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"There are two main signatures for add_custom_command "
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"The first signature is for adding a custom command "
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"to produce an output.\n"
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" add_custom_command(OUTPUT output1 [output2 ...]\n"
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" COMMAND command1 [ARGS] [args1...]\n"
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" [COMMAND command2 [ARGS] [args2...] ...]\n"
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" [MAIN_DEPENDENCY depend]\n"
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" [DEPENDS [depends...]]\n"
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" [IMPLICIT_DEPENDS <lang1> depend1\n"
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" [<lang2> depend2] ...]\n"
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" [WORKING_DIRECTORY dir]\n"
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" [COMMENT comment] [VERBATIM] [APPEND])\n"
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"This defines a command to generate specified OUTPUT file(s). "
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"A target created in the same directory (CMakeLists.txt file) that "
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"specifies any output of the custom command as a source file is given "
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"a rule to generate the file using the command at build time. "
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"Do not list the output in more than one independent target that may "
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"build in parallel or the two instances of the rule may conflict "
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"(instead use add_custom_target to drive the command and make the "
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"other targets depend on that one). "
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"If an output name is a relative path it will be interpreted "
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"relative to the build tree directory corresponding to the current "
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"source directory. "
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"Note that MAIN_DEPENDENCY is completely optional and is "
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"used as a suggestion to visual studio about where to hang the "
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"custom command. In makefile terms this creates a new target in the "
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"following form:\n"
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" OUTPUT: MAIN_DEPENDENCY DEPENDS\n"
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" COMMAND\n"
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"If more than one command is specified they will be executed in order. "
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"The optional ARGS argument is for backward compatibility and will be "
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"ignored.\n"
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"The second signature adds a custom command to a target "
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"such as a library or executable. This is useful for "
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"performing an operation before or after building the target. "
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"The command becomes part of the target and will only execute "
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"when the target itself is built. If the target is already built,"
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" the command will not execute.\n"
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" add_custom_command(TARGET target\n"
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" PRE_BUILD | PRE_LINK | POST_BUILD\n"
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" COMMAND command1 [ARGS] [args1...]\n"
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" [COMMAND command2 [ARGS] [args2...] ...]\n"
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" [WORKING_DIRECTORY dir]\n"
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" [COMMENT comment] [VERBATIM])\n"
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"This defines a new command that will be associated with "
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"building the specified target. When the command will "
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"happen is determined by which of the following is specified:\n"
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" PRE_BUILD - run before all other dependencies\n"
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" PRE_LINK - run after other dependencies\n"
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" POST_BUILD - run after the target has been built\n"
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"Note that the PRE_BUILD option is only supported on Visual "
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"Studio 7 or later. For all other generators PRE_BUILD "
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"will be treated as PRE_LINK.\n"
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"If WORKING_DIRECTORY is specified the command will be executed "
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"in the directory given. "
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"If it is a relative path it will be interpreted relative to the "
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"build tree directory corresponding to the current source directory. "
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"If COMMENT is set, the value will be displayed as a "
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"message before the commands are executed at build time. "
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"If APPEND is specified the COMMAND and DEPENDS option values "
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"are appended to the custom command for the first output specified. "
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"There must have already been a previous call to this command with "
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"the same output. The COMMENT, WORKING_DIRECTORY, and MAIN_DEPENDENCY "
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"options are currently ignored when APPEND is given, "
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"but may be used in the future."
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"\n"
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"If VERBATIM is given then all arguments to the commands will be "
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"escaped properly for the build tool so that the invoked command "
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"receives each argument unchanged. "
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"Note that one level of escapes is still used by the CMake language "
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"processor before add_custom_command even sees the arguments. "
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"Use of VERBATIM is recommended as it enables correct behavior. "
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"When VERBATIM is not given the behavior is platform specific because "
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"there is no protection of tool-specific special characters."
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"\n"
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"If the output of the custom command is not actually "
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"created as a file on disk it should be marked as SYMBOLIC with "
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"SET_SOURCE_FILES_PROPERTIES.\n"
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"The IMPLICIT_DEPENDS option requests scanning of implicit "
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"dependencies of an input file. The language given specifies the "
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"programming language whose corresponding dependency scanner should "
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"be used. Currently only C and CXX language scanners are supported. "
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"The language has to be specified for every file in the "
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"IMPLICIT_DEPENDS list. "
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"Dependencies discovered from the scanning are added to those of "
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"the custom command at build time. Note that the IMPLICIT_DEPENDS "
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"option is currently supported only for Makefile generators and "
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"will be ignored by other generators."
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"\n"
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"If COMMAND specifies an executable target (created by "
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"ADD_EXECUTABLE) it will automatically be replaced by the location "
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"of the executable created at build time. Additionally a "
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"target-level dependency will be added so that the executable target "
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"will be built before any target using this custom command. However "
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"this does NOT add a file-level dependency that would cause the "
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"custom command to re-run whenever the executable is recompiled."
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"\n"
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"Arguments to COMMAND may use \"generator expressions\" with the "
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"syntax \"$<...>\". "
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CM_DOCUMENT_COMMAND_GENERATOR_EXPRESSIONS
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"References to target names in generator expressions imply "
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"target-level dependencies, but NOT file-level dependencies. "
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"List target names with the DEPENDS option to add file dependencies."
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"\n"
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"The DEPENDS option specifies files on which the command depends. "
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"If any dependency is an OUTPUT of another custom command in the "
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"same directory (CMakeLists.txt file) CMake automatically brings the "
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"other custom command into the target in which this command is built. "
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"If DEPENDS is not specified the command will run whenever the OUTPUT "
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"is missing; if the command does not actually create the OUTPUT then "
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"the rule will always run. "
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"If DEPENDS specifies any target (created by an ADD_* command) "
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"a target-level dependency is created to make sure the target is "
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"built before any target using this custom command. Additionally, "
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"if the target is an executable or library a file-level dependency "
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"is created to cause the custom command to re-run whenever the target "
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"is recompiled.\n"
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;
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}
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cmTypeMacro(cmAddCustomCommandCommand, cmCommand);
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protected:
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bool CheckOutputs(const std::vector<std::string>& outputs);
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};
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#endif
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