[cmake-developers] Adding logic to CMake for -fPIE and -fPIC

[Stephen Kelly]

Brad King wrote:

> On 5/3/2012 12:02 PM, Stephen Kelly wrote:
>> * Make set(CMAKE_POSITION_INDEPENDENT_BINARIES True) set the appropriate
>> flags.
> 
> This is the right choice IMO, though the variable should just
> initialize a "POSITION_INDEPENDENT" target property.  The target
> property would then map to the right flag.  You'll need to factor
> out and generalize the CMAKE_SHARED_LIBRARY_${lang}_FLAGS platform
> information variable:
> 
>   
http://cmake.org/gitweb?p=cmake.git;a=blob;f=Modules/Compiler/GNU.cmake;hb=v2.8.8#l24
> 
> currently used to add -fPIC to compilation of objects in shared
> libraries.  Make its use based on the new property, and simply
> make the property true by default for shared libraries.
> 
> -Brad

Ok. Then factoring out how it is set is the first step. Looking at the 
output of 'git grep -i " \?pic\b"' and 'git grep -wi +Z', there are many 
different ways of telling the compiler that we want this property. Most of 
them are ancient unix which I can't test. Should I change those at all?

Thanks,

Steve.