Re: [LTP] Realtime test failure

["Mitani" <mitani@ryobi.co.jp>]

> -----Original Message-----
> From: Garrett Cooper [mailto:yanegomi@gmail.com]
> Sent: Monday, November 15, 2010 2:20 PM
> To: Mitani
> Cc: ltp-list@lists.sourceforge.net; 當座 健市
> Subject: Re: [LTP] Realtime test failure
> 
> 2010/11/14 Mitani <mitani@ryobi.co.jp>:
> >> -----Original Message-----
> >> From: Garrett Cooper [mailto:yanegomi@gmail.com]
> >> Sent: Monday, November 15, 2010 12:03 PM
> >> To: Mitani
> >> Subject: Re: [LTP] Realtime test failure
> >>
> >> On Sun, Nov 14, 2010 at 6:54 PM, Mitani <mitani@ryobi.co.jp> wrote:
> >> > Hi,
> >> >
> >> > "realtime" build failed in my system with git "ltp-f388d33.tar.gz":
> >> > ------------<RHEL4.8 - x86>
> >> > make[2]: Entering directory
> >> `/home/LTP/ltp-dev-20101112/testcases/realtime'
> >> > make -C lib -f
> >> "/home/LTP/ltp-dev-20101112/testcases/realtime/lib/Makefile"
> >> > all
> >> > make[3]: Entering directory
> >> > `/home/LTP/ltp-dev-20101112/testcases/realtime/lib'
> >> > gcc -g -O2 -g -O2 -fno-strict-aliasing -pipe -Wall -D_GNU_SOURCE
> >> > -I/home/LTP/ltp-dev-20101112/testcases/realtime/lib/../include
> >> > -I../../../include -I../../../include  -c -o librttest.o
> librttest.c
> >> > In file included from librttest.c:43:
> >> >
> >>
> /home/LTP/ltp-dev-20101112/testcases/realtime/lib/../include/librtte
> >> st.h: In
> >> > function `atomic_add':
> >> >
> >>
> /home/LTP/ltp-dev-20101112/testcases/realtime/lib/../include/librtte
> >> st.h:119
> >> > : warning: implicit declaration of function `__sync_add_and_fetch'
> >> > gcc -g -O2 -g -O2 -fno-strict-aliasing -pipe -Wall -D_GNU_SOURCE
> >> > -I/home/LTP/ltp-dev-20101112/testcases/realtime/lib/../include
> >> > -I../../../include -I../../../include  -c -o libstats.o libstats.c
> >> > In file included from libstats.c:47:
> >> >
> >>
> /home/LTP/ltp-dev-20101112/testcases/realtime/lib/../include/librtte
> >> st.h: In
> >> > function `atomic_add':
> >> >
> >>
> /home/LTP/ltp-dev-20101112/testcases/realtime/lib/../include/librtte
> >> st.h:119
> >> > : warning: implicit declaration of function `__sync_add_and_fetch'
> >> > if [ -z "librttest.o libstats.o" ] ; then \
> >> >        echo "Cowardly refusing to create empty archive"; \
> >> >        exit 1; \
> >> > fi
> >> > ar -rc "librealtime.a" librttest.o libstats.o
> >> > ranlib "librealtime.a"
> >> > make[3]: Leaving directory
> >> > `/home/LTP/ltp-dev-20101112/testcases/realtime/lib'
> >> > make[3]: Entering directory
> >> > `/home/LTP/ltp-dev-20101112/testcases/realtime/func'
> >> > make[4]: Entering directory
> >> >
> `/home/LTP/ltp-dev-20101112/testcases/realtime/func/async_handler'
> >> > gcc -g -O2 -g -O2 -fno-strict-aliasing -pipe -Wall -D_GNU_SOURCE
> >> > -I/home/LTP/ltp-dev-20101112/testcases/realtime/include
> >> > -I../../../../include -I../../../../include
> >> > -L/home/LTP/ltp-dev-20101112/testcases/realtime/lib
> >> -L../../../../lib
> >> > async_handler.c   -lrealtime -lpthread -lrt -lm -o async_handler
> >> > In file included from async_handler.c:42:
> >> >
> /home/LTP/ltp-dev-20101112/testcases/realtime/include/librttest.h:
> >> In
> >> > function `atomic_add':
> >> >
> >>
> /home/LTP/ltp-dev-20101112/testcases/realtime/include/librttest.h:11
> >> 9:
> >> > warning: implicit declaration of function `__sync_add_and_fetch'
> >> >
> >>
> /home/LTP/ltp-dev-20101112/testcases/realtime/lib/librealtime.a(libr
> >> ttest.o)
> >> > (.text+0x1a7): In function `create_thread':
> >> >
> >>
> /home/LTP/ltp-dev-20101112/testcases/realtime/lib/../include/librtte
> >> st.h:119
> >> > : undefined reference to `__sync_add_and_fetch'
> >> > collect2: ld returned 1 exit status
> >> > make[4]: *** [async_handler] Error 1
> >> > make[4]: Leaving directory
> >> >
> `/home/LTP/ltp-dev-20101112/testcases/realtime/func/async_handler'
> >> > make[3]: *** [all] Error 2
> >> > make[3]: Leaving directory
> >> > `/home/LTP/ltp-dev-20101112/testcases/realtime/func'
> >> > make[2]: *** [all] Error 2
> >> > make[2]: Leaving directory
> >> `/home/LTP/ltp-dev-20101112/testcases/realtime'
> >> > make[1]: *** [all] Error 2
> >> > make[1]: Leaving directory `/home/LTP/ltp-dev-20101112/testcases'
> >> > make: *** [testcases-all] Error 2
> >> > ------------
> >> >
> >> > "realtime" build failed in:
> >> > ------------
> >> > RHEL4.8 -- x86, x86_64, ia64
> >> > RHEL5.4 -- x86
> >> > ------------
> >> >
> >> > "realtime" build succeeded in:
> >> > ------------
> >> > RHEL5.4 -- x86_64, ia64
> >> > ------------
> >> >
> >> > It is caused by "__sync_add_and_fetch".
> >> >
> >> > In following URL, "__sync_add_and_fetch" is "built-in functions for
> >> > atomic memory access". And It is provided in "gcc":
> >>
> >   http://gcc.gnu.org/onlinedocs/gcc-4.4.0/gcc/Atomic-Builtins.html
> >> >
> >> > There is "__sync_add_and_fetch" in gcc4.1.2 (It is the gcc of RHEL5.1
> >> -
> >> > RHEL5.4).
> >> > And there is not "__sync_add_and_fetch" in gcc3.4.6 (It is the gcc
> of
> >> > RHEL4.8)
> >> >
> >> > In addition, "__sync_add_and_fetch" is for 64 bit environment.
> >> >
> >> >
> >>
> http://stackoverflow.com/questions/130740/link-error-when-compiling-
> >> gcc-atom
> >> > ic-operation-in-32-bit-mode
> >> >
> >> >   http://gcc.gnu.org/wiki/Atomic
> >> >
> >> > Perhaps, the judgment that "realtime" must be built or not depends
> on
> >> > gcc's version (> 4.0) and 64 bits environment, I think.
> >>
> >> Could you please attach your testcases/realtime/config.log and
> >> testcases/realtime/include/realtime_config.h ?
> >> Thanks,
> >> -Garrett
> >
> >
> > I understood.
> > Thank you and sorry for my insufficient information.
> >
> > I attach following files:
> >   - config.log        (RHEL4.8-x86)
> >   - realtime_config.h (RHEL4.8-x86)
> >   - config.log        (RHEL5.5-x86)
> >   - realtime_config.h (RHEL5.5-x86)
> 
>     Could you please try compiling the following C sources in both
> scenarios?
> Thanks,
> -Garrett
> 
> #ifndef _GNU_SOURCE
> #define _GNU_SOURCE
> #endif
> #include <stdlib.h>
> int main(void) {
>         char *c;
>         return __sync_add_and_fetch(c, 1);
> }


