README.Porting
author Sam Lantinga <slouken@libsdl.org>
Fri, 28 Sep 2012 03:18:18 -0700
changeset 6491 03b7e6b0a8bf
parent 1946 103760c3a5dc
child 6987 7084af936d82
permissions -rw-r--r--
Fixed bug 1587 - "aclocal" fails to generate a sufficient "aclocal.m4"

Cecil Curry 2012-08-27 16:55:12 PDT

Allow "aclocal" to find the "AC_CHECK_DEFINE" macro.

On running:

rm aclocal.m4
libtoolize --install --copy --force
aclocal -I acinclude
autoconf -I acinclude

The former three commands succeed, but "autoconf" fails with:

configure.in:198: error: possibly undefined macro: AC_CHECK_DEFINE
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.

"aclocal" fails to find AC_CHECK_DEFINE and hence add such macro to
"aclocal.m4". Here is why:

* "acinclude/ac_check_define.m4" defines AC_CHECK_DEFINE via define() rather
than AC_DEFUN().
* "aclocal" fails to find macros defined via define().
     1 
     2 * Porting To A New Platform
     3 
     4   The first thing you have to do when porting to a new platform, is look at
     5 include/SDL_platform.h and create an entry there for your operating system.
     6 The standard format is __PLATFORM__, where PLATFORM is the name of the OS.
     7 Ideally SDL_platform.h will be able to auto-detect the system it's building
     8 on based on C preprocessor symbols.
     9 
    10 There are two basic ways of building SDL at the moment:
    11 
    12 1. The "UNIX" way:  ./configure; make; make install
    13 
    14    If you have a GNUish system, then you might try this.  Edit configure.in,
    15    take a look at the large section labelled:
    16 	"Set up the configuration based on the target platform!"
    17    Add a section for your platform, and then re-run autogen.sh and build!
    18 
    19 2. Using an IDE:
    20 
    21    If you're using an IDE or other non-configure build system, you'll probably
    22    want to create a custom SDL_config.h for your platform.  Edit SDL_config.h,
    23    add a section for your platform, and create a custom SDL_config_{platform}.h,
    24    based on SDL_config.h.minimal and SDL_config.h.in
    25 
    26    Add the top level include directory to the header search path, and then add
    27    the following sources to the project:
    28 	src/*.c
    29 	src/audio/*.c
    30 	src/cdrom/*.c
    31 	src/cpuinfo/*.c
    32 	src/events/*.c
    33 	src/file/*.c
    34 	src/joystick/*.c
    35 	src/stdlib/*.c
    36 	src/thread/*.c
    37 	src/timer/*.c
    38 	src/video/*.c
    39 	src/audio/disk/*.c
    40 	src/audio/dummy/*.c
    41 	src/video/dummy/*.c
    42 	src/joystick/dummy/*.c
    43 	src/cdrom/dummy/*.c
    44 	src/thread/generic/*.c
    45 	src/timer/dummy/*.c
    46 	src/loadso/dummy/*.c
    47 
    48 
    49 Once you have a working library without any drivers, you can go back to each
    50 of the major subsystems and start implementing drivers for your platform.
    51 
    52 If you have any questions, don't hesitate to ask on the SDL mailing list:
    53 	http://www.libsdl.org/mailing-list.php
    54 
    55 Enjoy!
    56 	Sam Lantinga				(slouken@libsdl.org)
    57