(0002956)
Brad King (manager)
2005-08-24 19:09

One way to do this is to add a DEPENDS_SCANNER option to ADD_CUSTOM_COMMAND:

ADD_CUSTOM_COMMAND(
  OUTPUT myoutput.txt
  COMMAND mycmd myinput.txt myoutput.txt
  DEPENDS_SCANNER mydep myinput.txt
  )

This should be straightforward to implement for the Makefile generator: When CMake scans the dependencies of the target in which myoutput.txt is used it will run the given command line to actually do the scanning. The command will have to display dependencies to standard output or put them in some standard file. Then the CMake scanner will parse this output and use it to write dependencies into the proper part of the generated Makefile.

This could be very tricky to implement for project file generators. The feature effectively can change the dependencies during the build, especially if the input to custom dependency scanning is itself a generated file. We may need a hack such as that in GCCXML_CREATE_XML_FILE mentioned in bug 0001731.

NOTE: Bugs 0001731 and 0001740 will be solved with this feature.

(0004515)
James Bigler (developer)
2006-07-20 13:23

I'm still struggling with the SWIG dependecies (header files change, but my interface is not regenerated). Is the GCCXML_CREATE_XML_FILE the only way to do this?

(0010875)
Brad King (manager)
2008-03-20 18:08

CMake in CVS (and in the upcoming 2.6 release) supports an "IMPLICIT_DEPENDS" option in add_custom_command:

         add_custom_command(OUTPUT output1 [output2 ...]
                            COMMAND command1 [ARGS] [args1...]
                            [COMMAND command2 [ARGS] [args2...] ...]
                            [MAIN_DEPENDENCY depend]
                            [DEPENDS [depends...]]
                            [IMPLICIT_DEPENDS <lang1> depend1 ...]
                            [WORKING_DIRECTORY dir]
                            [COMMENT comment] [VERBATIM] [APPEND])

...

       The IMPLICIT_DEPENDS option requests scanning of implicit dependencies
       of an input file. The language given specifies the programming
       language whose corresponding dependency scanner should be used.
       Currently only C and CXX language scanners are supported.
       Dependencies discovered from the scanning are added to those of the
       custom command at build time. Note that the IMPLICIT_DEPENDS option
       is currently supported only for Makefile generators and will be
       ignored by other generators.

(0030483)
Brad King (manager)
2012-08-13 10:36

Sending issues I'm not actively working on to the backlog to await someone with time for them.

If an issue you care about is sent to the backlog when you feel it should have been addressed in a different manner, please bring it up on the CMake mailing list for discussion. Sign up for the mailing list here, if you're not already on it:

http://www.cmake.org/mailman/listinfo/cmake [^]

It's easy to re-activate a bug here if you can find a CMake developer or contributor who has the bandwidth to take it on.

(0037268)
Ben Robinson (reporter)
2014-11-24 13:35

I am attempting to convert a large SCONS based project to CMAKE. This project contains *.idl, *.sdl, and *.cdl files which include each-other, and therefore depend upon each-other. Of course, they produce *.cpp and *.h output files in an add_custom_command step. CMake is able to automatically manage the *.cpp -> *.Xdl dependencies, but not the *.Xdl -> *.Xdl dependencies.

It would elegantly solve my problem to add DEPENDS_SCANNER option to the custom command, where I could give the shell command to parse the *.Xdl files and generate their dependencies, in a format CMake could parse.

(0041298)
Kitware Robot (administrator)
2016-06-10 14:27

Resolving issue as `moved`.

This issue tracker is no longer used. Further discussion of this issue may take place in the current CMake Issues page linked in the banner at the top of this page.

