Hi François, Would the use of function be helpful ?
See http://www.cmake.org/cmake/help/cmake-2-8-docs.html#command:function and http://www.cmake.org/cmake/help/cmake-2-8-docs.html#command:set "If PARENT_SCOPE is present, the variable will be set in the scope above the current scope. Each new directory or function creates a new scope. This command will set the value of a variable into the parent directory or calling function (whichever is applicable to the case at hand)." I created a small example showing that variable set within a function don't interfere with the parent scope if not explicitly required. git clone git://gist.github.com/1888836.git cmake -P 1888836/cmake-illustrate-function-scope.cmake Hth Jc On Wed, Feb 22, 2012 at 7:07 PM, François Mauger <mau...@lpccaen.in2p3.fr>wrote: > Hi CMakers, > > In november 2007, there was a long thread titled "lexical scoping". > The discussion was really interesting and was suggesting that some > "local scoping" features for variables could be implemented in CMake... > particularly from macros, which are probably the practical case that > causes most issues when users implement several nested levels of macro > invocations with many intermediate temporary variables that unfortunately > aggregate in the global scope. It is really easy to face such problem in a > rather large project driven with Cmake (a dependency driver invoking the > find_package command in a foreach loop must be done from a macro AFAIK). > Unless I missed something in the jungle of CMake threads and doc, I'm > afraid I was not able to find some satisfactory solution other than hacks > (using very long variable names to "emulate" some pseudo local scopes). > this is tedious and bug prone. > > Browsing the last 4 years of archives and some additionnal docs, I was not > able to find a single trace of such new feature : implementing "local > scoping" in CMake (whatever "local scoping" could rationally mean). > > What is the current situation on users' side ? Is there any pressure for > "local scoping" ? Maybe too few people ask for it so CMake developpers do > not consider it as a priority... or no clear definition > of "local scoping" has been patterned ? > more what is the view of the CMake devel team ? do they consider this idea > as a good one or not ? > > Thanks a lot for hints and advices. > > Best regards > frc > -- > François Mauger > LPC Caen-CNRS/IN2P3-UCBN-ENSICAEN > Département de Physique -- Université de Caen Basse-Normandie > > -- > > Powered by www.kitware.com > > Visit other Kitware open-source projects at http://www.kitware.com/** > opensource/opensource.html<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<http://www.cmake.org/Wiki/CMake_FAQ> > > Follow this link to subscribe/unsubscribe: > http://www.cmake.org/mailman/**listinfo/cmake<http://www.cmake.org/mailman/listinfo/cmake> > -- +1 919 869 8849
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