[CMake] Ninja fails, Make succeeds...

Mikael Lyngvig mikael at lyngvig.org
Tue Jun 26 19:26:47 EDT 2012 

Sigh, now I sent you the code from the wrong directory, but the code for
the "Backend" component is virtually identical.  I don't know how to use
functions with CMake, so I simply made a verbatim copy of the below code in
each subfolder and edited it to match the subfolder.  So the Backend
project looks like this:

project(Backend)

set(PublicHeaders
    "Backend.hpp"
    "Context.hpp"
)
set(PublishedHeaders "")
foreach(Header IN LISTS PublicHeaders)
    get_filename_component(HeaderFilename "${Header}" NAME)
    set(Source "${CMAKE_CURRENT_SOURCE_DIR}/${Header}")
    set(Output "${CMAKE_CURRENT_BINARY_DIR}/${HeaderFilename}")
    list(APPEND PublishedHeaders "${Output}")
    add_custom_command(
        OUTPUT "${Output}"
        COMMAND "${CMAKE_COMMAND}" -E copy_if_different "${Source}" "${Output}"
        MAIN_DEPENDENCY "${Source}"
        COMMENT "Publishing ${HeaderFilename}"
        VERBATIM
    )
endforeach()
add_custom_target(
    publish_backend_headers
    ALL
    DEPENDS ${PublishedHeaders}
    SOURCES ${PublicHeaders}
)
include_directories("${CMAKE_BINARY_DIR}/../")
include_directories("$ENV{LLVM}/include")

add_definitions(-D__STDC_CONSTANT_MACROS)
add_definitions(-D__STDC_LIMIT_MACROS)

add_library(Backend
    "Backend.cpp"
)

add_dependencies(Backend publish_backend_headers)



