[LTP] How to compie a ltp-case into 32-bit on the 64bit system

[Li Wang <liwang@redhat.com>]

Hi all,

I am going to add a new testcase: ltp/testcases/kernel/syscalls/ipc/msgrcv/msgrcv08.c 
for regression test.

But the key point is that this program 'msgrcv08.c' should be compiled into 32-bit, 
if it is compiled as 64-bit application it doesn't work.


So, I try to add one line in the .../ipc/msgrcv/Makefile:

  msgrcv08: CFLAGS+=-m32

and I get some compile errors like:
-----
# make
make -C ../lib -f "/mnt/tests/kernel/distribution/ltp/generic/ltp-full-20150420/testcases/kernel/syscalls/ipc/msgrcv/../lib/Makefile" all
make[1]: Entering directory `/mnt/tests/kernel/distribution/ltp/generic/ltp-full-20150420/testcases/kernel/syscalls/ipc/lib'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/mnt/tests/kernel/distribution/ltp/generic/ltp-full-20150420/testcases/kernel/syscalls/ipc/lib'
gcc -g -O2 -g -O2 -fno-strict-aliasing -pipe -Wall -W -g -O2 -Wold-style-definition -m32 -D_FORTIFY_SOURCE=2 -I/mnt/tests/kernel/distribution/ltp/generic/ltp-full-20150420/testcases/kernel/include -I/mnt/tests/kernel/distribution/ltp/generic/ltp-full-20150420/testcases/kernel/syscalls/ipc/msgrcv/../lib -I../../../../../include -I../../../../../include   -L/mnt/tests/kernel/distribution/ltp/generic/ltp-full-20150420/testcases/kernel/syscalls/ipc/msgrcv/../lib -L../../../../../lib  msgrcv08.c   -lltp -lipc -o msgrcv08
/usr/bin/ld: skipping incompatible ../../../../../lib/libltp.a when searching for -lltp
/usr/bin/ld: cannot find -lltp
/usr/bin/ld: skipping incompatible /mnt/tests/kernel/distribution/ltp/generic/ltp-full-20150420/testcases/kernel/syscalls/ipc/msgrcv/../lib/libipc.a when searching for -lipc
/usr/bin/ld: cannot find -lipc
collect2: error: ld returned 1 exit status
make: *** [msgrcv08] Error 1
-----

these because the libltp.a is 64-bit.


Then, I came up with a idea that I don't include the ltp-lib file in 'msgrcv08.c', 
and just add two lines in the .../ipc/msgrcv/Makefile:

  msgrcv08:
	gcc -g -O2 -Wall -m32 msgrcv08.c -o msgrcv08

It works for me, but I know it's not appropriate for LTP management.

What should I do? or, Is there any good way to solve this problem?

Thanks~

-- 
Regards, 
Li Wang 
Email: liwang@redhat.com 



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