set fPIC option for librt
Hello ppl,
I am totally new to uClibc. I did search for my problem in the archives
but could not really find a solution.
My problem:
I wrote a simple program :
#include time.h
#include stdio.h
int main()
{
timer_t tid;
if(timer_create(CLOCK_REALTIME, NULL, tid) == 0)
printf(timer created\n);
else
printf(timer create failed\n);
timer_delete(tid);
return 0;
}
I cross compiled it with:
arm_v6_be_uclibc-gcc timerUse.c -lrt
and ran the resultant a.out on a monta vista box
I got an error saying something to the effect of Can't modify text
section. Use GCC option -fPIC for shared objects, please.
I looked into the config files and echo-ed out stuff in the makefiles
(esp Makefile.in in uClibc/librt) only to find out the CC variable is
set to arm_v6_be_uclibc-gcc only. Using this compile the os files are
created.
I hardcoded CC:= arm_v6_be_uclibc-gcc -fPIC
and then re-compiled uClibc and the program as well and it ran perfectly
well.
Now how and where do i make the config files to have fPIC set for the
cross compiler??
All help appreciated.
cheers
- Ben.
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Re: set fPIC option for librt
On Thu, Sep 11, 2008 at 07:32:09PM +0800, JACOB BENJAMIN-VGH684 wrote:
Hello ppl,
and ran the resultant a.out on a monta vista box
I got an error saying something to the effect of Can't modify text
section. Use GCC option -fPIC for shared objects, please.
I looked into the config files and echo-ed out stuff in the makefiles
(esp Makefile.in in uClibc/librt) only to find out the CC variable is
set to arm_v6_be_uclibc-gcc only. Using this compile the os files are
created.
I hardcoded CC:= arm_v6_be_uclibc-gcc -fPIC
and then re-compiled uClibc and the program as well and it ran perfectly
well.
Now how and where do i make the config files to have fPIC set for the
cross compiler??
I was under the impression that we already use pic for the shared
objects, but ok.
$ grep FLAGS .config
UCLIBC_EXTRA_CFLAGS=
i.e. run 'make menuconfig'
go to the uClibc development/debugging options menu and set the
Enter any extra CFLAGS to use to build uClibc according to your needs.
Of course you can pass UCLIBC_EXTRA_{C,LD}FLAGS down via make if you do
not want or need to keep them in your .config.
Just as a sidenote, you should not hardcode anything in any makefile,
that's what .config is for, or a wrapper-script that passes down the
desired flags, if you really need (you shouldn't).
All help appreciated.
HTH,
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Re: set fPIC option for librt
Bernhard Reutner-Fischer wrote:
On Thu, Sep 11, 2008 at 07:32:09PM +0800, JACOB BENJAMIN-VGH684 wrote:
Hello ppl,
and ran the resultant a.out on a monta vista box
I got an error saying something to the effect of Can't modify text
section. Use GCC option -fPIC for shared objects, please.
I looked into the config files and echo-ed out stuff in the makefiles
(esp Makefile.in in uClibc/librt) only to find out the CC variable is
set to arm_v6_be_uclibc-gcc only. Using this compile the os files are
created.
I hardcoded CC:= arm_v6_be_uclibc-gcc -fPIC
and then re-compiled uClibc and the program as well and it ran perfectly
well.
Now how and where do i make the config files to have fPIC set for the
cross compiler??
I was under the impression that we already use pic for the shared
objects, but ok.
Yes, exactly. I do think that there is some bogus asm code that is not
PIC, and FORCE_SHAREBLAE_TEXT_SEGMENT is set so linker refuses loading
non pic libraries.
Carmelo
$ grep FLAGS .config
UCLIBC_EXTRA_CFLAGS=
i.e. run 'make menuconfig'
go to the uClibc development/debugging options menu and set the
Enter any extra CFLAGS to use to build uClibc according to your needs.
Of course you can pass UCLIBC_EXTRA_{C,LD}FLAGS down via make if you do
not want or need to keep them in your .config.
Just as a sidenote, you should not hardcode anything in any makefile,
that's what .config is for, or a wrapper-script that passes down the
desired flags, if you really need (you shouldn't).
All help appreciated.
HTH,
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Re: set fPIC option for librt
On Thu, Sep 11, 2008 at 02:13:07PM +0200, Carmelo AMOROSO wrote: Bernhard Reutner-Fischer wrote: On Thu, Sep 11, 2008 at 07:32:09PM +0800, JACOB BENJAMIN-VGH684 wrote: Now how and where do i make the config files to have fPIC set for the cross compiler?? I was under the impression that we already use pic for the shared objects, but ok. Yes, exactly. I do think that there is some bogus asm code that is not PIC, and FORCE_SHAREBLAE_TEXT_SEGMENT is set so linker refuses loading non pic libraries. Perhaps you can pinpoint these spots, Jacob. thanks, ___ uClibc mailing list uClibc@uclibc.org http://busybox.net/cgi-bin/mailman/listinfo/uclibc
Re: set fPIC option for librt
On (11/09/08 19:32), JACOB BENJAMIN-VGH684 wrote:
Hello ppl,
I am totally new to uClibc. I did search for my problem in the archives
but could not really find a solution.
My problem:
I wrote a simple program :
#include time.h
#include stdio.h
int main()
{
timer_t tid;
if(timer_create(CLOCK_REALTIME, NULL, tid) == 0)
printf(timer created\n);
else
printf(timer create failed\n);
timer_delete(tid);
return 0;
}
I cross compiled it with:
arm_v6_be_uclibc-gcc timerUse.c -lrt
and ran the resultant a.out on a monta vista box
I got an error saying something to the effect of Can't modify text
section. Use GCC option -fPIC for shared objects, please.
This means that there are TEXTRELS in the shared libraries, uclibc rejects it
by default. If you have FORCE_SHAREABLE_TEXT_SEGMENTS set in your .config then
unset it and recompile uclibc and see if it works.
-Khem
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