[CMake] Is there a way to omit relative path from the name of the comilation output file (<OBJECT>)?

[Michael Wild]

Apart from me not liking this setup (those external sources should  
probably be a separate project and be compiled as a library which then  
is imported) you could use
CONFIGURE_FILE(/long/path/to/file ${CMAKE_BINARY_DIR}/file COPYONLY)  
and then pass ${CMAKE_BINARY_DIR}/file to the add_executable/ 
add_library calls. You could also wrap the latter commands in custom  
macros/functions to scan a list of source files for out-of-source  
sources and the automatically copy them to the build tree.

Michael

On 30. Nov, 2009, at 16:53 , Alexander Tarnopolsky wrote:

> Dear CMake users list,
>
> In our build system we have to compile source files that reside out of
> source/build tree. In some cases there are several hundreds of such
> "external" sources in a project.
>
> Consider simplified CMakeLists.txt:
> ===================================
> Project (system)
>
> set(SOURCES
> /users/gdadmin/PG41/project/src/library/system/AttachDebugger.cc
> /users/gdadmin/PG41/project/src/library/system/CPUInfo.cc
> DSOInfo.cc
> DSOManip.cc
> HelpControl.cc
> LocateExe.cc
> MksTemp.cc
> PathManip.cc
> PluginLoader.cc
> ProcessAffinity.cc
> RTTI.cc
> Setenv.cc
> ShellUtils.cc
> Sleep.cc
> SysTime.cc
> TraceStack.cc
> UserInfo.cc
> VTControl.cc
> Asm/CPUID_c.cc
> )
>
> add_library (system SHARED ${SOURCES})
> =======================================
>
> The compilation of the first source produces the following output  
> file:
> "CMakeFiles/system.dir/users/gdadmin/PG41/project/src/library/system/ 
> Att
> achDebugger.cc.o"
>
> Imagine a link command where several hundreds of object files are  
> listed
> with this relative path...
>
> Thus we are looking for a way to shorten the path. Ideally - we'd like
> to generate compiled objects under the same flat-directory  
> regardless of
> the source file location.
>
> I understand that ""CMakeFiles/system.dir" part of the relative path  
> to
> object files cannot be changed - I hope we can handle this.
>
> But is there a way to change
> "/users/gdadmin/PG41/project/src/library/system" part?
>
> I experimented with CMAKE_CXX_COMPILE_OBJECT rule-variable and tried  
> to
> replace the <OBJECT> with something else, but apparently the
> rule-command is invoked always when <OBJECT> file is missing, probably
> the dependency between <OBJECT> and <SOURCE> drives the rule-command.
>
> Of course there is a possibility to compile objects by a custom  
> command
> and to manage object's dependencies by a script etc.. However we don't
> like to give up on cmake built-in rules for compilation and dependency
> tracking.
>
> Thanks in advance for your help,
> Kind Regards,
> Alex Tarnopolsky
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