On Thu, Nov 18, 2010 at 8:34 AM, Denis Scherbakov
<denis_scherba...@yahoo.com> wrote:
> Hi!
>
> What I mean is:
>
> PROJECT(MYPROJECT)
>
> ADD_CUSTOM_COMMAND( OUTPUT "${PROJECT_BINARY_DIR}/MyFile.hh" COMMAND
> ${CMAKE_COMMAND} -P MyScript.cmake)
>
> SET_SOURCE_FILE_PROPERTIES("${PROJECT_BINARY_DIR}/MyFile.hh" PROPERTIES
> GENERATED TRUE HEADER_FILE_ONLY TRUE)
>
> SET (MYPROJECT_SRCS
> MyFile.hh
> MyFile.cc
> )
>
> ADD_LIBRARY(MYLIB ${MYPROJECT_SRCS})
> ADD_LIBRARY(MYLIBpic ${MYPROJECT_SRCS})
> SET_TARGET_PROPERTIES(MYLIBpic PROPERTIES COMPILE_FLAGS "-FPIC -DPIC")
>
> $ gmake -j2 all
> ... MyFile.hh is written two times
>
> So far I understand two targets try to generate MyFile.hh at the same time
> and there is no way to tell one of them that the file is being built by
> someone else already.
>
> Denis
>
> --- On Thu, 11/18/10, Eric Noulard <eric.noul...@gmail.com> wrote:
>
>> From: Eric Noulard <eric.noul...@gmail.com>
>> Subject: Re: [CMake] Problems with parallel builds
>> To: "Denis Scherbakov" <denis_scherba...@yahoo.com>
>> Cc: cmake@cmake.org
>> Date: Thursday, November 18, 2010, 5:13 AM
>> 2010/11/18 Denis Scherbakov <denis_scherba...@yahoo.com>:
>> > Dear All,
>> >
>> > I am using CMake 2.8.1 on Linux x86. I have a project
>> that needs to be built two times. One with -fPIC, the other
>> - without. The project depends on header files that need to
>> be generated by an external script.
>> >
>> > When I build this project with several parallel jobs
>> (gmake -j5, for example) to my disappointment CMake calls
>> external script several times so at the end I get corrupted
>> header files.
>>
>> Could you give us the exact CMake rule/command you use to
>> generate
>> those headers?
>>
>> configure_file?
>> add_custom_command?
>> add_custom_target?
>> execute_process?
>> ... combination of those ?
>>
>> > Does anybody know a cross-platform way of implementing
>> a mutex (or something like that) to make sure that
>> > scripts that generate files are called only once?
>> >
>> > So far for me parallel builds do not work with CMake
>> at all.
>>
>> I did never had any trouble with parallel building with
>> CMake on Linux
>> with makefile generator so far.
>> For build host ranging from 1 processors to 4 processors
>> with various -j values.
>>
>> --
>> Erk
>> Membre de l'April - « promouvoir et défendre le logiciel
>> libre » -
>> http://www.april.org
>>
>
>
>
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The easiest way to make this work is to have a separate custom target
that depends on the output of the custom command, and then to have the
two libraries depend on that custom target with add_dependencies...
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