2012/6/27 Mikael Lyngvig <mikael at lyngvig.org>

> Here goes:
>
> project(Driver)
>
> set(PublicHeaders
>     "Driver.hpp"
>     "Setup.hpp"
> )
> set(PublishedHeaders "")
> foreach(Header IN LISTS PublicHeaders)
>     get_filename_component(HeaderFilename "${Header}" NAME)
>     set(Source "${CMAKE_CURRENT_SOURCE_DIR}/${Header}")
>     set(Output "${CMAKE_CURRENT_BINARY_DIR}/${HeaderFilename}")
>     list(APPEND PublishedHeaders "${Output}")
>     add_custom_command(
>         OUTPUT "${Output}"
>         COMMAND "${CMAKE_COMMAND}" -E copy_if_different "${Source}" "${Output}"
>         MAIN_DEPENDENCY "${Source}"
>         COMMENT "Publishing ${HeaderFilename}"
>         VERBATIM
>     )
> endforeach()
> add_custom_target(
>     publish_driver_headers
>     ALL
>     DEPENDS ${PublishedHeaders}
>     SOURCES ${PublicHeaders}
> )
>
> And then I have an additional:
>
> add_dependencies(Driver publish_driver_headers)
>
>
> Cheers,
> Mikael
>
> 2012/6/27 David Cole <david.cole at kitware.com>
>
>> On Tue, Jun 26, 2012 at 6:40 PM, Mikael Lyngvig <mikael at lyngvig.org>
>> wrote:
>> > Ohh, sorry.  Ninja says:
>> >
>> > [117/325] Building CXX object
>> Driver/CMakeFiles/Driver.dir/Driver.cpp.obj
>> > FAILED: c:\Mingw64\bin\c++.exe   -DNDEBUG
>> > -DBR0_BUILD_ASSERT=BR0_BUILD_ASSERT_DELETE
>> > -DBR0_BUILD_CHARSET=BR0_BUILD_CHARSET_ASCII
>> > -DBR0_BUILD_ENDIAN=BR0_BUILD_ENDIAN_LITTLE
>> > -DBR0_BUILD_MODE=BR0_BUILD_MODE_SHIP
>> > -DBR0_BUILD_TARGET=BR0_BUILD_TARGET_WINDOWS -Wall -Wno-long-long
>> -pedantic
>> > -I.. -Ic:/Synology/clang-3.2-WIN64/include    -static-libgcc -MMD -MT
>> > Driver/CMakeFiles/Driver.dir/Driver.cpp.obj -MF
>> > "Driver/CMakeFiles/Driver.dir/Driver.cpp.obj.d" -o
>> > Driver/CMakeFiles/Driver.dir/Driver.cpp.obj -c
>> > C:/Dropbox/Source/braceless/src/Driver/Driver.cpp
>> > C:/Dropbox/Source/braceless/src/Driver/Driver.cpp:11:42: fatal error:
>> > Braceless0/Backend/Backend.hpp: No such file or directory
>> > compilation terminated.
>> > [117/325] Building CXX object Driver/CMakeFiles/Driver.dir/Setup.cpp.obj
>> > ninja: build stopped: subcommand failed.
>> >
>> > The problem is that the file Driver.cpp depends on Backend.hpp having
>> been
>> > created.  But Driver.cpp should not be compiled until the second-last
>> item
>> > in the list of objects to make ([324/325]).
>> >
>> > So, somehow, Ninja picks up the target Driver.obj and builds it way too
>> > early.  With GNU Make, everything goes according to plan, but with
>> Ninja,
>> > there's some sort of confusion somewhere.
>> >
>> >
>> > Cheers,
>> > Mikael
>> >
>> > 2012/6/27 David Cole <david.cole at kitware.com>
>> >>
>> >> On Tue, Jun 26, 2012 at 6:30 PM, Mikael Lyngvig <mikael at lyngvig.org>
>> >> wrote:
>> >> > No, I delete the entire build tree (I build out of the source tree,
>> >> > btw).
>> >> >
>> >> > The procedure is as follows:
>> >> >
>> >> >    rem foo contains the source code
>> >> >    md foo-build
>> >> >    cd foo-build
>> >> >    cmake -G Ninja ..\foo
>> >> >    ninja
>> >> >    rem fails as described earlier
>> >>
>> >>
>> >> But you didn't really describe the failure.
>> >>
>> >> What is the error output? (from cmake or from ninja?)
>> >>
>> >>
>> >> >
>> >> >     cd ..
>> >> >     rd /s /q foo-build
>> >> >     md foo-build
>> >> >     cd foo-build
>> >> >     cmake -G "MinGW Makefiles" ..\foo
>> >> >     make
>> >> >     rem succeeds as described earlier
>> >> >
>> >> > Thank you for your reply.  If you need source, I can send you a zip
>> >> > archive
>> >> > as it is an incomplete open source project.
>> >> >
>> >> >
>> >> > Cheers,
>> >> > Mikael
>> >> >
>> >> >
>> >> > 2012/6/27 David Cole <david.cole at kitware.com>
>> >> >>
>> >> >> You can't switch generators in the same build tree without deleting
>> >> >> absolutely everything and starting over.
>> >> >>
>> >> >> Is that what you're trying to do?
>> >> >>
>> >> >> If you want a make build tree and a ninja build tree, you'll need
>> two
>> >> >> separate build trees....
>> >> >>
>> >> >>
>> >> >> HTH,
>> >> >> David
>> >> >>
>> >> >>
>> >> >> On Tue, Jun 26, 2012 at 4:45 PM, Mikael Lyngvig <mikael at lyngvig.org
>> >
>> >> >> wrote:
>> >> >> > Hi,
>> >> >> >
>> >> >> > I am a fan of Ninja.  Since I started using it, everything's been
>> >> >> > built
>> >> >> > much, much faster than before.  Among other things because I use
>> >> >> > CMake
>> >> >> > to
>> >> >> > publish headers to the binary directory so as to allow me to
>> include
>> >> >> > the
>> >> >> > headers with a relative path without having to move all my
>> headers to
>> >> >> > a
>> >> >> > central include directory (I want my source files and headers to
>> be
>> >> >> > in
>> >> >> > the
>> >> >> > same directory).  Ninja does this very fast, whereas GNU Make
>> takes
>> >> >> > forever
>> >> >> > to publish my header files.
>> >> >> >
>> >> >> > However, I have a puzzling problem: Out of the blue, Ninja started
>> >> >> > failing
>> >> >> > to build my project.  If I remake the project with 'cmake -G
>> "MinGW
>> >> >> > Makefiles"', it takes ages to build but it succeeds.  If I do
>> 'cmake
>> >> >> > -G
>> >> >> > Ninja', it quickly aborts because it seems that either CMake or
>> Ninja
>> >> >> > wants
>> >> >> > to build one of the last targets at a very early point in the
>> build
>> >> >> > phase.
>> >> >> >  I have an executable, driver.exe, which is supposed to be built
>> as
>> >> >> > the
>> >> >> > very
>> >> >> > last item.  With Ninja, however, it pops up around 20 percent into
>> >> >> > the
>> >> >> > build
>> >> >> > and the build fails because the dependent libraries are nowhere
>> to be
>> >> >> > found
>> >> >> > (they haven't been built yet).  I have tried clearing the binaries
>> >> >> > directory
>> >> >> > (rd /s /q foo & md foo) and so on a number of times, but Ninja
>> >> >> > insists
>> >> >> > on
>> >> >> > trying to build this final executable at a very early stage.
>> >> >> >
>> >> >> > Any ideas?  I suppose the problem is caused by one of these three
>> >> >> > things:
>> >> >> >
>> >> >> >    1. An error on my part.  Very likely.
>> >> >> >    2. An error in CMake's generation of Ninja scripts.  Not
>> unlikely
>> >> >> > due
>> >> >> > to
>> >> >> > the still fairly immature support for Ninja.
>> >> >> >    3. An error in Ninja.  Highly unlikely as Ninja builds tons and
>> >> >> > tons
>> >> >> > of
>> >> >> > projects all over the world each day and nobody seem to have run
>> into
>> >> >> > this
>> >> >> > problem before.
>> >> >> >
>> >> >> > How do you locate the problem?
>> >> >> >
>> >> >> > Thanks in advance!
>> >> >> >
>> >> >> >
>> >> >> > Cheers,
>> >> >> > Mikael
>> >> >> > -- Love Thy Frog!
>> >> >> >
>> >> >> > --
>> >> >> >
>> >> >> > Powered by www.kitware.com
>> >> >> >
>> >> >> > Visit other Kitware open-source projects at
>> >> >> > http://www.kitware.com/opensource/opensource.html
>> >> >> >
>> >> >> > Please keep messages on-topic and check the CMake FAQ at:
>> >> >> > http://www.cmake.org/Wiki/CMake_FAQ
>> >> >> >
>> >> >> > Follow this link to subscribe/unsubscribe:
>> >> >> > http://www.cmake.org/mailman/listinfo/cmake
>> >> >
>> >> >
>> >
>> >
>>
>> What does your add_custom_command look like that generates Backend.hpp?
>>
>> (offline for a while, next response much later... :-)
>>
>
>
>
> --
> -- Love Thy Frog!
>



-- 
-- Love Thy Frog!
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