set fPIC option for librt

[Carmelo AMOROSO]

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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