Whitequill Riclo wrote:
> On Wed, Sep 19, 2012 at 9:35 AM, Feuerbacher, Alan <
> [email protected]> wrote:
>
>> William Harrington wrote:
>>
>>> Sometimes you can't build mpfr mpc and gmp within the gcc source tree
>>> for some targets. We found that out in CLFS. That's we we don't build
>>> gmp mpc and mpfr within the tree. Works okay for x86 and x86_64,
>>> however, when you start building for other targets, it becomes hairy.
>>> You may want to try to build gmp mpfr and mpc separately.
>>
>> I've been mostly quietly keeping up with this question on several lists:
>> is it better to build those programs in the source tree or separately?
>> There's a discussion somewhere (on a gcc list?) that comes down strongly on
>> the side of building them in the source tree. It even asks why anyone would
>> want to do it differently. Yet the programs contain instructions for
>> tuning, which requires them to be built separately.
>>
>> During the 1 1/2 years I've been playing around with compiling gcc and all
>> of the LFS programs, I've experimented with building separately many times.
>> No problem building them, but gcc usually fails to find at least one of
>> them.
>>
>> Now, I'm a real newbie when it comes to all this, but if anyone knows why
>> gcc can't seem to find the programs, I'd sure like to know. I'm trying to
>> understand all the ins and outs of everything covered by LFS and a lot more
>> besides.
>>
>> Alan
>>
> I've already succeeded at building gmp, and mpc with in the gcc build
> directory, I need to make mpfr, what do you suggest I do?
>
> Is there a way to just build the following code block;
Needs #include <mpfr.h>
> 1. | int
> 2. | main ()
> 3. | {
> 4. | mpfr_t x; mpfr_init(x) ; mpfr_clear(x);
> 5. |
> 6. | ;
> 7. | return 0;
> 8. | }
>
> and then re-run make?
After lfs is completed, there are the files /usr/lib/libmpfr.{a,so).
How about:
gcc -o xyz xyz.c -lmpfr
Works for me.
$ ldd xyz
linux-gate.so.1 (0xffffe000)
libmpfr.so.4 => /usr/lib/libmpfr.so.4 (0xb7735000)
libc.so.6 => /lib/libc.so.6 (0xb7584000)
libgmp.so.10 => /usr/lib/libgmp.so.10 (0xb751f000)
/lib/ld-linux.so.2 (0xb77a7000)
-- Bruce
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