[CMake] problems when upgrading to Xcode v5

[Jeff Schenck]

Hello,

I recently upgraded to Xcode v5 on Mac OSX and started getting build failures.  Below is a simplified project that produces the same problem, followed by the error message generated by Xcode.  The problem occurs with version v5 but not v4.6.x of Xcode.  I'm running CMake 2.8.10.2.

::::::::::::::::
CMakeLists.txt
::::::::::::::::
cmake_minimum_required ( VERSION 2.8.8 )

project( test )

add_library( a_obj OBJECT t1.c t2.c )
add_library( b_obj OBJECT t3.c t4.c )

add_library( a dummy.c $<TARGET_OBJECTS:a_obj> )
add_library( b dummy.c $<TARGET_OBJECTS:b_obj> )

add_executable( t t.c )
target_link_libraries( t a b )


::::::::::::::
t.c
::::::::::::::
#include <stdio.h>

int func1( int a );
int func2( int a );
int func3( int a );
int func4( int a );

int main()
{
    int a = 100;
    printf( "%d %d %d %d %d\n", a, func1(a), func2(a), func3(a), func4(a) );
    return 0;
}


::::::::::::::
t1.c
::::::::::::::
int func1( int a )
{
    return a*1;
}


::::::::::::::
t2.c
::::::::::::::
int func2( int a )
{
    return a*2;
}


::::::::::::::
t3.c
::::::::::::::
int func3( int a )
{
    return a*3;
}


::::::::::::::
t4.c
::::::::::::::
int func4( int a )
{
    return a*4;
}


dummy.c is empty


When I run CMake, no errors; running xcodebuild gives:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: can't open file: /Users/jschenck/TestBuild/test.build/Release/a_obj.build/Objects-normal/undefined_arch/t1.o (No such file or directory)
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: can't open file: /Users/jschenck/TestBuild/test.build/Release/a_obj.build/Objects-normal/undefined_arch/t2.o (No such file or directory)
Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool failed with exit code 1


The .o files can instead be found here:

$ find . -name t1.o
./test.build/Release/a_obj.build/Objects-normal/x86_64/t1.o


Thanks for your help.  (Sorry for not running this on the latest version of CMake, but I rolled back Xcode to an earlier version and now will have a hard time reproducing it.  If necessary, I can "upgrade" again.)

Regards,
Jeff Schenck


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