[CMake] Creating static executables

[Ajay Divekar]

I tried the following in my CMakeLists.txt file.

SET (CMAKE_EXE_LINK_DYNAMIC_C_FLAGS "-Wl,-Bstatic")
SET_TARGET_PROPERTIES (xxxx PROPERTIES LINK_FLAGS "-L/usr/local/lib/  
-L/usr/lib")

I have checked that libc.a and libm.a exists in the /usr/lib directory. I am 
currently using FreeBSD5.5. When I compile and ldd the executable I get
        libstdc++.so.4 => /usr/lib/libstdc++.so.4 (0x280e6000)
        libm.so.3 => /lib/libm.so.3 (0x281bc000)
        libc.so.5 => /lib/libc.so.5 (0x281d7000)


If I copy the libc.a and libm.a to another directory say /home/alex/libs and 
then include 
SET_TARGET_PROPERTIES (xxxx PROPERTIES LINK_FLAGS "-L/usr/local/lib/  
-L/home/alex/libs")

The executable created is a purely static executable. I cannot explain this?


 ALso when I try to take these sources and compile it on FreeBSD 6.2 using the 
same Cmake Files I get on doing ldd on the executable

libstdc++.so.6=> /usr/local/lib/gcc/i386-portbld-freebsd6.2/3.4.6/libstdc++.so.6 
libgcc_s.so.1=> /usr/local/lib/gcc/i386-portbld-freebsd6.2/3.4.6/libgcc_s.so.1       
libm.so.4 => /lib/libm.so.4 (0x28223000)
libc.so.6 => /lib/libc.so.6 (0x28239000)

the difference is that gcc is linked as shared library on BSD6.2 whereas on 
BSD5.5 it was static. Please someone explain. 

Regards,

Ajay


BTW I am using CMake 2.4.6





On Sunday 10 June 2007 10:20, Bill Hoffman wrote:
> Alan W. Irwin wrote:
> > On 2007-06-09 10:22+0400 Nikita V. Borodikhin wrote:
> >>> I frankly don't understand why that failed to work.  Completely static
> >>> executables are possible with cmake. I know this because I made one
> >>> several
> >>> months ago as a temporary experiment.
> >>
> >> They _were_ possible but on cmake >= 2.4.4 they are no longer possible
> >> without setting some variables in CMakeLists.txt (not command line!).
> >>
> >> Details: http://www.cmake.org/Bug/bug.php?op=show&bugid=5087&pos=13
> >
> > Ouch!  That issue is perhaps not something that most Linux users will run
> > into every day (very few build static executables any more), but static
> > builds are really fundamental.  Therefore, for the reputation of CMake, I
> > hope a CMake developer will be able to fix bug 5087 before 2.4.7.
> > This should
> > not take much time since it looks like Nikita has pinpointed where the
> > error occurs in his bug report.
>
> So, there is a new work around for this problem.  If you set this variable:
>
> CMAKE_EXE_LINK_DYNAMIC_C_FLAGS "-Wl,-Bstatic"
> That should causes a static link.   For all exe in the project.  As a new
> feature a LINK_STATIC property should be supported in exe targets,
> but this work around should be good enough for 2.4.7.
>
> -Bill
>
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-- 
Ajay Divekar
System Developer
Guardian Technologies International
Tel No : 703-481-4882