[GEM-dev] configure (again): call for testing....

[IOhannes m zmoelnig]

hi all

i have adapted günter's build system (and of course, overcomplicated 
things again ;-) :-( )
i have checked it into Gem/src and i do think it is ready for testing by 
now.

features:
  moved from src/Gnu to src
  checks work (e.g. for ARB-extensions)
  dependencies are generated on the fly (no need for Make.depend)
  source-files are generated on the fly (no need for Make.source)
  source-files containing white-spaces are ignored
  partial compilation support (e.g. skip openGL/ if you don't want it)
  usage of pkg-config
  automatic checking for apple-frameworks
  ...

caveats:
  i just _had_ to: add my own m4-code, esp. for package-detection (this 
is: per default use PKG_CHECK_MODULES, fall back to AC_CHECK_LIB
  ffmpeg-detection seems to work on my machines, but i am not sure 
whether it really does.
  GemLibs might be a bit ignored without manual tuning.

m4-features:
  added checks for flags supported by the compiler
  overcomplicated package-detection (see above: using PKG_CHECK_MODULES 
and as a fallback AC_CHECK_LIB)

m4-caveats:
  haven't found a way yet how to test for special linker flags.


file-layout:

src/acinclude.m4-(aclocal)->src/aclocal.m4-+
                                            |-(autoconf)-> src/configure
src/configure.ac---------------------------+

src/Make.config.in ---------------(./configure)-->src/Make.config

src/Base/config${KERN}.h.in --(./configure)-->src/Base/config${KERN}.h

with ${KERN} being $(uname -s) (Linux, Darwin,...)


src/Makefile
   includes src/Make.include
              includes src/Make.config
   master-makefile, cd's into subdirs and calls make there

src/Makefile.subdir
   includes src/Make.include
              includes src/Make.config
   makefile for subdirectories (called via "make -f ../Makefile.subdir")


both the old and the new build-system can live together (with the old 
build-system having files in src/*/ and the new one _only_ in src/)




in theory, you just need to check it out, cd to Gem/src and run "make"
everything (including aclocal.m4 and configure) should be built as needed.


would be great if someone could test it (at least on linux-flavours and 
osX; i fear w32 will not work out of the box, but who knows)

mfg.asd.r
IOhannes