Re: [LTP] [PATCH] fix lib-not-found error when compile for the second time

[Subrata Modak <subrata@linux.vnet.ibm.com>]

On Fri, 2009-12-18 at 06:39 -0500, Caspar Zhang wrote: 
> Hi all, I meet a problem, if I compile and install ltp for the first time,
> ltp can pass the compilation, but if I don't delete installation direcotry
> (originally been /opt/ltp) and try to build ltp for the second time in 
> another ltp source folder, ltp failes in compiling:
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> gcc -g -O2 -g -O2 -fno-strict-aliasing -pipe -Wall
> -I/mnt/tests/kernel/distribution/ltp/20091130/ltp-full-20091130/testcases/kernel/include
> -I/mnt/tests/kernel/distribution/ltp/20091130/ltp-full-20091130/testcases/kernel/controllers/cpuctl/../libcontrollers
> -I../../../../include -I../../../../include
> -L/mnt/tests/kernel/distribution/ltp/20091130/ltp-full-20091130/testcases/kernel/controllers/cpuctl/../libcontrollers
> -L../../../../lib  cpuctl_def_task01.c   -lltp -lm -lcontrollers -o
> cpuctl_def_task01
> cpuctl_def_task01.c: In function ‘main’:
> cpuctl_def_task01.c:90: warning: ‘num_cpus’ may be used uninitialized in
> this function
> cpuctl_def_task01.c:90: warning: ‘test_num’ may be used uninitialized in
> this function
> cpuctl_def_task01.c:94: warning: ‘my_group_num’ may be used
> uninitialized in this function
> /usr/bin/ld: cannot find -lcontrollers
> collect2: ld returned 1 exit status
> make[5]: *** [cpuctl_def_task01] Error 1
> make[5]: Leaving directory
> `/mnt/tests/kernel/distribution/ltp/20091130/ltp-full-20091130/testcases/kernel/controllers/cpuctl'
> make[4]: *** [all] Error 2
> make[4]: Leaving directory
> `/mnt/tests/kernel/distribution/ltp/20091130/ltp-full-20091130/testcases/kernel/controllers'
> make[3]: *** [all] Error 2
> make[3]: Leaving directory
> `/mnt/tests/kernel/distribution/ltp/20091130/ltp-full-20091130/testcases/kernel'
> make[2]: *** [all] Error 2
> make[2]: Leaving directory
> `/mnt/tests/kernel/distribution/ltp/20091130/ltp-full-20091130/testcases'
> make[1]: *** [testcases-all] Error 2
> make[1]: Leaving directory
> `/mnt/tests/kernel/distribution/ltp/20091130/ltp-full-20091130'
> make: *** [build] Error 2
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> After investigating, I find the key to solve the problem:
> 
> Suppose we build ltp to /opt/ltp.
> 
> In testcases/kernel/controllers/Makefile[1] and testcases/network/sctp/Makefile[2], 
> library files which need to be built are defined in /opt/ltp/lib:
> 
> LIB			:= $(DESTDIR)/$(libdir)/libcontrollers.a
> 
> when compiling&linking objects in controllers/ subdirs, the LDFLAGS paths are:
> 
> -L$(topbuilddir)/testcases/kernel/controllers/libcontrollers
> -L../../../../lib (see the error messages above)
> 
> /opt/ltp/lib isn't included in LDFLAGS paths here.
> 
> The first time when you compile ltp, a libcontrollers.a will be generated
> under $(topbuilddir)/testcases/kernel/controllers/libcontrollers, so we can
> find libcontrollers.a in LDFLAGS paths and the compilation could still pass.
> But if you don't delete /opt/ltp and try to build ltp in another source 
> directory, error will occur. Since $(LIB) in Makefile[1] and Makefile[2] 
> are already up-to-date, no libcontrollers.a will be generated in 
> $(topbuilddir)/testcases/kernel/controllers/libcontrollers due to makefile
> policy. Thus, ltp can't find libcontrollers.a in LDFLAGS paths.
> 
> So we can fix this problem in two ways: add $(DESTDIR)/$(libdir)/lib to 
> LDFLAGS or change $(LIB) paths in Makefile[1] and Makefile[2]. Find details
> in my attachments.

Thanks. I too faced the same thing sometime back. Garret, please apply
the solution you would like the most.

Caspar,

There was also a problem with the sctp library. Did you check that out ?

Regards--
Subrata

> 
> Thanks,
> Caspar
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