[CMake] autoheader-like functionality?

[Michael Jackson]

Well luckily there are a whole slew of projects to take a look at.  
HDF5 is one. CMake, VTK, ITK, ParaView are some others. Basically you  
have a .cmake file that runs all the tests like looking for headers,  
structs, functions and stuff like that. Each result is put into a  
cmake variable. Then after all of that is completed you  
"configure_file(...)" using your .h.in file as input.

#  test.cmake example
# --------------------------------------------------------------------
#  Now check for needed Header files
# --------------------------------------------------------------------
INCLUDE (${CMAKE_ROOT}/Modules/CheckIncludeFile.cmake)
macro (CORE_CHECK_INCLUDE_FILE header var prefix)
     CHECK_INCLUDE_FILE("${header}"        ${prefix}_${var} )
endmacro()

CORE_CHECK_INCLUDE_FILE("stddef.h"        HAVE_STDDEF_H   MXA)
CORE_CHECK_INCLUDE_FILE("stdint.h"        HAVE_STDINT_H   MXA)
CORE_CHECK_INCLUDE_FILE("stdlib.h"        HAVE_STDLIB_H   MXA)
CORE_CHECK_INCLUDE_FILE("setjmp.h"        HAVE_SETJMP_H   MXA)
CORE_CHECK_INCLUDE_FILE("string.h"        HAVE_STRING_H   MXA)
CORE_CHECK_INCLUDE_FILE("stdio.h"         HAVE_STDIO_H   MXA)
CORE_CHECK_INCLUDE_FILE("math.h"          HAVE_MATH_H   MXA)
CORE_CHECK_INCLUDE_FILE("time.h"          HAVE_TIME_H   MXA)
CORE_CHECK_INCLUDE_FILE("sys/time.h"      HAVE_SYS_TIME_H   MXA)
CORE_CHECK_INCLUDE_FILE("sys/types.h"     HAVE_SYS_TYPES_H   MXA)
CORE_CHECK_INCLUDE_FILE("sys/socket.h"    HAVE_SYS_SOCKET_H   MXA)
CORE_CHECK_INCLUDE_FILE("sys/stat.h"      HAVE_SYS_STAT_H   MXA)
CORE_CHECK_INCLUDE_FILE("netinet/in.h"    HAVE_NETINET_IN_H   MXA)
CORE_CHECK_INCLUDE_FILE("arpa/inet.h"     HAVE_ARPA_INET_H   MXA)
CORE_CHECK_INCLUDE_FILE("unistd.h"        HAVE_UNISTD_H   MXA)
CORE_CHECK_INCLUDE_FILE("fcntl.h"         HAVE_FCNTL_H   MXA)
CORE_CHECK_INCLUDE_FILE("errno.h"         HAVE_ERRNO_H   MXA)

configure_file (Conf.h.in Conf.h @ONLY)
#--- End test.cmake file


// Example Conf.h.in file
/* Define to 1 if you have the <stddef.h> header file. */
#cmakedefine MXA_HAVE_STDDEF_H @MXA_HAVE_STDDEF_H@

/* Define to 1 if you have the <stdint.h> header file. */
#cmakedefine MXA_HAVE_STDINT_H @MXA_HAVE_STDINT_H@

/* Define to 1 if you have the <stdlib.h> header file. */
#cmakedefine MXA_HAVE_STDLIB_H @MXA_HAVE_STDLIB_H@

/* Define to 1 if you have the <setjmp.h> header file. */
#cmakedefine MXA_HAVE_SETJMP_H @MXA_HAVE_SETJMP_H@

/* Define to 1 if you have the <string.h> header file. */
#cmakedefine MXA_HAVE_STRING_H @MXA_HAVE_STRING_H@

/* Define to 1 if you have the <stdio.h> header file.  */
#cmakedefine MXA_HAVE_STDIO_H @MXA_HAVE_STDIO_H@

/* Define to 1 if you have the <math.h> header file.  */
#cmakedefine MXA_HAVE_MATH_H @MXA_HAVE_MATH_H@

/* Define to 1 if you have the <time.h> header file. */
#cmakedefine MXA_HAVE_TIME_H @MXA_HAVE_TIME_H@

/* Define to 1 if you have the <sys/time.h> header file. */
#cmakedefine MXA_HAVE_SYS_TIME_H @MXA_HAVE_SYS_TIME_H@

/* Define to 1 if you have the <sys/types.h> header file. */
#cmakedefine MXA_HAVE_SYS_TYPES_H @MXA_HAVE_SYS_TYPES_H@

/* Define to 1 if you have the <sys/socket.h> header file. */
#cmakedefine MXA_HAVE_SYS_SOCKET_H @MXA_HAVE_SYS_SOCKET_H@

/* Define to 1 if you have the <netinet/in.h> header file. */
#cmakedefine MXA_HAVE_NETINET_IN_H @MXA_HAVE_NETINET_IN_H@

/* Define to 1 if you have the <arpa/inet.h> header file. */
#cmakedefine MXA_HAVE_ARPA_INET_H @MXA_HAVE_ARPA_INET_H@

/* Define to 1 if you have the <unistd.h> header file. */
#cmakedefine MXA_HAVE_UNISTD_H @MXA_HAVE_UNISTD_H@

/* Define to 1 if you have the <fcntl.h> header file. */
#cmakedefine MXA_HAVE_FCNTL_H @MXA_HAVE_FCNTL_H@

/* Define to 1 if you have the <errno.h> header file. */
#cmakedefine MXA_HAVE_ERRNO_H @MXA_HAVE_ERRNO_H@


at least that is how I do it.
___________________________________________________________
Mike Jackson                      www.bluequartz.net
Principal Software Engineer       mike.jackson at bluequartz.net
BlueQuartz Software               Dayton, Ohio

On Jul 29, 2010, at 6:25 PM, Clifford Yapp wrote:

> I'm now at the point in writing CMake logic where I need to handle the
> config.h.in situation, and either have missed the autoheader
> equivalent functionality in CMake or it doesn't exist yet.  Can
> anybody point me to the "right" approach to this?  I have so-far
> found:
>
> The #cmakedefine mechanism and the various CHECK_* functions, which
> work fine but aren't autogenerated a.l.a autoheader
>
> A 2009 discussion about autoheader-style functionality:
> http://www.cmake.org/pipermail/cmake/2009-March/028293.html
> http://www.cmake.org/pipermail/cmake/2009-April/028417.html
>
> and a still-open item in the tracker from 2008:
> http://www.cmake.org/Bug/view.php?id=6438&nbn=1
>
> Has there been any recent work on this that I missed?  Our project has
> quite a slew of these #defines created by autoheader, most of which
> are apparently actually needed, so manually maintaining a list is
> gonna be a bit of a tough sell.
>
> Cheers, and any help appreciated,
>
> CY
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