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, Caspar
lib-not-found-compile-err.patch
Description: Binary data
lib-not-found-compile-err2.patch
Description: Binary data
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