[CMake] Ninja fails, Make succeeds...

[Mikael Lyngvig]

I need the files to be copied at build time, not a compile time: They are
files I am editing and I need the build system to export the files to the
binary directory tree whenever they are changed.

I know it looks stupid and probably is as well :-)  The reason is that when
the project is being used by clients, I want them to include each file as
follows (something which I use myself):

#include "Braceless/Frontend/Scanner.hpp"

And the only way I could figure out to get it working was by naming the
build directory "Braceless" and then do that thing I'm doing.  The project
is organized like this:

   src/AST
   src/Driver
   src/Frontend
   ...

And I want to be able to write "Braceless" in front so that it works also
when the header files and libraries have been installed on a system.  In
the LLVM system, they solve this problem by storing the headers in another
location than the source files - something I deeply loathe as it makes it
very difficult to search for strings and even to edit a given source file
and its header at the same time.

I'll try out your comments, but I don't see any way of getting rid of that
../.. construct.  By the way, I am a CMake newbie so I just did what I
could do to make it work somehow.


Cheers,
Mikael

2012/6/27 Rolf Eike Beer <eike at sf-mail.de>

> > 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
> >     )
>
> Why don't you simply use configure_file(... COPYONLY) here?
>
> > endforeach()
> > add_custom_target(
> >     publish_backend_headers
> >     ALL
> >     DEPENDS ${PublishedHeaders}
> >     SOURCES ${PublicHeaders}
> > )
> > include_directories("${CMAKE_BINARY_DIR}/../")
>
> This is almost certainly wrong. Guess my build dir is /tmp/foo, why on
> earth do you want to include /tmp? I could understand if it would be
> ${CMAKE_CURRENT_BINARY_DIR}/.. if you are in a subdirectory, but otherwise
> this is likely completely bogus.
>
> > include_directories("$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)
>
> I think you can avoid the whole add_custom_target/add_library by just
> writing
>
> add_library(Backend Backend.cpp ${PublishedHeaders})
>
> (Untested. May only reliably work if you use configure_file. ymmv).
>
> Eike
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