On 06/01/2010 09:57 PM, Michael Wild wrote:
>
> On 1. Jun, 2010, at 17:02 , Hariharan wrote:
>
>> I do use ADD_CUSTOM_COMMAND to generate the files, but the actual generation
>> is done by a different Perl script. In some cases, there is no direct
>> correlation between the name of the source file and the name of the
>> destination file; and the number of generated files is quite large. However,
>> assuming I could get a list of the generated files from the script, is there
>> any way I can use that information (can i set the sources to this, for
>> example) ?
>> This output would be the actual list of files that I need to compile.
The following gensrc.pl generates source files and prints their names:
foreach (1,2,3) {
open($f,">","src_$_.c");
print $f "void f_$_(void){}\n";
close($f);
print "src_$_.c ";
}
print "\n";
The following CMakeLists.txt
CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
PROJECT(GENSRC C)
EXECUTE_PROCESS(
COMMAND perl ${CMAKE_SOURCE_DIR}/gensrc.pl
OUTPUT_VARIABLE GENSRCS
OUTPUT_STRIP_TRAILING_WHITESPACE
)
SEPARATE_ARGUMENTS(GENSRCS)
ADD_LIBRARY(gensrc ${GENSRCS})
executes gensrc.pl at configure time, collects the source files and uses
them to build a library. Perhaps, this suits your needs, but take heed
of MW's advice: If the generated files change you must reconfigure,
regenerate and rebuild; the latter by itself is not sufficient.
Possibly, you can go one step further:
CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
PROJECT(GENSRC C)
EXECUTE_PROCESS(
COMMAND perl ${CMAKE_SOURCE_DIR}/gensrc.pl
OUTPUT_VARIABLE GENSRCS
OUTPUT_STRIP_TRAILING_WHITESPACE
)
SEPARATE_ARGUMENTS(GENSRCS)
ADD_LIBRARY(gensrc ${GENSRCS} timestamp)
EXECUTE_PROCESS(COMMAND ${CMAKE_COMMAND} -E touch timestamp)
ADD_CUSTOM_COMMAND(
OUTPUT timestamp
COMMAND ${CMAKE_COMMAND} .
COMMAND ${CMAKE_COMMAND} --build .
DEPENDS gensrc.pl
)
Here, you have an additional dependency of the project's target on a
file just recording a timestamp at configure time. Furthermore, this
timestamp file depends on gensrc.pl, and the associated custom command
reconfigures, regenerates and rebuilds the project; thus, touching the
timestamp file by the way. If gensrc.pl, i.e. the set of the generated
files, changes a simple "make" has the project reconfigure, regenerate
and rebuild, and obviously, one could have further dependencies of the
timestamp file, e.g. on input data to gensrc.pl. For the time being, I
have seen this appoach working for *nix Makefiles, but I don't know if
it's suitable w.r.t. other generators. Moreover, I'm in doubt if it
could be denoted as a clean solution.
Regards,
Michael
_______________________________________________
Powered by www.kitware.com
Visit other Kitware open-source projects at
http://www.kitware.com/opensource/opensource.html
Please keep messages on-topic and check the CMake FAQ at:
http://www.cmake.org/Wiki/CMake_FAQ
Follow this link to subscribe/unsubscribe:
http://www.cmake.org/mailman/listinfo/cmake
