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RazZziel

Member

From: Spain

Registered: 2007-07-13

Posts: 36

Making CMake dance for me

Hi, I'm working on ap project that users inotify.h, a module that is included in recent versions of glibc, but for example not in Debian Etch.

The thing is, in any modern distro I'd have to include sys/inotify.h, while in etch I have to include inotifytools/inotify.h. I've managed to do it in CMake with CHECK_INCLUDE_FILES and a config.h, but I found a cleaner solution that should work in theory but actually doesn't, for me:

src/CMakeList.txt

SET(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake_modules/")

FIND_PACKAGE(Inotify REQUIRED)
IF(INOTIFY_FOUND)
  INCLUDE_DIRECTORIES( ${INOTIFY_INCLUDE_DIR} )
ENDIF(INOTIFY_FOUND)

cmake_modules/FindInotify.cmake

IF (INOTIFY_FOUND)
  IF (NOT Inotify_FIND_QUIETLY)
    MESSAGE(STATUS "Found Inotify: ${INOTIFY_INCLUDE_DIR}")
  ENDIF (NOT Inotify_FIND_QUIETLY)
ELSE (INOTIFY_FOUND)
  IF (Inotify_FIND_REQUIRED)
    MESSAGE(FATAL_ERROR "Could not find Inotify")
  ENDIF (Inotify_FIND_REQUIRED)
ENDIF (INOTIFY_FOUND)

#INCLUDE(CheckIncludeFiles)
#CHECK_INCLUDE_FILES(sys/inotify.h HAVE_SYS_INOTIFY_H2)
#CHECK_INCLUDE_FILES(inotifytools/inotify.h HAVE_INOTIFYTOOLS_INOTIFY_H2)
INCLUDE_DIRECTORIES( ${INOTIFY_INCLUDE_DIR} ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR} )

So, when I get the correct inotify path I get it into my include dirs, but if CMake can't find it gives an error. This should work, but how do I include inotify.h in my source? #include <inotify.h> or "inotify.h" doesn't seem to work.

Also, I've tried compiling this with plain g++, and I get a very weird error:

[raziel@Bebop klikd]$ g++ -I/usr/include/sys src/*.cpp -lpthread -lrt
In file included from /usr/include/sys/signal.h:1,
                 from /usr/include/sys/signal.h:1,
                 from /usr/include/sys/signal.h:1,
                 from /usr/include/sys/signal.h:1,
                 from /usr/include/sys/signal.h:1,
                 from /usr/include/sys/signal.h:1,

(...)
/usr/include/sys/signal.h:1:20: error: #include nested too deeply
In file included from /usr/include/sys/unistd.h:1,
                 from /usr/include/sys/unistd.h:1,
                 from /usr/include/sys/unistd.h:1,
                 from /usr/include/sys/unistd.h:1,
                 from /usr/include/sys/unistd.h:1,
(...)

Being:

[raziel@Bebop klikd]$ cat /usr/include/sys/signal.h
#include <signal.h>
[raziel@Bebop klikd]$ cat /usr/include/sys/unistd.h
#include <unistd.h>

Is this normal?

train

Member

Registered: 2007-03-17

Posts: 38

Re: Making CMake dance for me

I checked the files on my system. They contain exactly the same as yours. I suggest you use the include files in /usr/include, rather than /usr/include/sys.

No experience in using cmake.

RazZziel

Member

From: Spain

Registered: 2007-07-13

Posts: 36

Re: Making CMake dance for me

That's that I want to avoid, as in debian etch they don't have /usr/include/sys/inotify.h, they have /usr/sys/inotifytools/inotify.h