Issue History
Date Modified	Username	Field	Change
2008-03-20 18:01	Clinton Stimpson	Relationship added	related to 0005952
2008-03-20 18:08	Brad King	Note Added: 0010875
2012-08-13 10:36	Brad King	Status	assigned => backlog
2012-08-13 10:36	Brad King	Note Added: 0030483
2014-11-24 13:35	Ben Robinson	Note Added: 0037268
2016-06-10 14:27	Kitware Robot	Note Added: 0041298
2016-06-10 14:27	Kitware Robot	Status	backlog => resolved
2016-06-10 14:27	Kitware Robot	Resolution	open => moved
2016-06-10 14:30	Kitware Robot	Status	resolved => closed

Notes
(0002956) Brad King (manager) 2005-08-24 19:09	One way to do this is to add a DEPENDS_SCANNER option to ADD_CUSTOM_COMMAND: ADD_CUSTOM_COMMAND( OUTPUT myoutput.txt COMMAND mycmd myinput.txt myoutput.txt DEPENDS_SCANNER mydep myinput.txt ) This should be straightforward to implement for the Makefile generator: When CMake scans the dependencies of the target in which myoutput.txt is used it will run the given command line to actually do the scanning. The command will have to display dependencies to standard output or put them in some standard file. Then the CMake scanner will parse this output and use it to write dependencies into the proper part of the generated Makefile. This could be very tricky to implement for project file generators. The feature effectively can change the dependencies during the build, especially if the input to custom dependency scanning is itself a generated file. We may need a hack such as that in GCCXML_CREATE_XML_FILE mentioned in bug 0001731. NOTE: Bugs 0001731 and 0001740 will be solved with this feature.

(0004515) James Bigler (developer) 2006-07-20 13:23	I'm still struggling with the SWIG dependecies (header files change, but my interface is not regenerated). Is the GCCXML_CREATE_XML_FILE the only way to do this?

(0010875) Brad King (manager) 2008-03-20 18:08	CMake in CVS (and in the upcoming 2.6 release) supports an "IMPLICIT_DEPENDS" option in add_custom_command: add_custom_command(OUTPUT output1 [output2 ...] COMMAND command1 [ARGS] [args1...] [COMMAND command2 [ARGS] [args2...] ...] [MAIN_DEPENDENCY depend] [DEPENDS [depends...]] [IMPLICIT_DEPENDS <lang1> depend1 ...] [WORKING_DIRECTORY dir] [COMMENT comment] [VERBATIM] [APPEND]) ... The IMPLICIT_DEPENDS option requests scanning of implicit dependencies of an input file. The language given specifies the programming language whose corresponding dependency scanner should be used. Currently only C and CXX language scanners are supported. Dependencies discovered from the scanning are added to those of the custom command at build time. Note that the IMPLICIT_DEPENDS option is currently supported only for Makefile generators and will be ignored by other generators.

(0030483) Brad King (manager) 2012-08-13 10:36	Sending issues I'm not actively working on to the backlog to await someone with time for them. If an issue you care about is sent to the backlog when you feel it should have been addressed in a different manner, please bring it up on the CMake mailing list for discussion. Sign up for the mailing list here, if you're not already on it: http://www.cmake.org/mailman/listinfo/cmake [^] It's easy to re-activate a bug here if you can find a CMake developer or contributor who has the bandwidth to take it on.

(0037268) Ben Robinson (reporter) 2014-11-24 13:35	I am attempting to convert a large SCONS based project to CMAKE. This project contains .idl, .sdl, and .cdl files which include each-other, and therefore depend upon each-other. Of course, they produce .cpp and .h output files in an add_custom_command step. CMake is able to automatically manage the .cpp -> .Xdl dependencies, but not the .Xdl -> .Xdl dependencies. It would elegantly solve my problem to add DEPENDS_SCANNER option to the custom command, where I could give the shell command to parse the .Xdl files and generate their dependencies, in a format CMake could parse.

(0041298) Kitware Robot (administrator) 2016-06-10 14:27	Resolving issue as `moved`. This issue tracker is no longer used. Further discussion of this issue may take place in the current CMake Issues page linked in the banner at the top of this page.