The following issue has been SUBMITTED.
======================================================================
http://public.kitware.com/Bug/view.php?id=14948
======================================================================
Reported By: thokra
Assigned To:
======================================================================
Project: CMake
Issue ID: 14948
Category: CMake
Reproducibility: always
Severity: major
Priority: normal
Status: new
======================================================================
Date Submitted: 2014-06-03 06:42 EDT
Last Modified: 2014-06-03 06:42 EDT
======================================================================
Summary: list() command does not work universally on
implicitly defined lists (ARGN inside function)
Description:
While optimizing a large CMake based project I came across a problem involving
lists and sub-commands of the list() command.
Suppose we have a
macro(some_macro mandatoryArg [opt1[opt2...]])
to which we pass a large list of files and, sub-optimally, copy the entire list
via
set(newList ${ARGN})
so we are able to further process the resulting list using the list() command.
This, depending on the current amount of entries, is obviously a costly
operation which we want to get rid of. Also, we need to sort the list afterwards
so the logical step is to invoke
list(SORT newList)
This all works, but seems unnecessary because we could just as well use a
function and process ARGN directly.
The problem is that some list() sub-commands work properly and others don't. For
instance, determining the length of the list using
list(LENGTH ARGN len)
works.
list(SORT ARGN) however
generates an error message that the second argument needs to be a list. Using
the above macro leads to, AFAICT, correct error messages being generated by
either sub-command.
I suppose the above is not intentional.
Steps to Reproduce:
macro(some_macro ARG1)
list(LENGTH ARGN len) # generates an error
message("Length: " ${len})
list(SORT ARGN) # generates an error
endmacro()
function(some_func ARG1)
list(LENGTH ARGN len)
message("Length: " ${len}) # reports the correct size of ARGN
list(SORT ARGN) # generates an error, ARGN supposedly not a list
endfunction()
======================================================================
Issue History
Date Modified Username Field Change
======================================================================
2014-06-03 06:42 thokra New Issue
======================================================================
--
Powered by www.kitware.com
Please keep messages on-topic and check the CMake FAQ at:
http://www.cmake.org/Wiki/CMake_FAQ
Kitware offers various services to support the CMake community. For more
information on each offering, please visit:
CMake Support: http://cmake.org/cmake/help/support.html
CMake Consulting: http://cmake.org/cmake/help/consulting.html
CMake Training Courses: http://cmake.org/cmake/help/training.html
Visit other Kitware open-source projects at
http://www.kitware.com/opensource/opensource.html
Follow this link to subscribe/unsubscribe:
http://public.kitware.com/cgi-bin/mailman/listinfo/cmake-developers