I was going to compile the sent source in RHEL4.8/5.5-x86, but failed.

------------<RHEL4.8-x86>
[root@RHEL48-LTP-x86 async_handler]# cat realtime-test.c
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdlib.h>
int main(void) {
        char *c;
        return __sync_add_and_fetch(c, 1); }

[root@RHEL48-LTP-x86 async_handler]# gcc realtime-test.c -o realtime-test
/tmp/cciHVx8b.o(.text+0x25): In function `main':
: undefined reference to `__sync_add_and_fetch'
collect2: ld returned 1 exit status
[root@RHEL48-LTP-x86 async_handler]#
[root@RHEL48-LTP-x86 async_handler]# gcc -g -O2 -g -O2 -fno-strict-aliasing -pipe -Wall -D
_GNU_SOURCE  -I/home/LTP/ltp-dev-20101112/testcases/realtime/include -I../../../../include
 -I../../../../include   -L/home/LTP/ltp-dev-20101112/testcases/realtime/lib -L../../../..
/lib  realtime-test.c   -lrealtime -lpthread -lrt -lm -o realtime-test
realtime-test.c: In function `main':
realtime-test.c:7: warning: implicit declaration of function `__sync_add_and_fetch'
realtime-test.c:6: warning: 'c' might be used uninitialized in this function
/tmp/ccIDckLk.o(.text+0x10): In function `main':
/home/LTP/ltp-dev-20101112/testcases/realtime/func/async_handler/realtime-test.c:7: undefined reference to `__sync_add_and_fetch'
collect2: ld returned 1 exit status
[root@RHEL48-LTP-x86 async_handler]#
------------

------------<RHEL5.5-x86>
[root@RHEL55-LTP-x86 async_handler]# cat realtime-test.c
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdlib.h>
int main(void) {
        char *c;
        return __sync_add_and_fetch(c, 1); }

[root@RHEL55-LTP-x86 async_handler]# gcc realtime-test.c -o realtime-test
/tmp/ccK8hmPs.o: In function `main':
realtime-test.c:(.text+0x20): undefined reference to `__sync_add_and_fetch_1'
collect2: ld returned 1 exit status
[root@RHEL55-LTP-x86 async_handler]# gcc -g -O2 -g -O2 -fno-strict-aliasing -pipe -Wall -D
_GNU_SOURCE  -I/home/LTP/ltp-dev-20101112/testcases/realtime/include -I../../../../include
 -I../../../../include   -L/home/LTP/ltp-dev-20101112/testcases/realtime/lib -L../../../..
/lib  realtime-test.c   -lrealtime -lpthread -lrt -lm -o realtime-test
realtime-test.c: In function 'main':
realtime-test.c:7: warning: 'c' is used uninitialized in this function
/tmp/ccKUnocB.o: In function `main':
/home/LTP/ltp-dev-20101112/testcases/realtime/func/async_handler/realtime-test.c:7: undefined reference to `__sync_add_and_fetch_1'
collect2: ld returned 1 exit status
[root@RHEL55-LTP-x86 async_handler]#
------------


Regards--

-Tomonori Mitani



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