Alan W. Irwin wrote:
On 2007-02-24 12:03-0800 Alan W. Irwin wrote:
I have now learned that the GNAT compiler is simply and add-on to gcc, and
in fact all the low-level compilations of Ada source in the GNAT case are
done by gcc. Also, Ada keeps track of dependency issues for itself so the
high-level gnatmake command can be used as a front-end to gcc with all
compilations done only when needed.
For example, in a simple case with no dependencies
gnatmake -c -fPIC plplot.adb
results in running
gcc -c -fPIC plplot.adb
which compiles that ada source into plplot.o. (A plplot.ali file is
created as well to help keep track of Ada dependencies, but that can be
ignored as far as CMake is concerned.) To build a library of the results
you use the gcc command as normal, e.g.,
gcc -shared -FPIC plplot.o -o libplplotada.so.0.0.0
I currently handle all of this with custom commands that are suitable just
for Linux shared libraries. I could add other platforms and deal with
the question of static libraries on all platforms as well. However, this
seems like "reinventing the wheel".
Thus, I would like to do
add_library(plplotada plplot.adb)
instead without worrying about custom commands, the question of static or
shared libraries, or cross-platform issues (the gnat variation of the gcc
compiler is also available on Mac OS X and windows):
In order for the add_library command to work, I need to modify CMake (or
CMake modules or variables) so that
* gnatmake is temporarily considered as the gcc compiler (note it takes
the usual -c and -fPIC options of gcc since it is just a front-end for
an ada-enabled version of gcc.)
* *.adb files are considered to be "C" source. (When I tried the add_library
approach, cmake complained that the language could not be recognized. Is this
a matter of simply telling CMake that the ".adb" suffix is acceptable to gcc
for compilation?
Can somebody tell me how to arrange the above modifications? Note, gcc
should be kept as the linker command.
In Modules directory there is a file with instructions on how to add a new
language to cmake.
http://public.kitware.com/cgi-bin/viewcvs.cgi/Modules/CMakeAddNewLanguage.txt?rev=1.1.2.1&root=CMake&view=markup
--
Filipe Sousa
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